Science 7

Chapter 3

Directions : Look and complete the picture with the words: solid, liquid or gas.

Brain Teasers
What is the most abundant element in the universe?

100 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

What is matter? Atoms Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning

proton parPtiocsleitively charged

neutron Neutral particle

electron parNticelgeatively charged
nucleus acnodnCtnoaerieuntironofgnsapnroattoomns,
subatomic an Samtoamller in size than

SCIENCE LEARNERS MATERIALS GRADE 7 101

Chapter 3

Hands On!

Atoms
getMaxakatseMrteetseamsrut.tepienlryscipssluamadcnaeeyls.lthApaialnlllrmgtsicatohltletaiedstrshci,saalsmilqlemauddaidaesstsouaampnnosdd.f

Quick experiment :

Sharpen your pencil and “draw” a very small dot in this box.

1) How many atoms of pencil lead can you see?
A) 4 atoms B) 40,000 atoms C) 4,000,000 atoms D) 4,000,000,000 atoms

2) How do you say the number?
A) Thousand B) Million C) Billion D) Trillion

Exercise

Directions : Circle the correct term.
ttmhoaalAotttoetwokremaasnnt edtahereeadmrteah.nesoebluelaiclrdtgrineogn/ blocks of all
mhiucgroes/cotipney

Directions :(CUosme p2lewtoertdhse,2osneenitsewncroensgb)elow with: wavelength / visible / nuclear.
1) A light microscope uses__________________ light to magnify the object.
2) An electron microscope uses electron ______________ to magnify the object.

102 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Hands On!

ovpoetbnhorlfuuaeablzrcuAATApctitztilmhtnrtciaenrnoeaolreueategetrrhnoustsoeiotsentnc.,hur.moacsaenaTcnlardnlisheaeselhulendeantmahn3tdtdseoe.npaErmsasdurnnouvbuecoeutebibooslfucuenauanltpetuettrssthomootusoo,ehmnmsf…pnei,seiastecisy.lcvtiumakoepmEstmepromnaploaesarepasnttdcrimcilmsctaosteierlcnfaaeao.ttlelsusnhhlenets.pdeesssr.
tptmpbobeahhflrruaeeeaeeoptcrHNEETcmkyttaaorittaaheceehorrunhcciorlesuretnesesoaahnhtsernnnakhvwsmopsigauetaailnethoroactevros(ohameugnel+dstemavsoaros)swauaeesinrnesaemapchatawshnhyshotiasnsaoidhenstasteomshoeoeiprputefrologgiaailovtrlcsuereaenobestsa.mvtchttiomilotceeav,teiuaarvnhneaqtwotsnesalunss1lhagcylrywsautgilhrucoalalc,ibeacn(htmm-hhenrhibaa)tgimuxauas(nuntweap.orrm.dteggmihrmtaaeb.etetinuhchnsedisd)ceehssr.,,

SCIENCE LEARNERS MATERIALS GRADE 7 103

Chapter 3

Exercise

DeqirueAacnlti/oenhlesecat:rvCoienirrchtlheaastnh1ea/1cp8or4or0rteocantmoteurr.nmTehuetrroenfo. re, an electron is very much lighter /

Directions : Ucosrerethcet iifnnfoercmeastsioanrya.bove to complete the diagram and table below.
Check and

shell

A1th.e6uA6nm0tiot5am3sos8fic9mo2fma1osanxsse1se0Cqu-(2uan7aritblkot(goan.m)e1xu2a; cadttlayolmt1o,/n1o)2r:
proITttohinsistoihsretohbneaeasnpisepuortofrxoaintmo.matiecmwaesigshotsf o. ne

Research and draw a hydrogen atom and label the subatomic particles .

Brain Teasers
Which has maximum number of atoms?

104 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

What is matter? Atoms Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning
element ssaboiccnoainunrmtnnoeebdesnpkartsolhciectettauhunorabernnonneesddftvucsrcomebeephowrsdoefsrttrnmmeiaem(dnia1tctihctahn1ateaeoar8tllrnoyysr).t
mbhuyamtedhxaeeinsetkoinninrvgdirci.onanoumrsceeandut;snbeodyt
natural wtchhaarostsoeuumra,gbafhpisirx,oteaoaudntnsdccsnihueitetcromihtghioceaananst.l
subpsutarence

abundance somaeltahrignge amount of

compound tceohlefetommwrmieocnamltlasyottcertorhmamtbionaerrdee

SCIENCE LEARNERS MATERIALS GRADE 7 105

Chapter 3

Hands On!

Elements
caoahwotaxnrehoysdrciEPEFmtcgha6oualnheseeirrncpe,nemmcuhpreaonfgiteuxrcrtnuoaoaorona’memtltmnndtlosibssbprmpoi,.oeserlxabonermyboruc,fgeorrtfeaaooefasdamkpnsphecenueraea1nuosrtlr0eipeot.buuo0lmempoOn%smnssNbua,iearyb(tLoo1ennYspnml2dtetho)aachshyftnatooaasgrctomissooocennml2asdass.,.l
• How many protons does iron have? ______________
• What is the symbol for iron? ____________________
• How many protons does gold have? _____________
• What is the symbol for gold? ___________________

oCfuLpSaorutminmew)o=oftrhsdeysms, ysbmuocblhoClasusu:sCeaobpbpreerv(iaLtaiotinns:
aofs:lMehtoytedsrtrsougfsreoenmthHteh, eofiirrrszEti,nnocgrlZiasnhcnoammbeinsauticohn
samSeomtyepeeletomfeonrtms cmoomlebcinueleast.oms of the
hoyf d2OHrooyxxdgyygreogengenanegtnoaamtsgo,samfsosr,Heh2xeainsmcpmeleathdiesemnuaapmdeeofuOp22

106 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Exercise

DAnosywoeur:k_n_o_w__h_o_w__m__a_n_y__o_x_y_g_e_n__a_to_m__s__o_z_o_n_e__c_o_n_t_a_in_s_?__T_h_e__s_y_m_b__o_l _is__O_3
maIfroethlemecrauenleaysrce(oH2m2obOrin)macotoironenssdisioftffeodrfeif2nfethreyedlnertmoegeleenmntseainnntdsmt1ahtaotetxmrygwaeeknecauatplol iEmtVaEcRoYmTpHoINunGd..WThaetreer
WAnhsawt eisr: c_a_r_b_o_n__d_i_o_x_id_e__m__a_d_e__u_p__o_f?__T_h_e__s_y_m__b_o_l_i_s_C__O_2_______________
Read, think and write.

18% 100% 65% 10%

• _T_h_e_m__o_s_t_a_boufnydoaunrtmealesms.ent in your body is oxygen, which makes up around
• _T_h_e__th__ir_d__moof syot uerlemmaesnst in your body is hydrogen and makes up around
• _T_h_e_n__th_e__re_ oisf ycoaurbr omna,stsh.e second most abundant element which makes up

Earth elements
acrbuuTsnht.deapniceecohfaretleomn ethnets leinft tshheoewasrtthh’es
At this time, we know of 118 elements.
butMsoosmteofartheemseadeeleimn eanlatsbaorreatonrayt.ural,
symEbaoclh. element has a name and a

SCIENCE LEARNERS MATERIALS GRADE 7 107

Chapter 3

Look at the periodic table and answer the questions.
• The elements in the periodic table can be classified into _______ main groups.
• Most of the elements are _____________________.
• Some are __________________________________, for example oxygen.
• A few are ______________________, for example silicone.

lTahbeorreataorrey.aTlhsoe psoemrioedeicletmabelnetsditvhidateswethree eolnelmy erenctsenatllsyodinistcoogvreoruepdsoarnmdapdeerioindsa.
• A vertical column is called a group. There are ____________ groups.
• A horizontal column is called a period. There are ________ periods.
• The elements in group 1 are all metals, except ________________.

Look at the element on the right.
• What is its atomic mass? ____________________
• What’s its proton number? ___________________
• What’s its name? _________________________
• What is the symbol? ______________________

Brain Teasers Who am I?

P,eMopyleatuosmeicmneutmobkeereips tehvinilgifsohnotthoerrcigohldt ,dYaoyu, Iccaannsrheacpycelemienitnhteo raignhytmwoauyl.d

108 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Metals, Nonmetals and Metalloids Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning

metal amecisnoletadnyacldpltdsreuiicoucacalcaitbdlitllviyllimeaethy,n,aawdtrfediuttrh,hisasegilhrbotmihnloeaayd,,tl

nonmetal msuebatsantla. nceelethmateisntnotoar

metalloid batasaiennrersm)dteawewisnnecoiehioclnenoin,dlsttdehaeneuomnorcsptnmetiemormnooeroseftpdmn.tea(yierela,tst.iaetgoolessrr.

temrpoeormature fD2tre0oimcmTt°pihCo1een,5raaO°(rtbCuyxufrsoetttoramdist2eaEa5synr°orCgovul)aoinsrmdhy

conductor atmhnreodAtuagelm,hletahectaaetrstriicillayeit.lty,sophfateesanst

SCIENCE LEARNERS MATERIALS GRADE 7 109

Chapter 3

Hands On! • Mofehtaelastaarnedgoeoledc/trpicoitoyr.conductors
• Wwoenc’tabnrcehaaknagsetthheeyiraforermmaanlldeathbeley
Metals, Non-metals and Metalloids • We can also pull them into wires
Read, choose and circle. Check and they won’t break, as they are
and correct if necessary. ductile
• /rMoleootwmalsmteeamlrtepinegsroaaltinuddre/baloiqniludinidghap/vogeianhstsig.aht

*Mercury is a metal that is liquid at room
temperature. You can find it in analog thermometers.

• Metals are usually shiny / dull.

Label the pictures below with the words
shiny, malleable and ductile. Check
and correct.

Choose and circle the correct terms
• Agat sthteurmnselttoinga point a solid / liquid /
solid/ liquid / gas
• Agat sthteurbnosiltiongapsooilnidt/aliqsouliidd / liquid /
/ gas
• /Agtatshetufrrneseztoinag point a solid / liquid
solid/ liquid / gas

110 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Read, choose and circle. Check and • Nsuorfna-cmee. tals have a shiny /dull
correct if necessary.
• Nlmiqoeunltii-dnmsgeaotanr dlsgbacosaielnisngewxpitiohsitnhtasigshso/ lildosw, • Tmphreeeasysnusarrete.hebyritbtlreea/keelaasstiilcy, uwnhdicehr
• Hydrogen, helium and nitrogen are • oNrohne-mate,tealxscdeopnt octacrboonnduct electricity
non-metals that are solids / liquids • Nvdeeornnys-mhityeeatwavyhls.icahremuesaunasllytohfehyigahre/ low
/ gases not
• Cexaarmbopnle,sioofdninone-manedtalssuinlpthheursoalirde/
liquid / gas state
• mBreotmalininethise an example of a sntaotne-
solid/ liquid / gas sulphur

Read, choose and circle. Check and
correct if necessary.
• nMoettamllaolildesa,blliekeor/duuncltiiklee. metals are
• Athteyloawreer p/oohrigchoenrdutecmtoprseroaftuhreeast

aconndduecletivcittryicatithyi,ghbeurtteimncpreeraastuereisn.

SCIENCE LEARNERS MATERIALS GRADE 7 111

Chapter 1

• Topfhrotehpseeerntioeenlse-mmofeemtnatelsst.ahlsavaendaallll / some
/ some

• bThuet yaraepmpeaaller asbhlieny/ / dull like metals,
brittle.
• Msamrilsoeiecstantolincl/o.,iodgnsel.yrmSaoamnfeieuwmeex,laebmmoperolnentss aaanrrdee

Exercise

cwDoiitmrheptchlteeioteninsftoh:reTmetaaabtmiolenwcpoorrrokrveFicdoterlymdi.saStghhoreowuwpyinoonufer3rw.oorr4k stotutdheenttesaacnhderc.oTmheplfeirtset tghreoutapbtloe

Properties Metals Non-metals Metalloids

Appearance
(dull/shiny)

Malleable and
ductile?
(Yes / No)

Melting and boiling
points

(High / Low)
Conductivity of heat

and electricity
(Good / Poor)

Brain Teasers
Thgeivsee tthheinmgsa agroeomd asdhaekoef. mTheetaln.oYisoeutmhaigt hthtehyamveakloetsisoar jjiunsgtlea. sWinhgaltea. mIf yI?ou

112 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 1

Radioactive Elements Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning
unstable stuabahtnntirneoIodsndmtnnatishgnsuboegcleaemnlnree.ueeouncusesalgerattghiooidoymgtfoeittssohthhetnoebhsolrdeee,t

radioactive pwtorirolblateoldocnsiosoemaansceetthsiuvtetaeryobanlaetst.teoammnpdst

raddieocaacytive rtheepacerhraiodadiosatoacfbtitlveimeseatatuogmnet.sil

shyamzabrodl shwowarsndinagngseirgn that

radiation rpdeealeecrnaatesiyrecgdlyedasunridnt hgcanhtuacrgaleerader

SCIENCE LEARNERS MATERIALS GRADE 7 113

Chapter 3

Hands On! ethleempreontotsn.s and neutrons, forming new
sernatenadDeubitraulrgetoriyonsinntsaagntaiesdntirdhsceehrlpeearaaporcgstroeheondedcsd,ep,wastarhhseraitciticonhmlfebcesdaoaulennantcsnatactiilhnyeaes.,
Radioactive elements
iensleeEwumlneeesmlnetatemsbn.etlsen,tthsa,arbtebercceaaaulklsededothwreanidrainonudaccfloteirvumes There are 3 forms of radiation:
nacaTttiunhrgaelolynnuwitc.itlheouust awniyll oburtseiadek fdoorcwens

This process will, over time, reduce

Alpha Radiation:
caestlhtoetarPpcartapgcrrieteceeddndfitbeabynlldpyua.hcnapTleeihepguecasasertetilvioocpefsleapecrsawthipcaahelriecrgp.sheoscswaitiinnilvl ebbaleney

Beta radiation:
caepbhtleyetanrPacareangtctrrrteaieaecdlntudetmfbnidbeieuenylctdeualpp.mepeuoTsrssah,hirgtbeteiivisucveeetelte.cscpawohnauahrbtritcgniecheeslgestwoasipitnlilpvcebeaaldneny
Gamma radiation:
bippomoTshryearoninrcTnssctoeihhtecottfaigmlrosanearargfc,atmpotiebrtniraevesmugrerotttaieialfpocrynalforlsdebatrcwha,dtalhreeodinaitararcidvawrtaskgeitiouiollowelsnfcnnfdnaiialncoyivcsniateaaeansb.nnsroettteBitlrhptyadpeai.eciicotugsntksarcheainutltetecioslrviataneteeidtteldeaisyt,.

114 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Think and circle. Then check and • tsrwChaahaedfeenirntoceyaeswmucrolettraikavonisenfdugthrsemweussibutemhtsaputstasrliioongt cnbhcetseelsysfsco,/ealhlssonitgwarhbinecldedyt
correct. / ignored.
• ahmbtShenoeaeldmpdsriepenatoglodarrfain/ealdehtdtsaiaioodrainanml/ickifcsntreiaopvg.rmeedhcbueoiemaleaslarmcdncaesotpon,niatnptsnagreiimmnvaeeuanrnsldsstt
• acaRfTteohlenalwoterddrtwyeauioasisacnaetlaucscosnstoabiivbtnnjoeececmtcaeeeuterlrlsselbde/hmaiodcCoreniewonan.vesdtasidtaatrthantr1aiacdn9vcegietnprisvdmaw,eutuaihes/snitnocerytlydhds/.
• rvEcbpaehoevdradenynineyoug,tarssebaceostefet,uciinvlrayae/yuohdosuaeiuerarlrmettbiDhomfoueNndelArytnraoet/daslteIhinaQaedmt.isohaecnuydamcubbaaseenny

Carbon dating

Radioactive waste

SCIENCE LEARNERS MATERIALS GRADE 7 115

Chapter 3

fatwlmohrnoeneadmWgtraeaeterrhdmreiaiaipsaalersetnenix,orypaieno(toxosudlepsorr)evaouewedlsrlcleeersaetdvoamdsart,iheaotaesiyttgndiouobahocntllehyeuhcivrisgraoaeahsmlnldsr,oaeoioordourmsavirwiaccaehsttkliri.uoev.nIneanf

Exercise

Directions : Answer these questions.
1. What are the three forms of radiation?
2. What charge does a beta particle have?
3. What charge is an alpha particle attracted to in an electric field?
4. Name at least 2 sources of natural radiation.
5. Name at least 2 uses of radioactive materials
6. Name at least 2 radioactive elements
7. What happens during radioactive decay?

Brain Teasers
This atomleisssathNaonbl1e6G. Iatsa.lsItohliagshatsnuaptoinmtichenunmigbhtesrkthyaint isLagsreVaetgear sth.an 5 but

116 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Properties of matter Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning
prompaetrtetyr of vmitspmdcneuoeaocopamcinnlrnlrluehlsoutepd,.ipbtmaeehayeeb,asrreatiraclind,emiatotynsynuleeo,tlrorasroeeamf,ssbin,,mtmuejsogelraaatdctetithsnnotthdeas'dgrsr,,,,t

freezing point awhsthiocelhidtaemliqpueidrattuurrnes atot

size obhjeocwt isbig a certain

hardness hcaotrnhdd.eitioqnu aolfi tbyeinogr
mass bgaurhactovenwitroytt.ahdieneapvoeybn, jdoeirncgtligiohsn,t

SCIENCE LEARNERS MATERIALS GRADE 7 117

Chapter 3

Hands On! Example property of matter : Brittle
rbartoDhkeeerfnitn.hiMatinoantbtee:rntRhdaisgt.ibdrebaukts vweitrhy aesansailpy
Properties of Matter athneEdrexafbomrreepa,lekitsieseanbstreiiltnytlceeu. n:dGelarspsrweisllssunraep;
tptooroTydpoheeuers,tccioehrrsiay.broaeFucormtreteeraaiastmectichr:isawltsohradatraaersesciagulnsleeeddd
othfa1mt)eaUxttpseelra.ainOdsircthutiesoencahyraoyrutaorcwotewrirtinestawicdoienrdfitnesi!rt!mions Example picture:
sub2s)taWncrietethaat hsaesnttheant cperopaebrtoyu. t a
de3moInncstlruadteethaepcihcatruarcetetrhisatitc.would

Team Activity

Directions : pCrheosoesnet yaowurofridndfoinrgysotuoothreyocularstse.am and research it online. Then

Ductility Elasticity Lustre Magnetism

Malleability Odour Rigidity Shape

Solubility State Strength Taste

Texture Viscosity Volume

If you can, make a short PowerPoint presentation.
Slide 1 the word, Slide 2 definition,Slide 3 example sentence and picture.

118 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

DSSirtteeecppti21o::nWyaWsosr:huiatMarentaatPenhtcrxseohawpnmteehurpremstly.epb.oreofrpMneearxtttiteetsroAthmeIa?pCphrooposrieataenpdicctiurcrele. .OCnheeicskdaonnde correct
for you

1. Capable of being hammered or pressed or formed into various shapes without breaking.
A) Malleability C) Hardness
B) Ductility D) Odour

2. When a substance can dissolve or be dissolved easily.
A) Texture C) Viscosity
B) State D) Solubility

3. The temperature at which water turns to vapor.
A) Freezing point C) Magnetism
B) Boiling point D) Taste

4. When matter is sticky; thick like glue or syrup.
A) Hardness C) Volume
B) Viscosity D) Strength

5. When matter has a bright shine on the surface.
A) Lestre C) Lostre
B) Listre D) Lustre

6. When matter is stiff or firm; not able to bend.
A) Rigidity C) Radioactivity
B) Elasticity D) Mass or volume

7. When matter such as metal can be molded or shaped, or drawn out into wires without
breaking
A) Ductility C) Tucdility
B) Cutdility D) Tudcility

SCIENCE LEARNERS MATERIALS GRADE 7 119

Chapter 3

Compounds and Mixtures Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning
compound
meoclreaoomnlmmeeyocnptrusesol.euscsbehsoedtfma nitcwcoaeofl
mixture nmsduoiaafbtdfcmseehtiarexuentmpucnrioectefsaitsclwlwyahohbemoiocmranhmtdiecaoeriradraee.ll
rrtcbsuaeemonokaapmieanctlrgtdpplieeooraoesonsfrutdt.uenaifpnundtnatcooidtchgnfhaheagemaemttmtehoictnicemchataaarens,lll
molecule qsmiuzothaereenbttihreteyitnl,wagaetsimeonnosuthwnitop, ooinrr
acipnhrtmmooediemtxwutthiucocortaoedmrl otmsihrxuaotsubtroecrsleuodtatniisnovtceninreoctsstf
ratio
separate

120 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Hands On! • Tish2e:1ra/ti3o:2of the molecules in water
• Tfohremaatonmeswcsoumbbstinaencoer t“hbaotnisd”thtoe
Compounds sbseauleembmbseretoanakntsescn./eddiafofnewdrnewninthtfoircoihmtsctcahonenos/triitcguaiennna’ttl
Read the text, think and circle the • Awlhl icwhatemremanoslecthualetswaarteersihmaislara,
correct words. Check and correct your random / fixed composition.
work.
• ctsCwuooobmmsobtparinonmeucdonersdbeisotshlotaaegtrmeicasarpell/uyfreo/elrecmmh/eeedminmtiwcspahualelrrynee.
• iTshceasllmedallaesmt polaerctiucllee i/nmaiccroomscpoopuen.d
• Water is a compound that is made
uoxpygoefnh/yidrornogeelenme/ nntsit.rogen and

Ionic Bonds Choose and circle.
• Itdbcedetnhhalliyofoaeeafcntetscnhhopareteeitratoohoneatrnteotnthstiitreccertalsiaaehrbpc.ptnceoaotAetintmroebenodnp.londi,enobenoIscnlaegndatntmearerowotdiabtiooevhntosneioetantyinmrtctdoovoowbeampfiososslup.instrteadfoesdAosbssnrthi,tmftiotriilaeamtiomehzvllmyldeeeeys- ChlSooridnieumis aismaemtael t/anl o/nnmoentmaletal and
charged ions. (positive and negative)
• pFdfabtdaonoiorisbrfodrnmfslpeedoederacxeewsrniatatnaiieemlilttlotces.fnpeto,Yiilanrlceiemonnt,obcuciwsotloiurcoonnhodanddiencinsni,nuecgtipmogntowraammweoatdaiaptnvaeitkocdietnteoutyrd.mncNaedhvnsanalbCochiloryyulai,ndeviottioeecssr

SCIENCE LEARNERS MATERIALS GRADE 7 121

Chapter 3

Covalent Bonds Choose and circle.
• vbeteOcIonqoaloe3vbuulacu)aane,telcldrelcoysoanblnovbtlyaetasebhgrelsteoeow.hannuIaetftditregvhte,bhinhetdtoyehtnheesievednlaleaee,amcllcueptttohtrecerromeotsanrn(socasejnu.fitts.ooiesIgcnrmgstm.ehaa,sniatnetiHtrvargheeui2rtddeeeay, annodnHmynedotrnaomlg.eetnacl aanndacotxaysgBenOTisHa, ammeteatla/l
dinitsoAsoiloslvnoes,.icnowvaatleern, tbuctodmopno'tudnisdssocmiaatey

tpcbtpwibsoooerooaevmabtnltwdaaenedoelriroec.r,netentchoFnHteonaoab2trpvtwr,oOtcaorofneaoo,lladxcenvrarma,tnao.ertmntleihUdenmepbnsghtnuletooeeaattnb,alholdpldloeyntlihon,scetbloeda.aoaganrnYtatweocodetotmioomhlluielvmssecaf.trscsothlraerabaoimnidnnnnyt

122 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Molecule, Compound or both?
• Look, think and write your answers in the boxes. Check and correct if necessary.

Which elements are present in these • etUhlseisemutehnneittspto.ehrieoldpicyotaubfliendatththeeceonrrdeocft
compounds?
• Linotookthaendtawbrleite. the missing elements

Compound Elements contained Formula

Salt Sodium (Na) and Chlorine(Cl) NaCl

Carbon dioxide CO2
Water H2O
MgO
Magnesium oxide

Rust Fe2O3
Copper(II) sulphate CuSO4

Mixtures

Read the text, think and circle the • bAobCtchhfeuiOerettHw2/cmt2WehomiOecemaonartpemleleto/rhcoinpsefuloeehslrnencyeesotsuscixlca.eofaiansxmmld,ebppOdNoole2nn2cdeiosmmnsmaotobspllm.eeeoctciswxuuitetlluieeoerssnne,,
correct words. Check and correct your
work.
• MBcthherixeectmeuarioucersasmellcyooor/nefpshctihsyotsimsioc,pfaotlanhlyteenlcreteosamstahtbrateintweaondreo./

SCIENCE LEARNERS MATERIALS GRADE 7 123

Chapter 3

•• ehmIpWfxruohoatmlhbemeelanceprunmeltelsehs,saetahhrcneeewoadrneelretiaanaastigrnnsheeie/mmOdbr aor2inierlsesatmhtHhhwiosu2inlimmOelglcii/xdhuCtauleOfrvoes2er,. •• s/bLcAeaurvaesyrcabestsphhetneaoeal’ptlrslctaicahzofthraiielmoaettrnitmoappe.ntdoiiicconatanbeunl,ylnrdycetspbrseyhoivsnwynatasadpitileohclmizdraaiaflxtittlhtimitouoreanrneye.taaicoannarnsdne,,

Read, choose and write: Compound or Mixture ________________________________________________________________________________________
48761253........ CCIEIIIEttttaloohhhhecmmaaamahssssppecooafvnnioxannotfsmereeixifdaannipexbrttoedmsselndeeacccelracomotneinommnte’mcgctplbtoibapoinamnneosgneibsdtbsdiaiioeteninbconpedsohnadeielbripapnmoathgieilrcyidanpsatgoieplcliydhnpaytolpslsyihnicytsaslilcyally

A cthoesmeipcaa.clroaremteapcootriuocnnhdaisnngeeeaded

CMoixmtuproeus:n_d_s_:____C__a___n___y__o__u____n__a__m___e____2___c__o__m____p__o__u___n__d__s___a___n__d___2____m___i_x__t_u__r_es?

124 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

Compounds and Mixtures Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai Meaning
beaker lhiwainqoiladuildpelicdainfmusobgp.oroauoprntroahdgutamolraninresdigsaeu,swssuuuirstaifhenollgdayr
Bbuunrnseern
tttuhypebgeiabcswoabtlitltuyohrmnsomefraaclol shntosraliesitsginhagtt

tripod stand pbsuelaaapktpfetoohrsrrrtmefela-uslsekesgdgaentddo
retort stand egosuqlfaapuseippspqowimeruacterienopettomhinfeetserncnptideieenacdtineftidocs
filter funnel otushofsealfeiidlldatlesabrbffoionrorograrmatsotoerliyrqpypuarifrdouascnteinvnseigasl

SCIENCE LEARNERS MATERIALS GRADE 7 125

Chapter 3

Unit Review Date: …./.…/….....

Directions : Choose the words from the word bank to fill the blanks.

metalloids periodic gamma stable substances
atoms cancer mixtures alpha metals

1. __________________ are the most basic building blocks of all matter.

a t2h.i c_k_b__lo_c_k__o_f_le__a_d_c__a_n_srtaodpiaitt.ion has such a high penetrating power that only

ra3d.i atBioentaarraedpiaotsioitnivealryecnheagrgateivdeplyacrthicalergse. d particles and __________________

pr4o.d uRcatidoino.active elements are used in _____________ treatments and energy

by5p. h_y_s_ic__a_l_m_e__a_n_s_._____ do not have a fixed composition and can be separated

6. __________________ have high boiling and melting points.

(c7o.m bCionmedp)ounds are pure ___________________ that are chemically bonded

is98c..a l_Tle_hd_e_tnh_a_e_m__e___s___o__f__e__l_e___m__e___n__tsh_a_a_vn_ed_potratohbpeleer .rintifeosrmofabtioonthc, amnebtaelsfoaunnddnoonnamcehtaalrst.that

__1_0_._ R_a__d_io_a_c__ti_v_e_e_l.ements release radiation to become elements that are more

126 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

T ry t011o-911d--012o82cthccoeoorrrrcerrreecocct:sttsr::ewgyvoooieuordwCda.rrtwoCehsoeaasrnnkwu!nyoEoirtXduPsTEoiRmlvTee!.it?

SCIENCE LEARNERS MATERIALS GRADE 7 127

Chapter 3

Unit Review Date: …./.…/….....

Part 2 Practical Test (a summary of knowledge after practice)

Compounds and mixtures

Picture Detail

1. Students are divided into groups
of 4 students. The teacher will show
flashcards of different compounds and
mixtures.

Students will get points for answering
correctly.

Teacher tallies points on board

2. Students are then asked to name
the components of the compounds
or mixtures by writing a chemical
formula (naming the elements) or the
constituent parts (for example sugar
water consists of sugar and water)
either by coming to the board or as a
writing task where the first team to write
and show the answer correctly gets the
point.

128 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 3

SCIENCE LEARNERS MATERIALS GRADE 7 129

Chapter 4 SCulabsssifticaatnionceofs

Changes in Substances
Pure Substances and Mixtures

Chapter 4

SCIENCE LEARNERS MATERIALS GRADE 7 131

Chapter 4

4.1 Classification of substances. Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai meaning
Colloid
apnaAdrtisacurleebssntdoatonecnaeostiwlsyhefeitlttrleeereothdue.t

Homogeneous tthhrAeousmgahimoxuteut.rceomthpaotsihtioans

Heterogeneous athmrAooumugnihxttosuuroet.fwsiuthbdstifafenrceenst

Mixture sacfheruehiotAvbtehemasmerrtoirasaigtcnuwbaeacblnoeelhlessyoor,otaumacrwtsoinoohmsmcg.iucoeebIbhtrnisnecaotmaearuenpdnasc,undebrooi.eeenrt

Solution sbomureiAxabstscuotolrahiedmnoscbo,meiflnisqoatwutwgiioodhensioc,norghfetamhomseoeuasrseesy,
Suspension ptmharAiocrturiocgslshyecossoutetpaamriceliaqdliulnyiisdpvwoeirshrgisibacelsdhe.

State of matter gecoxaOniss.dnteisti;oofnstsohleiindth,wrehlieiqcuphirdimncaaitpnteadrl

132 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Hands On!

tosbphufheebsyEmucssvblitcaeeasasarntyslsactipinhfleyirciesn.oed.GgpsTeeianahrnrttleoeiloeorursewancflasdlaoystru,ueesfssgo,utolibcolsorlsiawmleetasssaasn:rdibcnfeieycasuabtphctoioeauonnirtf tbsyuapbs1ese)st dCa: snloaocnlseidssssictf,aialcitnqeaubstii:edoWcnalanitoshdfsgitfshiaeuissdbeicssn.rttioatentrhciroeenes,

States of Matter

Gases Liquids Solids

• Gas particles are very • psfLsaopairqlrtaihtduicceipelrdeasarttpphaicaanalredrnttsiht.cbhalaevenetswmseoaoelrridene • athSbonaeogvltoiewdertedhpveeeaenrrrlraytytihncmdesleamapsnraaranarlreltneircsg.lcpeTelashodc.esineey
far apart and have much • saTorheleidwbpeoaankrtedicrsltehsian.nathloiqseuiidn • tsToohleeidascathtrtoroantchgtetbrh.eonpdasrticinleas
more space between the • Tarhoeunpdaretiacclehsocthaenr.move • mpTlhaoecveep. afrrtoicmlesplacacnentoot
particles. • sThhaepyefloofwthaenirdctoankteaintheer • They have fixed shape
• The weak bonds in a gas but have fixed volume. and volume.
attract the particles to
each other.
• They move freely and
diffuse.
• They have no fixed shape
and volume.

3 States of matter

SCIENCE LEARNERS MATERIALS GRADE 7 133

Chapter 4

Hands On Activity Date: …./.…/….....

Knowing Mixtures

Objective : 1. To use the particle arrangement model to experiment
and examine the arrangement of particles in solids, liquids
and gases.
2. To use the particle arrangement model to explain some
properties of substances in solid, liquid and gas states.

Problem : How are the bonds in solids, liquids and gases different?

Hypothesis : __________________________________________________

Equipment :

1. A plastic bottle
2. Form beads
3. A rubber stopper with gas pipe.

Instructions :

Picture Here c1.loFsiell uitpwtihthetphleasrutibcbbeorttsletowppitherfowaitmh abegaadsspaipned

tf2ho.rromFulibgpehathtdhesembpooiptvteele.iRnutepocsotihdrdee tbhdoeotwtflienn.diaOnngbdss.ebrvloewhoawir Picture Here

134 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Picture Here 3fr.oPmousrtehpal2f .oRf ethpeeafotaSmtepbe2ads out of the bottle

b4fr.ootmPtloeus).rteRhpeapl3feoa(f1t/tS4hteeopffo2fao.mambebaedasdsouatroef ltehfet ibnotthtlee Picture Here

Record :

Amount of foam beads How foam beads move when blown.

Full bottle ____________________________________________

Half bottle ____________________________________________
¼ of bottle ____________________________________________

Summary :

_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________

Questions :

1. What states of substances do the foam beads filling the bottle full, half, and ¼
represent?
________________________________________________________________________
________________________________________________________________________
2. How did the foam beads in different amounts in each of these bottles move?
_______________________________________________________________________
_______________________________________________________________________

SCIENCE LEARNERS MATERIALS GRADE 7 135

Chapter 4

conla2scs)o Cifmileapdsosisnifiittcoioanttwisoo:nSgourfobsuusptbassn.tcaencsecbaansbede
cttpseshhuuloueermbbrIAmoe.sss pueaHtthsoaanmguoounnthbsmemncc:sodoeeoctcsuagssogo:ntemeps.cccnnappeeaaTleeotsonnrhosauaiueansbbtnisndoeesddnhussccobusauallosgmlnbaautladuasssmortsstn.ipagioiicnffnreneiiuoeecssmnpdd.e.ee,Proiiahtnnuinuaerttdeoosss

smdvcddiuoiiisfisflfblfikAIselbeIo,so.rlr iaeetHldhevanne:eneandttttdndcceesdoueprrpuoomssasohggtprpwaectepeossndannan.eenedserorTtioiniofubhicfuntnesselesesrwtse:shhcsuacnaeulbitatatnetbsnapesrtsa.rtsarrheotloinaewfpogicneabeeeacdtrvsneiteriioereinauaohssntnuaoilddnsys:
1wcb0aah-nsi•34ce )bhc dACeetlnohcastnelusiamssspppeisafateiiefrrcinttreiiassccdtililoneeiionndnsstoiiiaizzsomteehftserhi:estseeeSurla.umgbErbrsgixoxsteauttauarmpnrnstepchc.leaeeonsssf
aw•r aiApdentareedcmrrsto.iiaucsllmildoneidgedsty,ieziasrewn.tdiEahsxted1eau0rmms-a7tipxpn-lte1udas0rret-Tia4chroleceafesmiwnisnhitlickimtchesheenatttleaeahriddres.
• tacAhreeesnoptsimlaaulritetniiotceenlerwsisasiitnzetehrdeaiisanmmsdmiesxatyteulrlruer.eprE.tohxfaanmw1hp0ilce-7hs

136 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Exercise

1_______._______Hd_______o_______o_______ew_______s_______me_______aa_______cn______________hy_______cc_______rr_______iitt_______ee_______rr_______iiao_______n_______a_______rce_______l_______au_______ss_______se_______ifd_______y_______fso_______u_______rb_______c_______sla_______tas_______ns_______ci_______fye_______i_______sn_______gi_______n_______sto_______u?_______b_______s_______t_______a_______n_______c_______e_______s_______?_______H______________o_______w______________m______________a_______n_______y_______s_______u_______b______________g_______ro______________u_______ps
2. Compare the properties of solids, liquids, and gases.

Properties Solids Liquids Gases
Particle ____________________ ____________________ ____________________
arrangement ____________________ ____________________ ____________________

Bonds between ____________________ ____________________ ____________________
particles
____________________ ____________________ ____________________

Particle ____________________ ____________________ ____________________
movement ____________________ ____________________ ____________________

Shape ____________________ ____________________ ____________________

____________________ ____________________ ____________________

Volume ____________________ ____________________ ____________________

____________________ ____________________ ____________________

Pictures
of particle
arrangement

SCIENCE LEARNERS MATERIALS GRADE 7 137

Chapter 4

3. Complete the crossword grid about states of matter

138 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

4.2 Changes in substances Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai meaning

Condensation vaTphoer ocrognavsetorsaiolniquoidf .a

Cchheamngiceasl fcodsaTournhihCirfbgdemfheeismnptarayainercnlnoenaogcpwltneeefrescrseosstoiau.ewrrmcbsemhtsiplifocatronaohtensmnnhdecaaenetnhvttswdeoes.
swseeiTnadhdoie,mrfielcloanewyt.isinnggcawdrarotieewrd,ntbhoeyf
Deposition stouTbthhseteagnatcrseasnfrtoasmtieti.tohne lioqfuida
Evaporation

Freezing ttsbtureoearFmlnlniordsespwiiefeitinizcirottiaasnonttgfuiaorw,renasehe,oleszilioriissdnekgalwnoapohwpwloeiheqinnnaruetsaiitddess
cPhhaynsgiceasl othfCesuhpbahsnytgasneiccsaelsthptoarotcphceaarnutgiseees.

SCIENCE LEARNERS MATERIALS GRADE 7 139

Chapter 4

Hands On!

pscitnyharposauWeuppssbeeeh:sr,tePtotiaenohansrycasnsseiectuasswactuclehsbaaunaansbdlstsbsaotCecnaohcncclecelohameras,.cnsicTshgifmahiaeeelendccalghli,hnnaeadftnsloang,cgvtewoaietsrnoss,.

1. Physical changes
• Physical changes cause the physical
properties of substances to change.
• Are not related to chemical reactions
and don not form new substances.
• Examples of dry ice sublimation (the
transition of a substance from the solid
to the gas state), dissolving sugar in
water (the transition of a substance
fwssrtuoaabtmteesr)tta.ehnvecaepsoofrlrioadmtiototnhet(hthleieqsutroiadlunttsoioittinoh)ne, ogafnaads
Dry ice sublimation

2. Chemical changes
• Are related to chemical reactions and
form new substances.
• Form new substances which have
different components and properties
from the original ones. They cannot or
barely change back to their original
states.
• For example, sodium metals react with
water and form hydrogen and sodium
hydroxide. Metals react with oxygen in Rust formation
the air and form an iron oxide or rust.

140 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Comparison between physical and chemical changes.

Physical change Chemical change

They are not related to chemical reactions. They are related to chemical reactions
They do not form new substances. They form new substances.
After transition, the chemical components After transition, chemical components and
and properties of a substance remain the properties change and a new substance
same but their appearance changes. is formed.
Transition to their original state can be Transition to their original state cannot or
done easily. barely can be done.

(mcteJhm)ea.HapnItseegiuasreartseotiusdntroeaeitsnofhoofecrftmhasseutloaobfrtfaesieectsanstoone(rcfrCsgesyausalbfww)feshiottchairctnihinjtcosgceuuastlhesn.eesit btoobiliencgopmoeinat.gas. This is called the
• tWbephneoehecineroctng.moyaneasssntoaadlindliittqispsutohiediemn.atTpthaeeitdrsa,witisthugtirhceaehirnemasaemcsltohoinleridges • Wtctfhreoeemhenefzspreenteasernzaattiontpuglbiorqepeincuootidindmaet.tecisrwaehacsiscooehloidsla.etTdolhi,qistuihtiidess
• Weconhneesrngtayan.ltIiqtpsuotiedinmitsaphteewraahtteiucdrhe, aitregliaqacuinhisdemsboothirlees • ctWbceoeohmncnedospnmeteanerasnaaattgtuiploairqnoesuipniiddost.einaTcctth.oriesnwadhisseieccnshasleltaeodd,gtthiahteess

Brain Teasers

How does heat affect the states of substances?

SCIENCE LEARNERS MATERIALS GRADE 7 141

Chapter 4

Hands On Activity Date: …./.…/….....

Temperatures and changing States of Substances

Objective : To examine the changing states of substances when their
temperatures change.

Problem : Can the change in temperature of substances cause their
states to change?

Hypothesis :

_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________

Equipment :

1. Water and crushed ice 4. An alcohol burner
2. A 100ml beaker 5. A stop watch
3. A thermometer

Instructions :

1fr.omFillthtehebobtetoamke. r with water about 1 cm high
2w.atFeilrl lethveelbriesaekse3r cwmithhicgrhu.shed ice so that the
3(R0.escPeolcradocnedthste)he tethmeprmeroamtuereteratintothethebebgeinankienrg.

142 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

3tm4iTtos.i0mincHbeuoseotoeeaiallcs.tinno.tdghnEedxprtseiwon.ciagnoWtuter,idrshchewotnhtinhtehteitnhttbuheeueemrnawpbeleoacrritolaeaihntrnuogdrlreeiblteaueafcrovvnhreeeerr3iyst. Picture Here

Record :

Time (Sec) Temp (oC) Changes in ice Time (Sec) Temp (oC) Changes in ice

0 _______ _______________ 270 _______ _______________
30 _______ _______________ 300 _______ _______________
60 _______ _______________ 330 _______ _______________
90 _______ _______________ 360 _______ _______________
120 _______ _______________ 390 _______ _______________
150 _______ _______________ 420 _______ _______________
180 _______ _______________ 450 _______ _______________
210 _______ _______________ 480 _______ _______________
240 _______ _______________ 510 _______ _______________

Summary :

_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________

Questions : 143

When putting crushed ice into the water, how did the temperature and state of
water change?
________________________________________________________________________
________________________________________________________________________

SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Exercise

1. What is the difference between physical and chemical changes?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________

2. Identify which changes are physical or chemical changes.

Changes Physical Chemical
Grilling raw meat
Dissolving salt in water ____________________ ____________________
Evaporating water
Burning a joss stick ____________________ ____________________
Rusting metal
Sublimating mothballs ____________________ ____________________
Condensing water
Frying eggs ____________________ ____________________
Tearing paper
Digesting food ____________________ ____________________

____________________ ____________________

____________________ ____________________

____________________ ____________________

____________________ ____________________

____________________ ____________________

144 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

4.3 Pure Substances and Mixtures Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai meaning

Colloid apnaAdrtiacsruleebsnsotdatonecanseoiltywsfhielettetrlreeedtoh.uet
Compound
Element wtaorhgAeeentchshteuwerboimnsoiactrafaimxnleloycdreecporeofmlopembor mrietnioneentdds.
subPsutarence
Solution isconefotAopnaaotptratoahuitmneerersdsasuoonubrndbslbytsarctonaaokcnnneecnnese.odttoythwbpaenet
saiiostnausnntTmbedopsheacsttarwuoeptnsbmorc.ospIeptgthaoetrcnhuooratcanuynmetdptchbssaoor.e:nongducetaegllaehihnnsmaosssoueiofttinunehatldessyll
wgothfaheAstiscweehhso.o,mmooarroymgabeoecnrsoeeomosliubdusisbn,samltitqaiioxnuntciuderoses,f

Suspension mpthariAocrutrigocshslyeocssuottpeaaimrcleiqauldilindyisopvwreigshraisibsce.ldeh

SCIENCE LEARNERS MATERIALS GRADE 7 145

Chapter 4

Hands On! rcpoeacluslccttouiaunrrmieun,msany,tinuttrterohacgelhelsynnize,setaiuduncmdehloeaxmanysdegnechtnuys,rdsiaurunomcdgh.ethanes,
osawesipdanhctltfeaheoootivirAetcmhmcwhetenttihrelonciotoccinmlispnioseanutsesnsstcsttt.odsh:hrlueimuaPseeruapcntrroiisfnoocnrdtir,guodutgyortusntthenohriaotdneersenfneutisrbcsdtdcaohwe,entdtruvniblhedodnuatryeaweeceerntrile.eufoyeuhoodltueunraffascotdbvarcatnoaerynmcomnsrenoamsboepsdtaueoantaenneemnatraldddenssy,l
tohfesTmuhbeinsttsoaimntwcileaosrgacrnoadunpdbsief.feurseendt ptorocplaesrtsieifsy
4.3.1 Pure substances

ohabponnreomldyAcplocoeagonrsptmeseyniufptsieheruoordebuounsuisntdgsatsoshnuu.otcbwbuesotstaaagtnnlalrdcointeushcptaphessaa:trtehtcisleeos.mnIsttaeatcmnhiantneess
ccinaotonnA1nto)an oEtihetnleelsbemremoseunseneblnytpstsitaosarnnaaectpeetudsyr.peoSersoubombrfoesaktaeetonlnemcmdeeoathnwnatdnst

2) Compounds
afafhFroyororefdrmimAxreceoetxhdghdcaeoeompmsnwmrepoi(hcHlppoeea)foo,nllartyuwhtnitoenwacdndtooce.omorxIonityb(ssrsHgitnpmei2taeurnOoode(p)rsnOeetucto)roeeb.gtinleleseesstmtmihasdeetensinrfncfteotisensr.f

146 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

4.3.2) Mixtures 1) Solution
cawCbofacrnasouohovnntmtilAaflchsootrbhhetiliidlmtaoetowcau.bswoirecoxeleensnatsu:totnthretrrSasoieteguuttomiooebmlciursn.oshitiztxtirTeoaeeasthmunnuder,cpsbiecieuSusnpasvtbrutraloealossysnrpptttcyscaaheeeuoyrndrnesbtmceist.eesheipMbostegaeininmxornns,eotfdcauaadumtierdnnphesidgeeness, IscstuusobnbApsssrtttoaisatupnonecelcneurettsiteisowcsunoibtdhnsiifttasfaaenivrnacaifenrroihsgam.obtmlewthoopogrsooeeprnooemrftoiootuhrnees.
bscaoonelmduif.o tptiuhSoonentndaseo:tnitnehtAsest:hrsoraaoenrnleeuedtssisotuaonbctlvesocestmano.ntnpscs,oeiswnitshseaincoshtfosctluwaotnoef

Examples of solutions in everyday life in different states.

Solution State Solute Solvent

Air Gas Gas Gas

Water vapor Gas Liquid Gas

Soda Liquid Gas Liquid

Syrup Liquid Solid Liquid

Amalgam Solid Liquid Solid

Copper alloy Solid Solid Solid

Hands On Activity Date: …./.…/….....

Components of a solution Experiment

Objective : 1. To conduct and experiment and explain the components
Problem : of a solution.
2. To explain how to examine the components of a solution.
Are only liquids the components of solutions in liquid state?

Hypothesis : __________________________________________________

SCIENCE LEARNERS MATERIALS GRADE 7 147

Chapter 4

Equipment :

1. Three liquid solutions: saline water, syrup, and
soda.
2. An aluminum spot plate.
3. An alcohol burner with wind-blocking screen.

Instructions :

Picture Here i1n.tPoothuer 1aclumm3inoufmeascphootfpthlaetteh.ree liquid solutions

2. Place the plate on the top of the alcohol burner. Picture Here

Picture Here 3ev. aHpoeraattet.hOebssoelruvteioannsd urenctiol rdthaenyy ccohmanpgleetse.ly

Record :

Liquids Temp (oC) Changes in ice

Syrup _____________________________ _____________________________

Saline _____________________________ _____________________________

Soda _____________________________ _____________________________

148 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Summary :

_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________

Questions :

1. How can the components of the liquid solutions be examined?
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_______________________________________________________________________
_________________________________________________________________________
2. When heating a liquid solution, the solvent evaporates and there is no solid solute
left. Can it be summarized that the liquid solution has only one component? Why?
_______________________________________________________________________
_______________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

SCIENCE LEARNERS MATERIALS GRADE 7 149