Science 7

Chapter 4

acaroesmOutpbhthoesentaraenmcncrtoi.etuenriisat aatonsddoetlhuteetermsotianrteeawosfhoeelvtahecenhrt of water. This means that ethanol is a
solvent, whereas water is a solute.
• If a solute and a solvent are in the • If a solvent and a solute have different
same state like solid and solid, then states like solid and liquid, then
the solvent is the substance present in whichever substance has the same
a greater quantity, whereas the solute physical state as the final solution is
is the substance present in smaller the solvent. For example, when table
quantity. For example, 95% ethanol salt (solid) is mixed with water (liquid)
consists of 95% of ethanol and 5% to produce a solution in the liquid state,
water is considered the solvent and the
table salt is the solute.

Components, solvents and solutes of some solutions.

State Solution Component Solvent Solute

Copper 60% Gold
Crown gold Gold 35% Copper Silver
Solid Silver 5% Zinc

Brass CZopinpce4r 06%0% Copper

Liquid Syrup Sugar Water Water Sugar

Vinegar Acetic acid Water Acetic acid
Water

Nitrogen 78%
Gas Air Oxygen 21% Nitrogen Oxygen Others

Other gases 1%

2d1olito)f0ilosAoSs-kp4ouuseakbuscstrpssseaptoeeanepnsdntnusaicmsisqoseipeouunsetne.benTisrassshtniaaoedinnmnpcifwiaedxlerititutahfiisctrmeauleleonantsfdraetigizwkrse.eetourdIotrfybtfehpyetyaohedeneus,, wsptsohuefaaesspptupesaesruerrpasanaeptnsnenieddosnfncnirdosoeanemlcmlsdoapanopohrnbtaeaho.rnmettiecrpulpaesdsasudspbyw-estwihrltl.arasoEnteeuxctargte,lmhec. apfaTilnlntheeadesrl

150 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

coi3cmspihfptsnwilto)tooaatahiaAeodxlmrClpltelptoreioiweaoocrocippsdirmrleldgomrl:ea.aoolmlseslepllasiTxodanopteiokihiezcnmeldairireerndadeor.bagtn,oiuiTsdtcutclefsyihiootlqbttlepahyenmsluneseoesu1oimopsoadeb0tditknnoit-soisxpahs7dntofetnaparaue-pcopsdrn1enrntauuaaei0rcyctgsnbgqrs-ealeta4sheupo.htdsotseecafaIac.nfsestnafeatrusnahcarlocnlbeteotedmoidhmcspscdnrtotl.oheaeatihiktlauaTanltilroeoleiegenhccninrddeehaeehss, bcsbcBsmnaouuanoateeeahCbldlbtctsllduweeoosoisdrredifetlmtdaloaeoaeslagnlesalininudyklc,nmc,besieaptnewsesonaiistnusmrotoraathetcotcinulehescsahacleuvtlsdeealaeerbliaenosbisrtrssddyyhnl,tedrpda.afcaeaoobneanAlnsnroycycsndonueeaaiefolndsmideccftg.elsmtdaoouhdTinnllauncilesihnosgnglaisebfipddinmtieaeoethairnwinmroep.dxmsochatdeetcsuacehienakrnrueiidnenetysr-r.

Examples of colloids in everyday life

Name State of colloidal State of another Examples
particles substance
Colored mirrors and colored
Solid sol Solid Solid stones

Gel Liquid Solid Jelly and gelatin

Solid form Gas Solid Pumice and lava stones

Sol Solid Liquid Blood and oil paint

Emulsion Liquid Liquid Salad dressing and mayonnaise
Foam Gas
Smog Solid Liquid Whipped cream and shaving
cream

Gas Smoke and dust in the air

aerosol Liquid Gas Fog, clouds and water vapor

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Chapter 4

Unit Review Date: …./.…/….....

Directions : Complete the sentences with the given words

Suspension Colloid Pure Substance Solution

1. _______________ It can be clearly seen that it is a heterogeneous mixture.
2. _c_e_n_ti_m__e_te_r_s__in__d_iaTmheetepr.article size of a colloid is approximately 10-7 -10-4
3. _lig__h_t_is__n_o_t_s_c_a_t_t_erWedh.en light goes through a homogenous substance, the
4. _in__th_e__m__ix_t_u_r_e_.__ It can be clearly seen that there is more than one component
5. m__e_l_ti_n_g__p_o_in_t_.___ A homogeneous substance with a fixed boiling point and
6. _______________ Milk, coconut milk, fog, and salad dressing
7. _______________ Water, baking powder, and mothballs
8. _______________ Saline water, syrup, and brass
9. _______________ Noodle, salt and chili dip, and sand
10.c_a__n_b_e__s_e_p_a__ra_t_e_dIffrloemft uontdheisrtusrubbesdta, nthceessu. spended particles will settle and

152 SCIENCE LEARNERS MATERIALS GRADE 7

4.4 aPnrodpMeritxietusreosf Pure substances Chapter 4

Date: …./.…/….....

Words to Learn

Picture Word Meaning Thai meaning

Boiling point a lTiqhueidtecmhpaenrgaetusrientaotawghaicsh.

Dseunbssittaynocfea tohfeSvhoslouuwbmsseta.hnocwe mhauscphemr uansist

Mass sutbhsetaanmcoeu. nt of matter in a

Melting point a sTohliedtcehmapnegreastuinretoaat lwiqhuicidh.

Molecule arcstoemagaAcnacehlgttteliaehromoksenetuir.c,fpuparnolaedfrcptaaorimtenmosempaenosnctuatbhinlneodugmnndtiithtcehaoadetfl

Temperature hpeasoheexrtocarphcowoterebpmenidrjvsepebeesscaygdeertrad,anbetteyteihaivntsoeoceprarucmesicosnccohutrem.aidbanlsieelnstltayiegtaynrnactoodoesrf

SCIENCE LEARNERS MATERIALS GRADE 7 153

Chapter 4

Hands On! ieaesoeifaTatnnhotxnnftbrhcrertteeevorocestraahbriernoertgceoeovamgrsstbyadnisielolooioemiptnrqoonelfsgoetnuetnh,aohrcfnipetadovtehuthsourteregl(ueciineirnmasnylcbetistimqtir.ososeel)fWutmlr.coqraetaoimhdlohunceenmeneaocucbdttnlhleluyeievtnehtlbtcteasoahhueeiuspreneegcetlotahsotseo,aeruretfurmiotmnrmhratprprheeoptocoreterueeruelhnvheansrnslaaoiacicgsdqdsnpututuuhuiuiigngonolrreariggdrehneeerr.
tahnedTghsreoablpuohtiiolbinnegslop(wmo.inixtstuorefpsu) raerseusbhsotawnnceins
bemcpssedcamuloarxoeeuieeegcalsmnnroPtilmhihtsehotlrhpyyi,itfobnatilyilnyyaceoadssgs,enixfnei,absdcdddrsplwtwoaviaufisofiailnftthlilbehimrleibnpisnsberic,lgdteerettscehoa,elnapelopnanutnaooil,cneosptsdfniiendrrfetrty,tdhmotshditi,sechepn.e.aomsaedgieWnrrsnneereodutthblinhfblbtee,mdohesessscneiiieltfurttiaafeyynyltbicthcnrxsipgnesheacutwetagemealhpstilsmllspniiolitgnanaacoiaichibnenntetirenyaldddteeys,t,,l
Ttfdeohemrepc1pee.h enAsigrdahsbbtuooeornirtelwilntohaegwetewipnnbhotoeiiicintrlshimtnigootmlbfepoeacolcueinlolicaqtmurouaelfiedtsatsraa.ilsicqgTttuaihhoisdnee.

athathhraeesenTudbshfbia,oxesemittllaihidnnenegecbtbegepeomrocwaiialpnpiiluntlehssgcrseahohptafueoonprawiegnucs.etrhsetOhinmosantufototbglmhveseeacitnxapueotnoulretcrahreeleailnssyrt wmabcteoroimoetmihlrpivenpaeagorerhaniaaiptgeubsonhrillieeteyn.srtiAntbbhweosaaiciulnllwiabnbuiasgdsotnaeepiolnoortachaifnnenemtdg.rwoesrieetuhovbtfahasbpatlonoaoirnowlaincnetgeeer

154 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Wcgitneoatmheni2nerptm.inn eeAuornaaoloemtuuucsesrguoellytlhailan,irdtetghawnetsptehrumaroicgbcionhystltietoittacoonbnuffeocolaecversocesmeorioscsfleiotdchshmaeeliiuesqassuotttienhhildiddgee. trshetaestuemlt.,othleecsuoleldscthoamngoevseinfrtoeethlye. lAiqsuida
saurebTsshhtaeonwmcneesilntianthngedpgsoroainlputhtsiobonefslob(wmo.tihxtupruerse)

rImhosIttinnhnhnatfaaaueenrvtattTgslrhgheteodihieeneesnbwdefngteitiiexsoeentrmipeasruofmtrmooadanbnempiigl,slondl,timeeeitqtlmnaesrmtluehatogncoitilatnifhdtculxuietpmgnaetlrcastueognshetutrsriaeenlseltpaetiammttnespsohrtegstapuiaanraoilrtaeztlrterefeeseercceqrmasshtofumiatuuiiaopuxrnafbbnonfeerleasesg.lrdaecrtatsfeaIeacott.tsswunnurtiiTcnchrcclniteedhacheeeesseeeeanisssr.. BepthmsfowmohCaxaoireiilhxamxv.mlinetaempbueWtedvsuerlpdeome,rhtl1ehwtesbethe1ah,eysnel0fnteSuroid-nmuberm1tisgmfhbas2faeeeetcs0epmlalrttthdieoainonentCnionwcgngbtfcme.tosytppeshheuo,oeaspAlbatiivnuinussnnaetbutrtgdsaneoblsondtftpsthshwcattSouahaeeeniubnennsrcmbsctwemmetseiaaaxistiesttaxtcnhu.ltn1thcauFritnc5heerroogeee0essrf

Examples of colloids in everyday life Melting point (oC) Boiling point (oC)
Substance
-183.0 -168.0
Methane (CH4) -116.2 34.6
Ethyl Ether (C2H5OC2H5) -117.3 78.3
5.5 80.1
Ethanol (C2H5OH) 100.0
Benzene (C6H6) 0 357.0
-39.0 58.93
Water (H2O) -8.9 883.1
Mercury (Hg) 97.96
Bromine (Br2)
Sodium (Na)

SCIENCE LEARNERS MATERIALS GRADE 7 155

Chapter 4

3. A density of a substance shows mixture is variable depending on the
how much mass the substance has per types and proportions of constituent
unit of volume. Each substance has a substances in each mixture. Its density
fixed density. A substance with a high can be found by dividing total mass of
density has greater mass than that with the components by the volume of the
a low density. The unit for density is mixture.
gram per cubic centimeter (g/cm3).
In addition, the density of a
Each substance has its own density. substance can be changed according
For example, when placing a block of to temperature. Therefore, the
iron and a block of wood of the same temperature of a substance will be
size in water, the iron will submerge identified when recorded. Pure water
into the water but the wood will float on has a density of 1 g/cm3 at 40C, for
the water. For liquids, such as oil and example.
water, when mixing two different liquids
of different densities, they separate. Oil floats on the top water
The liquid with a lower density floats on
the top of the other liquid with a lower State Density (g/cm3)
density. In the same way, the gas with a
lower density is on a higher level in the air Solid 7.8
and the gas with a higher density stays Solid 0.92
below; some balloons can fly because Liquid 1
the gas balloon is less dense than the Liquid 13.6
air. On the other hand, the density of a Gas 1.21
Gas 1.98
Examples of colloids in everyday life
Substance

Iron

Ice

Water (at 40C)

Mercury

Air

Carbon dioxide

156 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Unit Test Date: …./.…/….....

Directions: Part 1 Choose the correct answer for each question (10 marks)
1. Which of the following is not a physical property of substances?
a. Boiling point b. Melting point c. Combustion d. Solubility

2. Which of the following is a chemical change of substances?
a. Dissolved salt in water b. Sublimation of mothballs
c. Coal combustion
d. Evaporation of water in natural sources into the atmosphere

3. Which of the following classifies the substances based on particle size?
a. Solutions, suspensions, and colloids
b. Solids, liquids, and gases
c. Pure substances and mixtures
d. Homogeneous substances and heterogeneous substances

4. Which of the following statements is correct about compounds?
a. They are formed when two or more elements are chemically combined.
b. They are homogeneous substances.
c. They are homogeneous substances consisting of a solvent and a solute.
d. It is clearly seen they are heterogeneous substances.

5. Which of the following statements is incorrect about gases?
a. The energy in their particles is higher than the attraction forces between
the particles.
b. Their particles are very far apart.
c. There is very small space between the particles.
d. Weak bonds in a gas attract the particles to each other.

SCIENCE LEARNERS MATERIALS GRADE 7 157

Chapter 4

6. Which of the following particles move freely in their containers?
a. Solid particles b. Liquid particles
c. Gas particles d. Solid and liquid particles
7. Which of the following are homogeneous substances?
a. Paper, coins, and plastic
b. Sugar, noodles, and syrup
c. Gold, water, and salad dressing
d. Water, milk, and coconut milk
8. Which of the following gases is solvent in the air?
a. Oxygen b. Nitrogen
c. Carbon d. Argon
9. What is it called when a solid becomes a gas?
a. Condensation b. Sublimation
c. Boiling d. Evaporation
10. Which of the following substances will settle and separate from each other
when left undisturbed?
a. Syrup b. Flour in water
c. Milk d. Salad dressing

158 SCIENCE LEARNERS MATERIALS GRADE 7

Chapter 4

Date: …./.…/….....

Directions: Part 2 Writing
1. What are the differences between physical properties and chemical properties?
(2 marks)
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

2. What are the differences between homogeneous substances and solutions?
(2 marks)
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

3. Give an example of a substance made up of more than one substance? (1 mark)
________________________________________________________________________

4. Read the given information and fill in the blanks (5 marks)

Property State

The particles move. _________________________________________

The particles are close together. _________________________________________

The weak bonds in a gas attract the _________________________________________
particles to each other.
The substances take the shape of their
container. _________________________________________

The particles do not move but shake _________________________________________

SCIENCE LEARNERS MATERIALS GRADE 7 159

Glossary

Chapter 1 : Basic Units of Life

Vocabulary Definition Meaning

Organisms sinAgnlein- dcievllieddualilfeafnoirmma. l, plant, or
Uorngicaenlilsumlasr onAencoerlgl.anism that consists of only
Mourgltaicneisllmulasr orAmnoorergcaenlilssm. that consists of two
Cell resTpheonssmiballelefsotr, ablal soifcliufen’sit opfrolifceetshsaetsis.
Living things aliTvhei.ngs that are now or once were
Characteristic platycpei,coarl thoifnga. particular person,
Hypothesis efliomxrapiftlueasrdntuhaepetvirpoidinonevsmneictsaietdoigaenastoioaonrnst.thaperrtionbpgaospissoeiondft
Substance unaifoprmartpicrouplaerrtkieinsd. of matter with

Quality emoxftechaaeesllseusinmrteaciednladoraaf gkrsdioanmidnoe;sf ttthshioonemtghd.eeetrhgitrnhegiengaossf
Conclusion prtohceesesn.d or finish of an event or

Micrometer miodtthstihrsaoettevawagrendobdac.yufeaagstcuweeoransrtyi,hntohgafrnitcoaekmmsnoceeforsawersswheutioscrwwehbitsahecrtadsawnmeftibhenaeeenll

160 SCIENCE LEARNERS MATERIALS GRADE 7

Glossary

Chapter 1 : Basic Units of Life

Vocabulary Definition Meaning

Microscope chmviueeiannlwlnesdir,nroaegtlpdysvtpitaeciimcmrayaelplsslliyme.nssamtlorlaurogmbannjeeiifnmciettasdu,l ssosuerecdvphelafraonasrtl

Shape/Form outthlieneeoxftesronmael ofnoermo,r scoomnteotuhrinsg, .or
Component evesahppiecacleriat.ollyr ealempaernttooff aalamrgaecrhwinheoloer,
Magglnaisfysing oafiminrhaagafgeilnenerdnep,lslreytiyntahptdsnaiec,dttaspaultlraisyloemedsddpuetsctto,heineaisnxnagaadnsmfrfaeiisnnmnueelceapsrhmwgrineaiattdhsl.l

Cytoplasm ltihveingmacteellr,iaelxocrlupdriontgopthlaesnmucwleithuisn. a
Mitochondrion ab(anbcuniedoardmiicnosnhetgbuaenbeoefmerlor)esr.gligdcmianayeenldpmpmerrioonlbolsdwcertaueacncsfreestodile,olusttsnhon,ooeidnffcoirncwerimnnushepri.crlilarIahlatayrhttyeighoaerenessr
Enrdetoicpulalusmmic wacamnteietatadlhmln,cinlebihcptetrowihaddnenotsearcikyn.nynIuodtttoofhupimuesslsusaeiainsmswlmv.lbyoitrolhhvafaenatsdhoreueiibunsknotpausurrbocoymultoeelteeaiincssr
Cell membrane sutrhroeusnedmingiptehremceyatobplelasmmeomfbarcaenlel.

SCIENCE LEARNERS MATERIALS GRADE 7 161

Glossary

Chapter 1 : Basic Units of Life

Vocabulary Definition Meaning
Ribosomes oRpiRnfoNNallliAaAyvpmrinaageignnenpddcutnietdtaurelaselmssnsp.obsaTacfeenhriratrdesitcRyepilnNdberoiAtpnchtedrtoeooinmntsecssyeiy.innsstoststhipefneolngasugsinzeomderf

Chapter 2 : Life Processes of Plants.

Vocabulary Definition Meaning
Plant
cell eraoaolrittvhsi.nagndthihnagstahasttegmro,wlesaivnetsh,eand
obtohwroegdnasynaminsadmlletshsaat ntumdniatthkteheastitsucspauneaslllivolievfitnohgneits
nutrients aannosudurbtishshetammnecaneitntethesanstaepnnrctoieavliodfofelrisfger.owth
Vascular abIsnlordeoldpaltoainnrgtostthoetrhleiqtuuibdessinthaanticmaarlrsy
uAnpdlearngtrpoaurntdthat usually grows
roots atnlehuaatytvtrpieteersna.otnsfsftprisoosmrutsethwienatrveoarosatcsnudtloasrtohpmelaents
Xylem

162 SCIENCE LEARNERS MATERIALS GRADE 7

Glossary

Chapter 2 : Life Processes of Plants.

Vocabulary Definition Meaning

Phloem otrAragnliavsnipniocgrmttiinsagstueferoi,aorldse.sapnodnostihbeler for

Vascular tissue wdThiaffoteesrree,nmtitsipsnuaeerrtasslswofahanicdphlfatornoatdn.stpoort
Cylindrical In the shape or form of a cylinder
Sieve cell Atgaynypsmdeiennpvooersespesileeeevrnmmet esipnn,latwfeotiertfnh.asnpaarnrirmdowitivpeores

Xylem tissue sfpwprulloaaapmtnnepttrtoavharanetn.sddrcoaudollsitassorstotpoislrvtosheuvediedrmetehsisantpteohcrfayotlsnhsiveceayls
Phloem tissue pftphohlaeoondpttsolvasmanysnat.ctdhueelasinristtihtsoesualeellaotvhtehaset rcdopunaridrntusgcotfs
Osmosis osmtohreledvmiesfbfnpurtosasinnotthenarnooeufogwuhastaeprsaeosmrsaoipgtheeermr eable

Photosynthesis dtuehnsioeeexprisgdruoyenciltneiogsthchstre,ebwafyoatwertmehorixo,cyafhgsnpeudlngacanaartn.srbdon
Minerals nsuabtusrtaalnlycientthhaet Eaarerthfo.rmed

SCIENCE LEARNERS MATERIALS GRADE 7 163

Glossary

Chapter 2 : Life Processes of Plants.

Vocabulary Definition Meaning

Diffusion tshpereaacdt ofrfeseplyreading or allowing to
Concentration aonlaergpelacaemount of something in
Particles is a small piece of anything.
Solubility aTcmhaenouabnmetodouifsnsstooollvvfeeadnstiunbastgainvceen that
Equilibrium oapsptaotseinogf bfoarlcaensceorbaectwtioenesn
Osmosis sltphohoiegwelrvhmeseerpen-rco-atconbmontlaeoncnlceemeencoenturumtalresatbistomrioantohnnvsreoseouomlfurgloutehimtonioantnaost.ofema i-

Effect ccaoacnuhssaeen.qgueenwcheicohf iasnaarcetsiounlt oorr other
Transpiration ttsfrhhtoeremompusargoehacrniaeadslpsfpllaooanwfrttwesa,rasnst.deurcitmhs oaevsvealempaoevrnaettsio, n
Wrinkle a slight line or fold in something
mpeersmmebmeraai-bnlee. mmbalooobclleeakccrirnuuieglleersstth.hteoatppwaasisllssoatnghleryooauflgloohtwhweshroilmee

Monocotyledon Atphlnaeynstoesfehada.cvliansgsaosf iannggleiocsopteyrlmedon in

164 SCIENCE LEARNERS MATERIALS GRADE 7

Glossary

Chapter 2 : Life Processes of Plants.

Vocabulary Definition Meaning

Dicotyledon Acoptylalendtownhso.se seedling has two
Stem sapthublaebontmveteoarrirgansrnobheuoraundnbdy.,botyurptsiotcacalkcllyaosrfiiosainnaglly
Embryo aseneudndeveloped plant inside a
Stomata aaonnr ydpooyrfoetushneignmtshitceermoesspc.idoeprimc iospoefnlienagvses
Photosynthesis eudthsnioeeexrispgduryeonicltniogetshchstre,ebwafoyaterwtmeohrxo,icyafhgsneudpnglacaanarn.trsbdon
Chlorophyll pocafnhigclyomyoraoefnpnsotleasbvsfaetoscruatonelfdrrieaaillnagatatneheddeaigmnnrdeethsepeonlsaonmtse. s

Factor erisexsspuoelmtr.imeIttehcniantngobrthenaaitntucaroanclltoyrinbotucrotcelluserdrtionlagab
suObrsgtaanncices aawdarnceaetdtsievatdreibgtiwyfuefaenntrdteesarn,,nftiatnpticsnrol,uddpdouhimncagtresmssotaoifccahepuusmt,icaanls,

Process pcaaasrrertiirceieudslaoorufrteainscutoilotr.dnserwtohicahchaiereve a

SCIENCE LEARNERS MATERIALS GRADE 7 165

Glossary

Chapter 2 : Life Processes of Plants.

Vocabulary Definition Meaning

repSroedxuucatlion bidTnhiyffofeetrhrmpeeranocttdoiosumnecxbtoieiofnsntawtoioofninneodwfivgioderungaealtnsicisomf s
repArsoedxuucatilon oncisrohartcoihtnmyavponoesglvoeoemfintrehesteph.refoudnsiuuomcntbiooefnrgtoahfmatedteoses

Pollen aplafinnetspwohwednetrhperyordeupcreoddubcyec. ertain
Fertilization fTmehameleaplegroagcmaeemstsee,toeof,rcoosrpmoebvruimnmi,nwgitthhethe
Pollination fgisloratwhineesratfocrottmhoef tthfreaemnmsafaleelrersinatigngtmpheoarl.leonf a
poCllrinoassti-on ftlohweetrratnostfheer osftigpmollaenoffraonmotohneer.
Self-pollination tshtahemeaetrnaftlhnoeswfreetrro.otfhpeosltleignmgaraoifntshferom

pistil fthloewfeerm. ale reproductive part of a

Chapter 3 : Substance

Vocabulary Definition Meaning

solid orfifrlumidand stable in shape; not liquid

166 SCIENCE LEARNERS MATERIALS GRADE 7

Glossary

Chapter 3 : Substance

Vocabulary Definition Meaning
liquid wcoahntaesvrtaionnrgtovailo,lciu.oemn.,esf.ilsotweinncgyfrleikeelythbautt ooff
gas wwsvhohhaaloiucpslmehueeboi(tsfu(watunaniclnlillkoickeeneextaapoairanslnmoeiqdrlaiu,dthfit)dreae)arve.niilnnydgatnonsootfaiflfliitxxeteehidden
dutheetoachteioant.or process of liquefying
melting tahnetdhteetumarncpsteiortoantvuoarfepboarrtin.wghinicghait lbiquubibdletos
boiling
proton Positively charged particle
neutron Neutral particle
electron Negatively charged particle
nucleus prCotoornes aonfdanneuatrtoonms, containing
Subatomic Smaller in size than an atom
element c(da1hroee1ewa8mpnc)rihicismnauotaloblfyrysmsitnicamotoenrpenrcclseeottshrintausvtneuhenbraottstesntdaceonaofhcnrmuebnansorotdttakerbener.dden
ebnyevhxiruiosmntimannegkninti;ndn.oort mcaadueseodr cbayusthede
natural scuhsceuhmbaiscsatawl nactcoeemr,patohirs,aiattinohdnantsihtrrooaguegfinhx.oeudt
subpsutarence a large amount of something
abundance

SCIENCE LEARNERS MATERIALS GRADE 7 167

Glossary

Chapter 3 : Substance

Vocabulary Definition Meaning

compound chtewmoicoarllymcoorme beinleemdetontfosrmthamtaattreer
metal tdhhauearcrdmts,iloaesllhi,dcinwoymint,hdamutegacroltiliaeovlaidtbythleeal,et fcuistsriitbcylapeli,caaannllddy
nonmetal noatna emleemtael.nt or substance that is
metalloid asaoenfraemtminmiicenootetnaenlyldrse,mumoacerntedodtniirnasts)t.eow(liebdh.oegnstwoe. nepamerrnoesptaetehlnrsotiisecoesr,

temrpoeormature 2s2t50aT°t°hCeCes), rO(oboxufmtomrtdeamyEpvneagrrlayistufhrroemDiisc1ta5ior°oCnuanrtdoy
conductor heaeAsaitlmya.antderiealle, cotfrtiecnitympeatasls, tthharot ulegths
unstable itnshueIcnnsloeestouamsstotetrmooagsnteogatmrheeesnsrt,aohaiuedngbtdhointbdhtoeeinuhgnnoueslcndtaleebtrihgloeeyf.

radioactive abnercaddomiporaeocsttoitvanebsaletao.ms sthweilylloasettenemuptrtontos
raddieocaacytive atopmersiordeaocf htimaesutanbtillethsetargaed.ioactive
hazard symbol warning sign that shows danger

168 SCIENCE LEARNERS MATERIALS GRADE 7

Glossary

Chapter 3 : Substance

Vocabulary Definition Meaning

radiation areenreerlegaysaendddcuhrainrggendupcaleraticr ldeescthaayt.
prompaetrtetyr of tpvaaronsaopldiiuatnrsomntm,pteohohe,bararlertjeteid.enccnsgtae'tsnoshsf,db,memeonaadsmltloiettereya,r,abtecsiinlumoictrlyopelu,rdem,dr,meaestlauutaisrncnesghy,,

freezing point turthnes ttoemapseorliadture at which a liquid
size how big a certain object is
hardness hatrhde. quality or condition of being
mass is,hbouwthneoatvdye,poer nligdhintga coenrtgarianvoitbyj.ect
compound emleoamlneyceunsltesu.sbosftatwnoceor cmoomrepcohseemdicoafl
mixture bosufoabntwsdmtoeaixdnotc.urersemwoishreiachdmaifarfeeterneroinattlccmhheamedmieciaculalpyl

molecule cftcouhoganemedmptgahiocmeruaorne,ludnrreeptpaathclroaetuitfsonecnaina.tttnionogtfmaaktsheecbphsoaemrnmtadliilnceeasdatl

ratio orthseizreelbaetitownesehniptiwnoquoarnmtitoyr,eamthoinugnst,
separate stwomolueotitorhnmoodofrtechhdaetismctioincncavtlepsrurtosbdsautamcnticxmteuisxrteiunortoer

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Glossary

Chapter 3 : Substance

Vocabulary Definition Meaning

beaker mianneadlaacsubuusporuirnaoaglrltyogliqrlaaiuesliissdpswff.ooitrrhphaoowulrdiidniengg,muoasunetddh

Bunsen burner tahegstabrsaoibtgtouhmrtnteurbceownsitihstisnmgatyllphicoalellsy oaft
tripod stand suappthorretefl-alesgksgeadndpblaetafokremrsused to
retort stand einqtaeunippdimeecdeentotoasfnudspcpgieolanrsttsiofwitchaerereqpuieipcmesenotf
filter funnel tsheeaplaalrababotiornargtaotrsoyorlpyidrosfcufenrsonsmeolfliuqfilsuteeidrdisngfvoiar

Chapter 4 : Classification of Substances

Vocabulary Definition Meaning

Colloid fdilotAenresoudtb.ssettatlnecoeuwt ahnedreatrheenpoat retiacsleilsy

Homogeneous coAmpmoisxittiuornethtrhoautghhoaust. the same
Heterogeneous ofAsumbisxttaunrecewsitthhroduifgfehroeuntt. amounts
Mixture cmorahroAteihromee.stpIuietcubrcaorsalegltynasebuncnbcoeesmeoetuaibtmshninecaseerdudsabe,,shwiftnorahomnaimccohvegata.ewrrnieaoobnuoolesrt

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Glossary

Chapter 4 : Classification of Substances

Vocabulary Definition Meaning

Solution cbooreAmmsbhoooinrlmieadtoissog,uneblnoiqseftutoahiunedscssee,msgixwatushreiecsho, fomtrwaoay

Suspension vthirsAoibusygleshtoepumat riantilwciqlheuicisdhaomrreigcraodssi.scpopeircsaelldy
State of matter csooOlniddn,ietliioqnousifditanhnewdhgtichahsr.emeatpterrinecxiipstas;l
Condensation toTahleiqcuoidn.version of a vapor or gas
Cchheamngiceasl phrTeharCaoevcphyeteiaofrdnotnirigesfmsfeaesnfrnrdeoernmfewotlratmshctueoenbmdoesrwptitagoosninnuccaebelhnssoettasnwmnehcaiscien.casdh.l

Deposition sceaTarrhioeerdilcabeyy.inwginddo, wflonwoinfgswedatiemr,enthtes
Evaporation theThliequtriadntsoititohneogfaasssutabtseta. nce from
Freezing sfiwtrsoehFleetiderzremieifniecapgazeliptqirianooutnigiund,rt,etiusirasnalslsopiwonhteaorskaeendsootbrlwaiednlnowswihtiaoeitnnss

cPhhaynsgiceasl prCophearntigeessotfhsautbcsataunsceetshteopchhyasnigcea.l
Sublimation theThseoltirdantositthioengoaf sa sstuabtes.tance from

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Glossary

Chapter 4 : Classification of Substances

Vocabulary Definition Meaning
Heat
fitwnerohmTcmehapneleoorrnttaihreetauesnroe(sobcsfbjae.ejIlrce)tstcoouttrfosnjtoithahsuenalaerovrmsteeha(meJdlr)eiefoafnsbeeujrerreegcndtyt,
Melting whCehnahnegaet iosfaappsloieldid. into a liquid
Colloid fdilotAenresoudtb.ssettatlnecoeuwt ahnedreatrheenpoat retiacsleilsy
Compound ocprroAommpsobourritbeniosenetda.lenmtcoeegnfetostrhmaereredicnwhheamenficixtawelldoy
Element obontehAlyesrpeosupnuraeebrastsytteaupdnbecsooetarfsn.bacrteookmtehnaantddcoowcnnatnainnintoost
Mixture mcroarhoAteihromee.stpIuietcubrcaorsalegltynasebuncnbcoeesmeoetuaibtmshninecaseerdudsabe,,shwiftnorahomnaimccohvegata.ewrrnieaoobnuoolesrt
hcigtsaorTosnphuttaeahpriestnhs:sso.eaImtlomeconmeaglynepenrnbootoenspueceaslrnastsydusustbchbisforsiotemtaaudnpgnicncoheteuoounatttdhwnaasdol.tl
subPsutarence cbooreAmmsbhoooinrlmieadtoissog,uneblnoiqseftutoahiunedscssee,m.sgixwatushreiecsho, fomtrwaoay
Solution

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Glossary

Chapter 4 : Classification of Substances

Vocabulary Definition Meaning

Suspension tvhirsAoibusygleshtoepumat riantilwciqlheuicisdhaomrreigcraodssi.scpopeircsaelldy
Boiling point chTahnegteesminpteoraatugraesa. t which a liquid
Dseunbssittaynocfea suSbhstoawncsehhoaswpemruucnhit omf vaoslusmteh.e
Mass sutbhsetanacme.ount of matter in a
Melting point chTahnegetesminpteoraatuliqreuiadt. which a solid
Molecule ftccouhogAnemedmptaghiocmeruarone,ludnrreeptpaathclroaetuitsfonecnania.tttnionogtfmaaktsheecbphsaoemrnmtadliilnceeasdatl

Temperature petbtoosyrutephacaseehecct.nohdiatmeellrigypnmraaoearsmaesteeivuoxtebreprsrisentocastraenslecnpedeseairtaconycerdciovosofebhrdhdjoeeiwncbagtnyt,

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