T2 ATOMS, MOLECULES, IONS_QUESTIONS

CHEMISTRY DK014
MATRIKULASI KPM
SISTEM EMPAT SEMESTER (S4S)

CHAPTER 2

ATOMS, MOLECULES AND IONS

Face-to-Face Non Face-to-Face
6 6

At the end of this topic, the student should be able to:

2.0 ATOMS, MOLECULES AND IONS

2.1 Proton number, (a) describe proton, electron and neutron as sub-atomic particles.

nucleon number and isotope. (b) define proton number (Z), nucleon number (A) and isotope.
(c) write isotope notation

2.2 Atomic and molecular Define relative atomic mass (Ar) and relative molecular mass (Mr)
masses based on the C-12 scale.

2.3 Nomenclature of (a) Define cations and anions.
inorganic compound (b) Name cations, anions and salts according to IUPAC

nomenclature.
Include polyatomic ion,
e.g. PO43-, SO42-, NH4+ etc.
Exclude complex ions.

6

CHEMISTRY DK014
MATRIKULASI KPM
SISTEM EMPAT SEMESTER (S4S)

TUTORIAL 2
ATOMS, MOLECULES AND IONS

OBJECTIVE QUESTIONS:

HOUR 6

1. Atom which have same number of protons but different number of neutrons are called

A. Isomer

B. Isotopes

C. Spectator

D. Allotropes (CLO 1, C1)

2. To determine mass of other compound by comparing it with mass of carbon -12 atom is
A. Relative molecular mass
B. Relative atomic mass
C. Relative molecular radius
D. Relative atomic radius
(CLO 1, C1)

3. Sum of proton and neutron in an atom is called (CLO 1, C1)
A. Atomic number
B. Nucleon number
C. Avogadro’s number
D. Protonic identity

4. An atom X is 15 times heavier than 1/12th of the mass of carbon atom (C-12 isotopes) the mass X in
a.m.u unit is
A. 1.25
B. 15
C. 14
D. 12
(CLO 4, C3)

5. Which species below is the nitride ion?
A. Na+
B. NO3-
C. NO2-
D. N3-

(CLO 1, C1)
7

SUBJECTIVE QUESTIONS: HOUR 1 CHEMISTRY DK014
1. Why an atom is neutral? MATRIKULASI KPM
SISTEM EMPAT SEMESTER (S4S)

(CLO 1, C1)

2. Define; (CLO 1, C1)
(a) Isotopes.
(b) Proton number.
(c) Nucleon number.

3. An element X has a nucleon number of 65 and 35 neutrons in the nucleus. The ion derived from this
element has 28 electrons.

(a) Write the symbol of atom X (CLO 1, C2)
(b) Write the symbol of ion X (CLO 1, C2)

HOUR 2

4. An element Y has a nucleon number of 127 and 74 neutrons in the nucleus. The ion derived from
this element has 54 electrons.

(a) Write the symbol of atom Y (CLO 1, C2)
(b) Write the symbol of ion Y

(CLO 1, C2)

5. Fill in the blanks in the following table

Symbol of Number of Number of Number of Number of Net

element/ion proton electron neutron nucleon charge

11

26 +2
18 31 -3

79 118 +1
86 86

(CLO 1, C2 & CLO4, C3)

8

CHEMISTRY DK014
MATRIKULASI KPM
SISTEM EMPAT SEMESTER (S4S)

HOUR 3

6. Calculate the relative molecular mass of each of the following compounds.

(a) Ammonium nitrate, NH4NO3
(b) Oxalic acid, H2C2O4
(c) Hydrated copper(II) sulphate, CuSO4.5H2O
(d) Sodium hydrogen carbonate/ sodium bicarbonate, NaHCO3
(e) Calcium phosphate, Ca3(PO4)2

(CLO 1, C2)

7. Determine the relative atomic mass of an element Z if the atomic mass ratio of Z to carbon-12 is
1.17.
(CLO 1, C2)
HOUR 4

8. Define anion and cation. Give an example of each. (CLO 1, C1)
9. Name the ions and salts according to the IUPAC nomenclature.

(a) Cation : H3O+, Fe2+, Fe3+, Sn4+, Mn2+ and Pb2+
(b) Anion : ClO3-, C2O42-, MnO4-, CO32-, O2- and S2-
(c) Salt : AlCl3, NaHSO4, FeBr3, AgNO3, MgO and FeCrO4

(CLO 1, C1 & C2)

HOUR 5
10. Write the formulae for each of the following ionic compounds.

(a) Copper(I) cyanide (CLO 1, C2)

(b) Lead(II) carbonate
(c) Tin(II) fluoride
(d) Mercury(II) oxide
(e) Iron(III) oxide
(f) Aluminum hydroxide

9