This document has a comprehensive assortment of past paper questions taken from Department Gr 10 Common Tests (years ). All the revision and exam prep you need are in one place! No need to search for the correct memorandum for each question as there is a neatly set-out memo that accompanies the boo...
1.1.1 Temperature is the measure of the average kinetic energy of the particles. (2)
1.1.2 Gaseous (1)
1.1.3 5℃ (1)
1.1.4 Condensation (1)
1.1.5 - As the temperature decreases kinetic energy of the molecules decrease. (2)
- Attractive forces between the molecules increase.
1.1.6 Solid (1)
1.2.1 Boiling point is the temperature of a liquid at which its vapour pressure
equals the external (atmospheric) pressure. (2)
1.2.2 Statement b. (3)
- Boiling is the change in phase of a liquid to a gas at a fixed temperature
- Evaporation is the change in phase of a substance from a liquid to a gas
at any temperature.
[13]
(June 2018 Q3)
2.1.1 B (1)
2.1.2 A (1)
2.1.3 Endothermic, in both processes heat energy was added. (2)
2.2 a) Hydrogen bromide (1)
b) Carbon tetrachloride (2)
c) Sodium thiosaphate (2)
2.3 a) 4Fe + 3O2 → 2Fe2O3 (2)
b) 2C2H6 + 7O2 → 4CO2 + 6H2O (2)
c) Na2SO4 + Ba(NO3)2 → BaSO4 + 2NaNO3 (2)
2.4 a) Matter cannot be created or destroyed but it is transformed from one form
to another. (2)
b) Mreactants = 2x1+2x14+2x3x16+40+2x16+2x1 = 160g.mol-1 (3)
Mproducts = 40 + 2x14+ 2x2x16 + 2x2x1 + 2x16 = 160g.mol-1
[20]
(June 2018 Q4)
2
,3.1.1 Atoms of the same element (having the same number of protons), with
different number of neutrons. (1)
3.1.2 Alkali Earth metals (1)
3.1.3 Neon/Ne (1)
3.1.4 N = 26 – 12 = 14 neutrons (1)
3.1.5 %25Mg = 100 – (78,99 + 11,01)
= 10% (1)
𝑀24 𝑀𝑔 𝑥 % 𝑎𝑏𝑢𝑛𝑑𝑎𝑛𝑐𝑒 𝑀25 𝑀𝑔 𝑥 % 𝑎𝑏𝑢𝑛𝑑𝑎𝑛𝑐𝑒 𝑀26 𝑀𝑔 𝑥 % 𝑎𝑏𝑢𝑛𝑑𝑎𝑛𝑐𝑒
3.1.6 R.A.M = + +
100% 100% 100%
23,985 𝑥 78,99 24,959 𝑥 10 25,983 𝑥 11,01
= + +
100% 100% 100%
= 24,302 g.mol-1 (4)
3.2.1 Molecule that consists of 2 atoms from the same element. (2)
3.2.2 2 (1)
3.2.3 The maximum of 2 electrons in an orbital provided that they spin in opposite
directions. (2)
3.2.4 1s22s22p4 (2)
3.2.5 Covalent bond (1)
[17]
(June 2018 Q5)
4.1 An ionic bond is a chemical bond whereby electron(s) are transferred from
one atom to the other. (2)
4.2 a) (2)
b) (2)
[6]
(June 2018 Q8)
5.1 a) Energy needed per mole to remove a mole of electrons from a mole of
atoms in a gaseous phase. (2)
b) As one moves down the group, First ionisation energy decreases. (2)
3
, OR as one moves up the group, First ionisation energy increases
5.2 Na has 1 unpaired electron in the 3s orbital. Mg has a pair of electrons in the
3s orbital. This represents greater stability. Therefore, more energy is needed
in Mg. (3)
5.3 a) Decreases (1)
b) Decreases (1)
[9]
(June 2017 Q2)
6.1 a) Homogenous (1)
b) One element and one compound
Oxygen is made up of the one type of atom.
Water is a chemical combination of different atoms. (3)
6.2.1 Diamond (1)
6.2.2 Iodine (1)
6.2.3 Sodium chloride (1)
6.2.4 Dry ice (1)
6.2.5 Magnesium oxide (1)
[9]
(June 2017 Q3)
7.1.1 B (1)
7.1.2 (2)
7.1.3 A (1)
7.1.4 C (1)
7.2 a) Hydrogen phosphide (2)
b) Zinc chlorate (2)
4
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