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Q1— Section header —
1.5Noble gases/Inert gases Ductile/Ductility Metallic (bond\ Oxygen Exothermic (5 [5]5
Q2— Section header —
2.55
Q3— Section header —
3.510
Q4— Section header —
4.515
Q5— Section header —
5.1.1The deformation of a material is directly proportional to the force applied on it provided the elastic limit is not exceeded (2\
5.1.2Y = 4,8 (1\
5.1.3Graph of length of extension versus load Marking guidelines: Label on x axis (Load/Force in N \ Label on y axis (Length of extension/distortion/elongation in cm\ 3. Accurate plotting of points 4. Straight line passing through the origin
5.1.4Yes (1\
5.1.5The graph is a straight line, passing through the origin (2\
5.2.1, 2s , 3s (3\
5.2.2Marking guidelines Shows 4 pairs of electrons (2\
5.2.3or Ca or K or K or Cl -1 or Cl 1- -3 or P
5.3.219
Q6— Section header —
6.1.1OPTION 1 PV = nRT (125\(3,6\ = n(8,31 \328 n = 0,17 mol OPTION 2 PV = nRT
Q6— Section header —
6.2.1The pressure of an enclosed mass of gas is directly proportional to the absolute temperature of the gas provided the volume is kept constant (2\ Marking guidelines: Equation LHS substitution
6.2.2
6.2.3Since R,V are constant The
Q7— Section header —
7.1.1Vapour pressure is the pressure exerted by a vapour in equilibrium with the liquid.
7.1.2Boiling point is the temperature at which the vapour pressure of a liquid is equal to the pressure in the atmosphere (2 (4\
7.2The temperature/kinetic energy increases. The particles begin to vibrate faster/more vigorously/more violently The particles of the solid are pushed further apart /The particles need more space to move about
7.3.2Hydrogen bonding Van der Waals forces /London forces/Dispersion forces (2 (2\
7.4.1Liquid (2\
7.4.2Because now the liquid is changing phase to solid A phase change occurs/takes place The particles come closer together Latent heat of fusion is released. The potential energy of the particles decrease
Q8— Section header —
8.1.1A catalyst is a chemical substance that speeds up/increases the rate of a (chemical\ reaction but remains unchanged/does not undergo any permanent chemical changes/is not consumed at the end of the reaction
8.1.2Enthalpy refers to the overall energy change in a reaction at constant pressure (2 (4\
8.2.3Exothermic Heat/energy is given off OH + 3O 2CO + 4H Reactants (1\ (2\ (3\
8.2.4(shape of the graph\ Marking guidelines For both labels (1 mark only\ Shape of graph Activation energy Heat of the eaction ( Position of reactants
8.3.1CaO + H O Ca(OH\ (1\
8.3.2Combination /Synthesis (2\
8.3.3=0, 0, mol (3\
8.3.4CaO + H O Ca(OH\ Relative molar mass of reactants = (40 + 16\ + (2 + 16\ = 56 = 74 Relative mola r mass of products = (40 + 32 + 2\ = 74 Since the relative molar mass of the reactants = the relative molar
Q9— Section header —
9.1.1(a\ (b\ (c\ (d\ Silver nitrate Sodium chloride Silver chloride Sodium nitrate (4
9.1.2OPTION 1 NaCl ,5 =0, =0, n= 0,
9.2.1+ 2KBr 2KCl + Br Marking guideline: 1 mark for each product Balancing Type of reaction: Displacement Balancing Type of reaction: Combination Marking guideline: 1 mark for each product
44.8dm / (8.31 273.15\ = 2 mol 2= OPTION 2
Q10— Section header —
10.1.1
10.1.2
10.1.3
10.2.410