Physical Sciences Grade 10 P2 Gauteng June 2024 Memo (Eng)

Downloaded from hlayiso.com PROVINCIAL EXAMINATION JUNE 2023 GRADE 10 MARKING GUIDELINES PHYSICAL SCIENCES (CHEMISTRY) (PAPER 2) 4 pages

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) MARKING GUIDELINES (Paper 2) GRADE 10 QUESTION 1: MULTIPLE-CHOICE QUESTIONS 1.1 D  (2) 1.2 C  (2) 1.3 C  (2) 1.4 A  (2) [8] QUESTION 2 2.1 A compound is a pure substance consisting of two or more different elements.  (2) 2.2 2.2.1 Homogeneous mixture  (1) 2.2.2 The mixture of uniform composition in which all the components are in the same phase.  (2) 2.2.3 Crystallisation  (1) [6] QUESTION 3 3.1 The temperature at which a solid, given sufficient heat, becomes a liquid.  (2) 3.2 Solid  (1) 3.3 Boiling/Evaporation  (1) 3.4 The temperature is constant, meaning that the solid is changing into liquid.  The kinetic energy stays constant.  The potential energy is increasing. (2) 3.5 H2O  (1) [7] 2

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) MARKING GUIDELINES (Paper 2) GRADE 10 QUESTION 4 4.1 Atoms of the same element having the same number of protons, but different numbers of neutrons.  (2) 4.2 8 (1) 4.3 (2) 4.4 1s2 2s2 2p2  (2) [7] QUESTION 5 5.1 2H2 + O2 → 2H2O  (2) 5.2 gas  (1) 5.3 5.3.1  (2) 5.3.2  (2) 5.4 exothermic  (1) 5.5 M(H2O) = 2(1) + (16) = 18 g·mol-1  (2) [10] 3

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) MARKING GUIDELINES (Paper 2) GRADE 10 QUESTION 6 6.1 Aqueous solution or a solution where water is the solvent.  (1) 6.2 One mole is the amount of substance having the same number of particles as there are atoms in 12 g carbon-12.  (2) 6.3 6.3.1 m 30 n   = 0,065 mol PbI2  M 461  n(PbI2) : n(I-) 1 : 2 0,065 : 0,13 mol I- N N n  0,31  N = 1,866 x 1023 I- NA 6,02  10 23  (6) 6.3.2 n(PbI2) : n(KI) 1 : 2 0,065 : 0,13 mol KI m m n  0,13  m = 21,58 g KI  M 166  (3) [12] TOTAL: 50 4