Physical Sciences Grade 10 P2 Gauteng June 2019 Memo (Eng)

Downloaded from hlayiso.com GAUTENG DEPARTMENT OF EDUCATION PROVINCIAL EXAMINATION JUNE 2019 GRADE 10 PHYSICAL SCIENCES PAPER 2 MARKING GUIDELINE 6 pages

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINE Paper 2 GR 10 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION PHYSICAL SCIENCES (Paper 2) MARKING GUIDELINE QUESTION 1: MULTIPLE CHOICE QUESTIONS 1.1 B (2) 1.2 C (2) 1.3 C (2) 1.4 B (2) 1.5 B (2) 1.6 D (2) 1.7 A (2) 1.8 C (2) 1.9 A (2) 1.10 D (2) [20] QUESTION 2 2.1 Heterogeneous mixture as a mixture of non-uniform composition and of which the components can be easily identified (2) 2.2 Element is a pure substance consisting of only one type of atom and particles cannot be broken down any further.  Compound is a pure substance consisting of two or more types of atoms that are chemically bonded.  (4) 2.3 2.3.1 (a) Evaporation  (b) Filtration (c) Sand  (d) Sugar solution / sugar and water (4) 2.3.2 Physical (process)  (1) 2.3.3 No new substance is formed / water changes phase (1) [12] 2

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINE Paper 2 GR 10 QUESTION 3 3.1 What is the effect of an increase in temperature over a period of time?  NOTE:  The dependent and independent variable must be mentioned. The relationship between the variables must be identified. The question should not be answered with a Yes or No. (2) 3.2 3.2.1 TIME (1) 3.2.2 TEMPERATURE  (1) 3.3 On the graph paper:  Correct scale for both axes   Both axes labelled with units   3 points correctly plotted  (5) 3.4 All the energy is used to overcome the intermolecular forces between the molecules  (2) [11] 3

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINE Paper 2 GR 10 QUESTION 4 4.1 Isotopes are atoms of the same element having the same atomic number but a different mass number OR Isotopes are atoms of the same element having the same number of protons but different numbers of neutrons  (2) 4.2 Ar (Br) = = 80 (4) 4.3 4.3.1 10  4.3.2 12  4.3.3 17  4.3.4 18,5  4.3.5 Aℓ (Aluminium)  4.3.6 13  (6) [12] QUESTION 5 5.1 5.1.1 Electrons in the outermost energy level of an atom  (2) 5.1.2 4 (1) 5.1.3 1s22s22p63s23p2  (2) 5.1.4 Silicon  (Si)  (2) 5.2 2p     2s   1s   (3) [10] 4

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINE Paper 2 GR 10 QUESTION 6 6.1 S(s) +  O2(g)  SO2(g)  Bal  NOTE: Reactants  products balancing  (3) 6.2 6.2.1 It is correct (1) 6.2.2 S(s) + O2(g)  SO2(g) 32 + 2(16) = 32 + 2(16)  32 + 32 = 32 + 32 64 = 64  (4) 6.3. Covalent bonding (2) [10] QUESTION 7 7.1.1   XX -1 +2 XX Mg XX Cl 2 XX Oxidation numbers correct  (3) 7.1.2 Nitrogen with 5 electrons Hydrogen with one structure correct XX H Xo N Xo H Xo H (3) 5

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINE Paper 2 GR 10 7.1.3  XX -1 XX F XX XX (1) 7.2 7.2.1 Sodium oxide  (2) 7.2.2 Hydrogen peroxide   (2) 7.3 7.3.1 K2SO4 (1) 7.3.2 Fe Cℓ3  (1) 7.4 N2(g) + 3H2(g) 2 NH3 (g) (2) 7.5 Synthesis  (reaction) (1) [16] QUESTION 8 8.1 Electronegativity is the measure of the attractive force of an atom for the bonding pair of electrons.  (2) 8.2 8.2.1 Ionisation energy increases from left to right across the periodic table.  (2) 8.2.2 Non-metals have higher first ionisation energy than metals therefore non-metals would gain electrons to form negative ions (anions) (2) 8.2.3 When sodium loses its first electrons it attains a stable electron configuration hence more energy is needed to remove the second electron  (2) 8.2.4 increases (1) [9] TOTAL SECTION B: 80 TOTAL: 100 6