Physical Sciences Grade 10 P2 North West June 2024 Memo

PROVINCIAL ASSESSMENT GRADE 10 PHYSICAL SCIENCES: CHEMISTRY (P2) JUNE 2024 MARKING GUIDELINES MARKS: 75 This marking guideline consists of 6 pages including the cognitive grid. Copyright reserved Please turn over

Physical Sciences/P2 2 NW/June 2024 Grade 10 - Marking Guidelines QUESTION 1 1.1 C ✓✓ 1.2 D ✓✓ 1.3 B ✓✓ 1.4 A ✓✓ 1.5 B ✓✓ [10] QUESTION 2 2.1 A substance that cannot be separated into simpler components by physical methods. ✓✓ (2) 2.2 2.2.1 Air ✓ (1) 2.2.2 Copper wire ✓ (1) 2.2.3 Bromine ✓ (1) 2.3 2.3.1 B ✓, C ✓, A ✓ (3) 2.3.2 Liquid ✓ (1) [9] Copyright reserved Please turn over

Physical Sciences/P2 3 NW/June 2024 Grade 10 - Marking Guidelines QUESTION 3 3.1 Atoms of the same element having the same atomic number/number of protons, but different mass number/number of neutrons. ✓✓ (2) 3.2 3.2.1 1s22s22p63s23p5 ✓✓ (2) 3.2.2 35(75,77) ✓+37(24.23) ✓ Mr (Cℓ) = 100 Mr (Cℓ) = 35,48 AMU ✓ (3) 3.2.3 7 ✓ (1) 3.2.4 3✓ (1) 3.3 3.3.1 Ca2+ 4s ✓ 3p 3s ✓✓ 2p 2s 1s (3) 3.3.2 Ca2+ and Cℓ- ✓ (2) 3.4 Energy needed per mole to remove an electron(s) from an atom in the gaseous phase. ✓✓ (2) 3.5 3.5.1 Lithium is a metal that has an electron in the second energy level (1 valence electron). ✓ Its first energy level is full. Fluorine has 7 electrons in its 2nd energy level (7 valence electrons). ✓ Lithium will rather donate and Fluorine will rather gain an electron. ✓ Therefore the difference in first ionisation energies. (3) 3.5.2 HIGHER THAN ✓ (1) [20] Copyright reserved Please turn over

Physical Sciences/P2 4 NW/June 2024 Grade 10 - Marking Guidelines QUESTION 4 4.1 A pure substance that consists of two or more non-metal atoms chemically bonded together through the sharing of electrons. ✓✓ (2) 4.2 Chemical change ✓ (1) 4.3 4.3.1 2H + O ✓ H O ✓✓ ✓ H (4) 4.3.2 Covalent bond ✓ (1) 4.3.3 HCℓ (aq) + MnO2 (s) ✓ MnCℓ2 (aq) + H2O (ℓ) + Cℓ2 (g) ✓ ✓ (bal.) Criteria: If no phases are indicated or any phase(s) are wrong max 2⁄3 (3) 4.4 4.4.1 Hydrogen sulphate ✓ (1) 4.4.2 Potassium chloride ✓ (1) 4.5 K+ ✓+ HSO4¯ ✓ KHSO4 ✓(balancing) (3) 4.6 Ionic bond ✓ (1) 4.7 (39 + 35,5) ✓+ (2(1)+32+4(16)) ✓ = (39+1+32+4(16)) ✓ + (1+35,5) ✓ 74,5 + 98 = 136 + 36,5 172,5 = 172,5 ✓ (5) [22] QUESTION 5 5.1 A mole of a substance is the same amount of particles as there is atoms in 12 g of the Carbon-12 isotope. ✓✓ (2) 5.2 5.2.1 M(Na2CO3) = 2(23)+12+3(16) ✓ = 106 g.mol-1 ✓ (2) 5.2.2 N(HCℓ) = nNA ✓ = 2 x 6,02 x 1023 ✓ = 1,204 x 1024 molecules ✓ ∴ 2 x 1,204 x1024 = 2,408 x 1024 atoms ✓ (4) Copyright reserved Please turn over

Physical Sciences/P2 5 NW/June 2024 Grade 10 - Marking Guidelines 5.2.3 POSITIVE MARKING FROM 5.2.1 m n = ✓ M 243,8 = ✓ 106 = 2,3 mol ✓ (3) 5.2.4 𝑉 n(CO2) = ✓ 𝑉𝑚 𝑉 1,15 = ✓ 22,4 V(CO2) = 25,76 dm3 ✓ (3) [14] TOTAL: 75 Copyright reserved Please turn over

Physical Sciences/P2 6 NW/June 2024 Grade 10 Marking Guidelines Copyright reserved