Physical Sciences Grade 10 P2 Gauteng November 2020 QP (Eng)

Downloaded from hlayiso.com GAUTENG DEPARTMENT OF EDUCATION PROVINCIAL EXAMINATION NOVEMBER 2020 GRADE 10 PHYSICAL SCIENCES (CHEMISTRY) PAPER 2 TIME: 1½ hours MARKS: 70 7 pages, 1 data sheet and 1 periodic table b.o.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 2 GRADE 10 PAPER 2 INSTRUCTIONS AND INFORMATION 1. Write your name on the ANSWER SHEET. 2. This question paper consists of SEVEN questions. Answer ALL the questions in the ANSWER BOOK. 3. Number the answers correctly according to the numbering system used in this question paper. 4. You may use a non-programmable calculator. 5. You may use appropriate mathematical instruments. 6. You are advised to use the attached DATA SHEETS. 7. Show ALL formulae and substitutions in ALL calculations. 8. Round off your FINAL numerical answers to a minimum of TWO decimal places. 9. Give brief motivations, discussions, et cetera where required. 10. Write neatly and legibly. P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 3 GRADE 10 PAPER 2 QUESTION 1: MULTIPLE CHOICE QUESTIONS Various options have been provided as possible answers to the following questions. Choose the answer and write only the letter (A – D) next to the question numbers (1.1 to 1.5) in the ANSWER BOOK, e.g. 1.6 D. 1.1 Air can be classified as a/an… A homogeneous mixture. B element. C heterogeneous mixture. D compound. (2) 1.2 According to the Kinetic Molecular Theory the particles of a solid ... A vibrate in their fixed positions and have a fixed shape. B are free to move and are compressible. C are free to move and have a fixed shape. D vibrate in their fixed positions and are compressible. (2) 1.3 Which one of the following electron configuration notations represent an ion of a halogen? A 1s2 2s2 2p6 3s2 B 1s2 2s2 2p6 3s2 3p6 C s2 2s2 2p6 3s2 3p5 D 1s2 2s2 2p6 3s2 3p1 (2) 1.4 There are … atoms of hydrogen in 2 moles of NH3. A 5 x 1023 B 3,1 x 1023 C 3,61 x 1024 D 4 x 1023 (2) 1.5 The percentage hydrogen in C2H4 is … A 4 %. B 85, 71 %. C 66,67 %. D 14,29 %. (2) [10] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 4 GRADE 10 PAPER 2 QUESTION 2 2.1 The heating curve of a substance is shown below. Temperature Time (minutes) 2.1.1 Write down the physical state of the substance at t = 15 minutes. (1) 2.1.2 What is the boiling point of any substance? (2) 2.1.3 Give the value and unit of the freezing point for the substance in the graph. (2) 2.1.4 How will the average kinetic energy of the particles of this substance be affected between: (a) t = 0 minutes and t = 5 minutes (1) (b) t = 5 minutes and t = 10,5 minutes (1) (Write down only INCREASE, DECREASE or REMAINS THE SAME.) 2.1.5 Refer to the Kinetic Molecular Theory to fully explain the answer to QUESTION 2.1.4 (b). (3) [10] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 5 GRADE 10 PAPER 2 QUESTION 3 3.1 Complete the table below. Write only the answer next to the question number (3.1.1 – 3.1.5). Element Atomic Mass Number of Number of Number of number number protons neutrons electrons Potassium 19 39 3.1.1 3.1.2 3.1.3 Magnesium 12 3.1.4 12 12 3.1.5 ion (5) 3.2 Lithium occurs as two isotopes in nature. 7 % lithium-6 atom and 93 % lithium-7 atom. 3.2.1 Define the term isotopes. (2) 3.2.2 Calculate the relative atomic mass of lithium. (3) [10] QUESTION 4 Magnesium reacts with chlorine gas to form magnesium chloride. 4.1 Define the term ionic bond. (2) 4.2 Write down the chemical formula of magnesium chloride. (2) 4.3 For the chlorine atom: 4.3.1 Draw the Aufbau diagram. (3) 4.3.2 Write down the valence electrons. (1) 4.4 Write down the electron configuration notation (sp notation) of magnesium. (2) 4.5 Show the formation of magnesium chloride by using the Lewis dot diagrams. (4) [14] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 6 GRADE 10 PAPER 2 QUESTION 5 The empirical formula of a certain compound needs to be determined. The compound has 62,5 % of Pb; 8,45 % of N and 29,05 % of O. 5.1 Define the term empirical formula. (2) 5.2 Determine the empirical formula of this compound. (6) [8] QUESTION 6 Consider the following chemical reactions. A: SO2(g) + O2 → SO3(g) B: KCℓO3(s) → KCℓ(s) + O2(g) C: Aℓ + Fe2O3 → Al2O3(s) + Fe(s) D: C2H6(g) + O2(g) → CO2 + H2O(g) E: 2NaBr(aq) + Cℓ2(g) → 2NaCℓ(aq) + Br2(ℓ) 6.1 Balance equations A, B, C and D by writing out the full equation in your answer sheet. (4) 6.2 State the Law of constant composition. (2) 6.3 Show by calculation that the mass is conserved in reaction E. (5) [11] P.T.O.

Downloaded from hlayiso.com QUESTION 7 33,5 g sodium carbonate reacts with 500 cm3 hydrochloric acid according to the balanced equation. Na2CO3(s) + 2HCℓ(ℓ) → 2NaCℓ(aq) + CO2(g) + H2O(g) HCℓ Thistle funnel Double bore cork CO2 gas Na2CO3 Lime water 7.1 What does (aq) mean? (1) 7.2 Calculate the number of moles of sodium carbonate. (3) 7.3 By using the mole ratio of the reactants, determine the number of moles of the 500 cm3 hydrochloric acid that reacted completely with the 33,5 g sodium carbonate. (2) 7.4 What is the function of the lime water shown in die diagram? (1) [7] TOTAL: 70 END

Downloaded from hlayiso.com DATA FOR PHYSICAL SCIENCES GRADE 10 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 10 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTSI/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL | VALUE/WAARDE tvcgadho tonetante Na 6,02 x 10 mor" nai op citation e 16x 10°C Ben mass me 9,11. x 107" kg Moir gaovolane by STD Vn 22,4 dm?-mor" TABLE 2: FORMULAE/TABEL 2: FORMULES m Vv n=— or/of n=—- n= M Vm

Downloaded from hlayiso.com THE PERIODIC TABLE OF ELEMENTS DIE PERIODIEKE TABEL VAN ELEMENTE