Physical Sciences Grade 12 P2 KZN June 2024 Question Paper

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Downloaded from hlayiso.com Physical Sciences/P2 2 June 2024 Common Test NSC INSTRUCTIONS AND INFORMATION 13 Write your NAME in the appropriate spaces on the ANSWER BOOK. 2. This question paper consists of SEVEN questions. Answer ALL the questions in the ANSWER BOOK. 3. Start EACH question on a NEW page in the ANSWER BOOK. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Leave ONE line between two sub questions, for example between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. te You may use appropriate mathematical instruments. 8. Show ALL formulae and substitutions in ALL calculations. 9. Round off your final numerical answers to a minimum of TWO decimal places. 10. Give brief motivations, discussions et cetera where required. 11. You are advised to use the attached DATA SHEETS. 12. Write neatly and legibly. Copyright reservea Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 3 June 2024 Common Test NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A-D) next to the question number (1.1—1.6) in the ANSWER BOOK, for example 1.11 E. 1.1 1.2 1.3 Which ONE of the following general formulae is a saturated hydrocarbon? A CnHan Bo CrHan+1 C CnHan+2 D CnHen-2 (2) Which ONE of the following is the structural formula of the functional group of the ALDEHYDES? A B fe} fe} I I ie Cc pias H a -_ Cc D fe} | | I | H-— O — CG — —-c —cC —cC — | | | (2) A haloalkane is strongly heated in the presence of a concentrated strong base. The organic product is an... A Alkyne. B_ Alkene. C Alkane. D_ Alcohol. (2) Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 4 June 2024 Common Test NSC 1.4 Hydrogen gas is prepared in TWO experiments, EXPERIMENT 1 and EXPERIMENT 2 by adding hydrochloric acid to an excess of magnesium. The balanced equation for the reaction is: Mg(s) + 2HC&(aq) — Mg(Cf)2(aq) + H2(g) AH < 0 The same mass of magnesium and the same volume of hydrochloric acid is used in both experiments. The magnesium is completely covered by the hydrochloric acid in both experiments. The table below shows the results obtained for the TWO experiments: Time in minutes 1 2 3 4 EXPERIMENT 1 | Volume of hydrogen gas inom? | 20 | 30 | 35 | 35 EXPERIMENT 2 | Volume of hydrogen gas in cm? | 30 | 35 | 40 | 40 Which ONE of the following statements can be concluded from the results indicated in the table? A Ahigher concentration of HCf(aq) was used in EXPERIMENT 2. B_ Ahigher concentration of HCf(aq) was used in EXPERIMENT 1. C Powdered magnesium at a higher temperature was used in EXPERIMENT 2. D_ Powdered magnesium at a higher temperature was used in EXPERIMENT 1. = (2) 1.5 A reaction at equilibrium in a closed container is represented by the following equation: No(g) + 3H2(g) = 2NHa(g) AH < 0 Which ONE of the following changes will affect BOTH the value of Ke and the concentration of ammonia (NHs) at equilibrium? A_ Adding a suitable catalyst. B_ Reducing the temperature. C Increasing the mass of nitrogen. D Increasing the pressure at constant temperature. (2) 1.6 Which ONE of the following aqueous solutions will have the LOWEST hydrogen ion [H*] concentration? A 0,1 moldm* HC B 0,1 mol'dm? HNO3 C 0,1 moldm? H2SO4 D 0,1 mol'dm* CHsCOOH (2) [12] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 5 NSC QUESTION 2 (Start on a new page.) June 2024 Common Test The letters A to E in the table below represent four organic compounds. A | 2,3-dichloro-3-ethyl-4-methylheptane |B | CHsCH2C(CH3)OHCH3 hexanoic acid D H | H — C — H on fl i sales ele Nei ak ak Ma H H H H—C—H | | H—C —C —H H | | H H 2.1 Write down the IUPAC name of: 2.1.1 B 2.1.2 D (2) (2) 2.2 Classify compound B as a PRIMARY, SECONDARY or TERTIARY alcohol. Give a reason for the answer. 2.3. Write down the: 2.3.1. Structural formula for compound A. 2.3.2 EMPIRICAL FORMULA for compound C. Copyright reserved (3) (3) (2) [12] Please turn over

Downloaded from hlayiso.com June 2024 Common Test Physical Sciences/P2 6 NSC QUESTION 3 (Start on a new page.) Learners use two compounds A and B, to investigate a factor which influences the boiling point of organic compounds. The results are recorded in the table below. Condensed structural formula BOILING POINT (°C) A CHs(CH2)3CHO 103 B CHs(CH2)2COOH 163 3.1. Define boiling point. (2) 3.2 Which compound A, or B has a higher vapour pressure? Use the information in the table to give a reason for the answer. 3.3 For this investigation, write down the: 3.3.1 Dependent variable. 3.3.2 Independent variable. 3.4 Fully explain the difference in the boiling points shown in the table. (2) (1) (1) (5) The boiling point of a third compound C, with molecular formula CsH12O is determined under the same conditions and compared to the boiling points of compound A and B. 3.5 How will the boiling point of compound C compare to that of compound: (Write down HIGHER THAN, EQUAL TO or LOWER THAN) 3.5.1 A? 3.5.2 B? , Copyright reserved (1) (1) [13] Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 y June 2024 Common Test NSC QUESTION 4 (Start on a new page.) In the flow diagram below, 1, 2, 3, and 4 represent organic reactions. P, Q, R, S and T represent organic compounds. Q CHsCH2CHBrCHs Pentel a 4 vy Ss (minor product) * Treo) CeH1202 4.1 Reaction 2 is a HYDROLYSIS reaction. 4.1.1. Name the type of reaction that takes place. Choose from ADDITION, SUBSTITUTION or ELIMINATION. (1) 4.1.2 Using molecular formulae, write a balanced equation for reaction 2. (3) 4.2 Reaction 4 occurs in the presence of steam and phosphoric acid to produce compound S. Name the type of reaction that takes place. (1) 4.3. For compound P write down the: 4.3.1 Name of the homologous series to which it belongs. (1) 4.3.2 Structural formula for compound P. (2) 4.3.3 Structural formula for a chain isomer of compound P. Fully explain the answer. (5) When Compound S and Compound T are heated together with some concentrated sulphuric acid, CeH1202, is produced. 4.4. Write down the IUPAC name of compound T. (1) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com | Physical Sciences/P2 8 June 2024 Common Test NSC QUESTION 5 (Start on a new page.) During an experiment, hydrogen gas is produced from reacting 600 cm? of hydrochloric acid of unknown concentration with a piece of magnesium ribbon at a temperature of 50 °C. The balanced equation for the reaction is: Mg(s) + 2HC&(aq) — Mg(Cf)a(aq) + Ha(g) AH < 0 The hydrochloric acid is the limiting reagent, and the magnesium ribbon is completely covered by the acid solution. The following observation is made after 12 minutes: The volume of hydrogen gas remains unchanged. 5.1 The average rate of the reaction given above is 15 cm*-min". 5.1.1 Define rate of the reaction. (2) 5.1.2 Give a reason why increasing the length of the magnesium ribbon will not influence the results of above experiment. (1) 5.1.3. Calculate the concentration of the hydrochloric acid. Take the molar volume of the gas at 50 °C to be 26 490 cm3.molt (8) 5.2 The experiment, is NOW, repeated. However, the magnesium ribbon is replaced with an equal mass of powdered magnesium. How will this change affect the: 5.2.1. final volume of hydrogen gas produced? Choose from INCREASES, REMAINS THE SAME or DECREASES. (1) 5.2.2 Fully explain the answer to question 5.2.1 in terms of the collision theory. (4) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 9 June 2024 Common Test NSC QUESTION 6 (Start on a new page.) 6.1 An unknown gas, Az, is sealed in a container and allowed to form Bs gas at 500 °C. The reaction reaches equilibrium according to the following balanced equation: 3Aa(g) = 2Bs(g) 6.1.1 Explain what is meant by the underlined words. (2) The reaction mixture is analysed at regular intervals. The results obtained was used to sketch (not to scale) the graph below of concentration versus time. Concentration (mol-dm>) The reaction is NOW repeated at a NEW temperature. The curves indicated by the continuous dark lines were obtained at the NEW temperature. Concentration (mol:dm') > Time (s) 6.1.2 State Le Chatelier’s Principle. (2) 6.1.3 Is the forward reaction EXOTHERMIC or ENDOTHERMIC. Fully explain the answer. (3) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P2 10 June 2024 Common Test NSC 6.2 A mixture of 120 g of nitrogen oxide gas (NO), 80 g of oxygen gas (Oz) and an unknown number of moles of nitrogen dioxide gas (NOz) are sealed in a 500 cm? flask at 100 °C. The reaction reaches equilibrium according to the balanced equation below: 2NO(g) + O2(g) = 2NO2(Qg) When equilibrium was established, it was found that the concentration of O2(g) present in the container was 4,25 mol.dm’. The equilibrium constant, Kc for this reaction at 100 °C is 0,25. Calculate the unknown number of moles of NO2(g) that was initially sealed in the container. (8) [15] QUESTION 7 (Start on a new page.) 7.1 Two separate reactions, P and Q are represented by the balanced equations below: P: 2HNOs(aq) + NazCOs(aq) — 2NaNOs(aq) + CO2(g) + H2O(t) Q: H2SO.(aq) + H20(t)—> HSO; (aq) + Hs0*(aq) 7.1.1. Write down the formula of the acid in reaction Q. (1) 7.1.2 Give a reason for the answer to question 7.1.1 by referring to the Lowry-Bronsted theory for acids and bases. (1) 7.1.3 Write down the formula of the species from either reaction P or reaction Q other than H20 which is an ampholyte. (1) 7.1.4 Write down the formula of the conjugate acid of the species identified in question 7.1.3 (1) Copyright reserved Please tum over

Downloaded from hlayiso.com Physical Sciences/P2 1 June 2024 Common Test NSC 7.2 The table below shows some common indicators and the pH range in which the indicator will CHANGE COLOUR. Indicator pH range when a colour change takes place Methyl orange. 3,1-4,4 Bromothymol blue 6,0 -7,6 Phenolphthalein 8,3-10 7.2.1 Define the term endpoint. (1) 7.2.2 Write down the name of the indicator that is suitable to identify the endpoint for reaction P. (1) 7.2.3. Explain the answer to question 7.2.2 (2) 7.3 An impure sample of potassium hydroxide pellets (KOH), of mass 8 g was dissolved in 175 cm? of a 1,20 mol'dm® nitric acid (HNOs) solution. The nitric acid solution is in excess. HNOs(aq) + KOH(s) — KNOs(aq) + H2O(£) 25 cm® of the resulting solution was then titrated using 12,94 cmé of a standard 0,65 mol'dm® sodium carbonate (NazCQOs) solution. 2HNOs(aq) + NazCOs(aq) — 2NaNOs(aq) + CO2g) + H2O0(t) Calculate the percentage purity of the potassium hydroxide sample. (10) [18] TOTAL MARKS: [100] . Copyright reserved Please turn over

Downloaded from hlayiso.com June 2024 Common Test Physical Sciences/P2 1 NSC DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE lene pier ada ar Vim 22,4 dm3-mol* TABLE 2: FORMULAE/TABEL 2: FORMULES N m n=— n=— M Na n m eM, c=, or/of a) i. Cae: 2 Oe H = -log[H3O* CV, My PH = -log[Hs0*] Kw = [H3O*][OH’] = 1 x 10-4 at/by 298 K Copyright reserved Please turn over

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