Physical Sciences Grade 12 P2 Limpopo June 2025 QP

DoE/June 2025 NSC gang, LIMPOPO PROVINCIAL GOVERNMENT REPUBLIC OF SOUTH AFRICA DEPARTMENT OF EDUCATION NATIONAL SENIOR CERTIFICATE PHYSICAL SCIENCES (PHYSICS) PAPER 2: MAY - JUNE 2025 MARKS: 150 TIME: 3 Hours This paper consist of 13 pages including the Data Sheets NB Be careful of the MISSING Data in paper Copyright reserved Please turn over

Physical Sclences/P2 LimpopoDoE/June 2025 NSC QUESTION 1 Four possible 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 - 1.10 in the ANSWER BOOK, e.g. 1.11 E. 1.1 Which one of the following compounds is not an ester? A C3HsOz B C2Hs02 2) CaHeO2 4.2 In which ONE of the following options are the three compounds arranged in order of increasing boiling points? A | CHsCH2GOOH CHsCH2CH2CH2CHs _| CHsCH2CH2CH2OH B | CHsCH2CH2CH20H _ | CHsCH2CH2CH2CH3_| CHsCH2COOH C | CHsCH2CH2CH2CHa_| CHsCH2CH2CH20H ___| CHsCH2COOH D | CHsCH2CH2CH2CHs_| CHsCH2COOH CHsCH2CH2CH20H (2) 1.3 Which of the following reactions can be used to prepare ethane from octane? A Addition B Hydrogenation c Cracking (2) D Substitution 14 The molecular formula of 1,2-dichlorobutane is: A CaHisCt B CsHsCt Cc CaHsChe (2) D CeHsCla 1.5 According to the Collision Theory, reaction rate increases if there is: A Decrease in temperature. B Decrease in activation energy. c Decrease in concentration. (2) D Decrease in kinetic energy of molecules. 16 Which one of the following statements correctly describes the characteristics of an endothermic reaction? A AH is positive and the products have less energy than the reactants. B AH is positive and the products have more energy than the reactants. Cc AH is negative and the products have less energy than the reactants. D _ AHis negative and the products have more energy than the reactants. (2) Copyright reserved Please turn over

Physical Sclences/P2 LimpopoDoE/June 2025 NSC A system Is at chemical equilibrium. Which of the following will change as the temperature of the equilibrium mixture is changed? (i) Total mass of reactants and products, (ii) Ke value, (iii) Rate of the reverse reaction. A (i)only B (i) and (ili) only C (ii) and (iii) only (2) D (i), (il) and (ili) Consider the balanced chemical equation for the following reaction in equilibrium. 2NO2iq) = N2O4iq) The equilibrium constant, Ke, for this reaction is 170,3 at 30°C. What is the equilibrium constant for the reverse reaction? A 1703 Ds 170,3? (2) Which one of the following Is true for an acidic solution at 25°C? A __ It contains both H30* fons and OH" ions. B_ It contains H30* ions only. C It contains OH Ions only. D It contains neither H30* ions nor OH" ions. (2) Which one of the following is a strong acid? A H20. B HBr. Cc H2S. (2) D CHsCOOH. [20]

Physical Sciences/P2 LimpopoDoE/June 2025 NSC QUESTION 2 2.1. The letters A to G in the table below represent seven organic compounds. A B Cc But-1-ene 1-bromopropan-2-one | Propanoic acid [?) E F CHs CHCH2CH3 ij en, 9 \ CHs — ° -CHs OH G # tt iL? CHsCH2C(CHs)2CCH H H Br \ 2.1 Write down the LETTER(S) which represents: 2.1.1. An alcohol. (1) 2.1.2 Acarboxylic acid. (1) 2.1.3. A positional isomer of but-2-ene. (1) 2.1.4 A product formed by the hydrolysis of a haloalkane. (1) 2.1.5 Unsaturated compound(s). (2) 2.1.6 Acompound with a formyl functional group. (1) 2.1.7 Acompound with a pleasant smell. (1) 2.2 Write down the IUPAC name of: 2.2.1 Compound D. (2) 2.2.2 Compound F. (3) 2.2.3 Compound G, (2) 2.2.4 Compound H. (3) 2.3 Write down the structural formula of: 2.3.1 Compound A. (2) 2.3.2 Compound C. (2) 2.4 Write down: 2.4.1 The molecular formula of a functional isomer of compound E. (1) Copyright reserved Please turn over

Physical Sclences/P2 LimpopoDoE/June 2025 NSC 2.4.2 The structural formula of the functional group of compound B. (1) 2.4.3. The condensed structural formula of the acid that was used to make (2) compound E. 2.4.4 Name of the alcohol used for the preparation of compound E. (1) 2.4.5 The name of the functional group of compound G. (1) 2.4.6 The homologous series to which compound H belongs. (1) [29] 1UESTION 3 Five carboxylic acids represented by the letters A to E are listed in the table below. A Butanoic acid : D 3-methylpentanoic acid B Hexanoic acid E 2,2-dimethylbutanoic acid c Octanoic acid Leamers conduct an investigation fo compare the boiling points of the first three carboxylic acids (A, B and C) in the table above. 3.1.1 Define the term “boiling point”. (2) 3.1.2 Name one MAIN item of apparatus they used in their investigation. (1) State for this investigation: 3.2.1 The independent variable. (1) 3.2.2 The dependent variable. (1) 3.2.3. Asuitable hypothesis. (2) The boiling point of compound B is higher than the boiling point of compound A. Which intermolecular force(s) is/are responsible this 2) difference? ( Which one of D or E has the higher vapour pressure at room (1) temperature? Refer to the intermolecular forces in D and E to explain your answer in 3.4 (3) [13]

Physical Sciences/P2 LimpopoDoE/June 2025 NSC QUESTION 4 Under the appropriate reaction conditions, 2-chlorobutane can be converted to but- 2-ene and but-2-ene can be converted back to 2-chorobutane. The flow diagram below illustrates a method to do this. Step 1 Butan-2-ol Step 2 2-chlorobutane = ke Steps But-2-ene 41 Is 2-chlorobutane a PRIMARY, SECONDARY or TERTIARY haloalkane? —(3) Give a reason for your answer. 4.2 Name the type of reaction taking place in Step 1. (2) 4.3 Use condensed structural formulae to write a balanced chemical equation (3) for the reaction taking place in Step 2. 44 Write down the reaction conditions for Step 1. (2) 4.5 Write down the NAME and FORMULA of an acid catalyst that can be used (2) in the Step 2. 4.6 Write down the type of addition reaction that takes place in step 3. (1) [13] QUESTION 5 When excess dilute HC? is used to dissolve 1,00 g of powdered CaCOs(s) in a beaker in an experiment on reaction rate, the following reaction takes place: CaCOsa(s) + 2HCt(aq) > CaCt(aq) + H20(t) +COa(g) The results obtained are summarised in the table below: Mass of beaker, HCf 31,0 | 30,60 | 30,3 | 30,1 | 30,0 | 30,0 and CaCOx(s) (g) Time (s) 0 10 20 |30 |40 | 50 5.1 Define the term ‘limiting reagent’. (2) 5.2 The “excess HC?” does not influence the results, Give a reason for this. (1) 53 Calculate the amount of CaCOsa(s) that was used up in the first 10s of the (3) reaction in moles. 5.4 Write down the amount of CaCt2(s) that was produced in the first 10s of (1) the reaction. 5.5 Use your answer in 5.3 to calculate the rate of the reaction in the first 10s (3) in mol.s*. 56 Calculate the volume of CO2(g) that was collected at STP in this (4) experiment. Copyright reserved Please turn over

Physical Sciences/P2 101 mo03 LimpopoDoE/June 2025 NSC When the dilute HC! is replaced by concentrated HCf, the rate of the reaction between HC? and CaCOs increases. Use the collision theory to (3) explain this observation. ‘The same experiment was repeated using CaCOs granules instead of powder. How does the reaction rate compare with the first experiment? Choose from INCREASES, DECREASES or REMAINS THE SAME. Explain your answer. (3) After 40s, mass of the beaker and its contents remains the same. Explain why. (1) “The Maxwell-Boltazmann curve labelled A shows the distribution of molecular energies in 0,4-mol of nitrogen gas (Nz) at STP. Number of molecules ee a > Which of the curves B, C or D represents 0,4 mol of nitrogen gas at a (1) lower temperature? Which of curves B, C or D represents 0,8 mol of nitrogen gas at STP? (1) Explain your answer to 5.10.2 above. (3) [26]

Physical Sciences/P2 QUESTION 6 6.1 6.2 6.3 LimpopoDoE/June 2025 NSC x moles of SO2(g) and 40g of O2(g) are injected into a 500cm’ container at 450°C. The container is then sealed and the following equilibrium is established: 2S02(g) + O2(g) = 2SO03(g) AH =-198 kJ An analysis of the reaction mixture showed that the concentration of O2(g) at equilibrium was 1,5 mol.dm-°. The Ke value for this reaction at 450°C is 42,67. Calculate the initial number of moles (x) of SOz. (8) Changes are made to the equilibrium at times ti and tz respectively, as shown in Concentration (mol.dm?) 6.2.1 6.2.2 6.2.3 the concentration versus time graph below. [SO2] 1 cease Eat ne [02] sine ea <n lil th th Time Identify the change that was made to the equilibrium at: ti (2) tz (2) Give an explanation for your answer in Question 6.2.2 using Le Chatelier’s (4) principle. 6.3.1 6.3.2 6.3.3 Potassium dichromate is a salt that dissolves in water to establish the following equilibrium. CreO7? + H2O = 2CrOg? + 2H* Orange Yellow Explain what is meant by the term ‘closed system’ as applied to chemical (2) equilibrium. Sodium hydroxide is added to the orange solution. What observation is (1) made upon this addition? Explain your answer to Question 6.3.2 using Le Chatelier’s principle. (3) [22]

Physical Sciences/P2 LimpopoDoE/June 2025 NSC {QUESTION 7 Define an acid according to the Lowry Bronsted theory. 3,65.g of HC&X(g) are dissolved in 200 cm? of distilled water to prepare an acidic solution. The final temperature of the mixture is 25°C. The balanced equation for the reaction taking place is: HCt + HO — Ch + Hs0* (2) “72:1 Write down the conjugate acid-base pairs in this reaction. (2) 7.2.2 Define an ampholyte. (2) “7.2.3. Write down the formula of a substance in the reaction given above, which (1) can act as an ampholyte. “7.24 Identify the:substance in the reaction that gives the solution its acidity. (1) 7.25 (Calculate the concentration of the HC? solution prepared. (3) “72236 Calculate the pH of the HCf. solution. (3) 1;68g of pure MgCO:(s) are dissolved completely in 39cm? of HNOs. “The: chemical equation for the reaction that takes place is: MgCOsa{s) + 2HNOs(aq) ~> Mg(NOa)2(aq) + CO2(g) + H20(¢) The excess HCf neutralizes exactly 25cm? of a NaOH solution. 15cm? of the same NaOH solution neutralized 12cm? of the initial HNOs. -7:3:1 Write down:a balanced chemical equation for the reaction of sodium (3) hydroxide and nitric acid. 73:2 Calculate the concentration of the original solution of HNOs. (10) [27] GRAND TOTAL = [150]

Physical Sciences/P2 LimpopoDoE/June 2025 NSC NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT 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 SYMBOLISIMBOOL | VALUE/WAARDE pm i “ p* 1,013 x10 Pa Lede casi ty aTD Vn 22,4 drm Secharenermul 7 273K TABLE 2: FORMULAE/TABEL 2: FORMULES a aoe lice Vv Bey ele El Be Ege Eh c= | Eta = Enacim ~ Etat ! Esy = Eman ~ Ess Fla Coaatarsint ~ Reasageait:! est Face i =|

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