Gr 10 Physical Sciences P2 (English 2023 Question Paper_hlayiso.com_.pdf

Downloaded from hlayiso.com PROVINCIAL EXAMINATION NOVEMBER 2023 GRADE 10 PHYSICAL SCIENCES: CHEMISTRY PAPER 2 TIME: 2 hours MARKS: 100 10 pages + 2 data sheets P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 2 (PAPER 2) GRADE 10 INSTRUCTION AND INFORMATION 1. Write your name in the appropriate space on the ANSWER BOOK. 2. This question paper consists of SEVEN questions. Answer ALL the questions. 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. Write neatly and legibly. 6. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. You are advised to use the DATA SHEETS that are attached. 9. Show ALL formulae and substitutions in ALL calculations. 10. Round-off your FINAL numerical answers to a minimum of TWO decimal places. P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 3 (PAPER 2) GRADE 10 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 numbers (1.1 to 1.9) in the ANSWER BOOK, e.g. 1.10 D. 1.1 Which of the following solids consist of a lattice of positive ions in a “sea” of delocalised electrons? A Ice B Iodine C Diamond D Potassium (2) 1.2 The chemical properties of an element are determined by the number and arrangement of the element’s … A atoms. B protons. C electrons. D ions. (2) 1.3 An atom X forms an ion X+. The atom X and ion X+ have the same … A number of electrons. B atomic radius. C ionisation energy. D number of protons. (2) 1.4 Metal M forms a nitrate with the formula MNO3. Which of the following formulae for compounds of M is NOT correct? A M2SO4 B MCℓ C M(OH)2 D M2CO3 (2) 1.5 Which of the following represents the electron configuration of an alkaline- metal ion? A 1s2 B 1s2 2s2 C 1s2 2s2 2p5 D 1s2 2s2 2p6 3s1 (2) P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 4 (PAPER 2) GRADE 10 1.6 Which of the following equations represents a chemical change? A H2O(s) → H2O(ℓ) B 2H2O(ℓ) → 2H2(g) + O2(g) C NaCℓ(s) → Na+(aq) + Cℓ-(aq) D CO2(s) → CO2(g) (2) 1.7 The percentage water in MgSO4∙7H2O is: A 51,22 B 48,78 C 21 D 7 (2) 1.8 All of the following consist of approximately one mole of particle EXCEPT: A 6 x 1023 helium atoms B 1 g of hydrogen molecules C 12 g of carbon atoms D 22,4 dm3 ammonia at STP (2) 1.9 2,7 g of sodium hydroxide is added to 250 cm3 distilled water. Which of the following is the CORRECT concentration of solution in mol.dm -3? A 0,15 B 0,5 C 0,27 D 2,5 (2) [18] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 5 (PAPER 2) GRADE 10 QUESTION 2 (Start on a new page.) Use the table of substances below to answer the following questions. Br2 C CuSO4∙xH2O H3O+ H2O NH3 OH- Ni Brass S Si KMnO4 2.1 Write down a substance that is: 2.1.1 An anion (1) 2.1.2 A metalloid (1) 2.1.3 A magnetic substance (1) 2.1.4 A non-metal that is a conductor of electricity (1) 2.1.5 An alloy (1) 2.1.6 A diatomic molecule (1) 2.2 Compare the first ionisation energy of C and Si. (1) 2.3 Draw the Aufbau diagram of S. (3) 2.4 The experimental setup below is used to dry 10 g hydrated blue copper (II) sulphate crystals, CuSO4∙XH2O, to form 6,4 g anhydrous salt. 10 g crystals of copper sulphate 6,4 g anhydrous CuSO4 2.4.1 Define term anhydrous. (2) 2.4.2 Determine the number of moles, X, of water of crystallization. (4) [16] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 6 (PAPER 2) GRADE 10 QUESTION 3 (Start on a new page.) The grade 10 learners conducted an experiment to investigate the effect of the increase in temperature on ethanol over a X period of time at standard pressure. Water bath Ethanol Heat The graph below was drawn using the results obtained. Heating curve of ethanol Temperature (°C) Time(s) 3.1 Define the term melting point. (2) 3.2 Write down the value of standard pressure. (1) 3.3 Give the name of apparatus X. (1) 3.4 In what phase is ethanol at 0 °C? (1) 3.5 Explain, using the kinetic molecular theory, what is happening at section D. (3) 3.6 Will water or ethanol boil first at standard pressure? Explain the answer. (3) [11] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 7 (PAPER 2) GRADE 10 , QUESTION 4 (Start on a new page.) Strontium is best known for the brilliant reds it produces from its salts in fireworks and flares. Strontium is an element on the Periodic Table in period 5 group 2. The four isotopes of strontium have isotopic mass numbers of 84, 86, 87 and 88 and relative abundance of 0,56%, 9,86%, 7% and 82,58% respectively. 4.1 Define the term isotope. (2) 4.2 Write down the symbol of strontium. (1) 4.3 How many valence electrons does strontium have? (1) 4.4 Compare the atomic radius of strontium and magnesium. (2) 4.5 Calculate the relative atomic mass of strontium. (3) [9] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 8 (PAPER 2) GRADE 10 QUESTION 5 (Start on a new page.) An unknown organic compound has a formula of CxHyOz. The molar mass of this compound is 88 g∙mol-1. 5.1 Define the term empirical formula. (2) 5.2 A 2 g sample of this compound contains 1,09 g carbon and 0,18 g hydrogen. Calculate the: 5.2.1 Mass oxygen in this sample (1) 5.2.2 Empirical formula of this compound (6) 5.3 Determine the molecular formula of this compound. (3) [12] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES: CHEMISTRY 9 (PAPER 2) GRADE 10 QUESTION 6 (Start on a new page.) In the reaction below, 3 g of Na2CO3 were reacted with hydrochloric acid solution and an effervescence is observed. Na2CO3 + HCℓ → NaCℓ + CO2 + H2O 6.1 Copy and balance the chemical equation. (2) 6.2 Write the NAME and FORMULAE of the substance that caused the effervescence. (2) 6.3 From the chemical equation write down the FORMULAE of TWO compounds that are: 6.3.1 Covalent bonded (2) 6.3.2 Ionic bonded (2) 6.4 Draw Lewis dot diagrams for: 6.4.1 CO2 (2) 6.4.2 H2O (2) 6.5 Calculate the molar mass of Na2CO3. (2) 6.6 Calculate the number of moles of the 3 g of Na2CO3 used. (3) 6.7 Determine the number of oxygen atoms present in the 3 g of Na2CO3 used. (4) [21] P.T.O.

Downloaded from hlayiso.com QUESTION 7 (Start on a new page.) In the reaction below, magnesium ribbon reacts with excess hydrochloric acid according to the following balanced chemical equation. When the reaction has stopped, the plunger in the syringe remained in the position as shown in the diagram below. Mg(s) + 2HCℓ(aq) → MgCℓ2(s) + H2(g) Gas syringe Plunger Dilute hydrochloric acid Magnesium 7.1 Define one-mole of a substance. (2) 7.2 Write down the volume of H2 gas collected in the syringe. (2) 7.3 Write down ONE physical observation that indicates that a reaction is taking place. (1) 7.4 Calculate the number of moles of hydrogen gas formed at STP. (4) 7.5 Determine the mass of the magnesium ribbon used. (4) [13] TOTAL: 100 END

Downloaded from hlayiso.com TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Standard pressure Standaarddruk p 1,013 x 105 Pa Molar gas volume at STP Vm 22,4 dm3∙mol-1 Molêre gasvolume by STD Standard temperature T 273 K Standaardtemperatuur Charge on electron e -1,6 x 10-19 C Lading op elektron Avogadro's constant NA 6,02 x 1023 mol-1 Avogadro se konstante TABLE 2: FORMULAE/TABEL 2: FORMULES m n= N n= NA M n m V c= OR c = n= V MV Vm

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