Physical Sciences Grade 10 P2 Gauteng June 2022 QP (Eng)

Downloaded from hlayiso.com PROVINCIAL EXAMINATION JUNE 2022 GRADE 10 PHYSICAL SCIENCES (CHEMISTRY) (PAPER 2) TIME: 1 hour MARKS: 50 8 pages + 2 data sheets and a graph sheet P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 2 (Paper 2) GRADE 10 INSTRUCTIONS AND INFORMATION 1. Write your name in the appropriate space on the ANSWER BOOK. 2. This question paper consists of SIX 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. 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, where needed. 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. Write only the letter (A – D) next to the question number (1.1 to 1.5) in the ANSWER BOOK. 1.1 Which of the following is a homogeneous mixture? A Sand and water B Muesli C Salt solution D Carbon dioxide (2) 1.2 The process whereby a substance changes from a liquid to a solid at low temperature is called … A evaporation B freezing C melting D sublimation (2) 1.3 The correct formula for lead(II) nitrate is … A Pb2(NO3)3 B Pb(NO3)2 C Pb3(NO3)2 D PbNO3 (2) 1.4 The electronegativity of sulphur is … A 32 B 16 C VI D 2,5 (2) 1.5 Two substances that can be classified as molecular substances are: A Ammonia and hydrogen chloride B Magnesium chloride and hydrogen chloride C Magnesium chloride and sodium D Graphite and iodine (2) [10] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 4 (Paper 2) GRADE 10 QUESTION 2 (Start on a new page.) 2.1 Differentiate between a thermal conductor and an electrical conductor. (2) 2.2 Study the seven substances listed below and answer the questions that follow. glass; copper; sugar water; nickel; carbonated water; air; carbon dioxide From the list above, identify: 2.2.1 A thermal conductor (1) 2.2.2 A magnetic material (1) 2.2.3 A heterogeneous mixture (1) 2.2.4 An electrical insulator (1) [6] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 5 (Paper 2) GRADE 10 QUESTION 3 (Start on a new page.) The grade 10 learners were investigating the effect of heat on ice, H 2O(s). The temperature was recorded every 5 minutes. The following results were obtained and recorded in the table below. Time (min) 0 5 10 15 20 25 30 35 40 Temperature (°C) -10 0 0 0 25 45 75 85 85 3.1 Define the term boiling point. (2) 3.2 Name the instrument used to measure the temperature of ice, H2O(s). (1) 3.3 Identify the independent variable. (1) 3.4 On the graph sheet provided, draw the graph that represents the data provided in the table above. (5) 3.5 Name the process that water undergoes at the time between 35 and 40 minutes. (1) 3.6 Explain your answer to QUESTION 3.5 by referring to energy changes. (3) [13] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 6 (Paper 2) GRADE 10 QUESTION 4 (Start on a new page.) The diagram below shows the element hydrogen which has three isotopes: protium, deuterium and tritium. Protium Deuterium Tritium 4.1 Define the term isotopes. (2) 4.2 The table below shows the three isotopes, the number of particles (incomplete) and the relative abundance of each isotope. Isotopes Number Number of Number of Mass Relative of of protons electrons neutrons number abundance hydrogen (%) Protium 1 (4.2.1) (4.2.2) 1 99,985 Deuterium 1 1 1 (4.2.3) 0,015 Tritium (4.2.4) 1 2 3 Rare (negligible) Complete the table by writing only 4.2.1 to 4.2.4 and the correct number of particles. (4) 4.3 Use the table above and calculate the relative atomic mass of hydrogen. (3) [9] P.T.O.

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 7 (Paper 2) GRADE 10 QUESTION 5 (Start on a new page.) Electrolysis is the process of using electricity to decompose water into oxygen and hydrogen gas. The experimental setup is shown in the diagram below. acidified water The equation for this experiment is: 2H2O → 2H2 + O2 5.1 Identify the bond in water. Choose from covalent bond, ionic bond or metal bond. Explain the answer. (2) 5.2 Draw the Aufbau diagram of an oxygen atom. (2) 5.3 Write the sp-notation of oxide ion. (2) 5.4 Draw the Lewis dot diagram for an oxygen molecule. (2) [8] P.T.O.

Downloaded from hlayiso.com QUESTION 6 (Start on a new page.) The following graph shows the first ionisation energy for a few elements. Ionisation Energy (kJ) 2 500 2 000 1 500 1 000 500 Atomic Number 6.1 Define the term ionisation energy. (2) 6.2 Compare the ionisation energy of elements in group 18, periods 1 and 2, with one another. (2) [4] TOTAL: 50 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 CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Standard pressure p 1,013 x 105 Pa Standaarddruk 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= M NA n m V c= OR c = n= V MV Vm

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 10 (Paper 2) GRADE 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (II) (III) (IV) (V) (VI) (VII) (VIII)

Downloaded from hlayiso.com PHYSICAL SCIENCES (CHEMISTRY) 11 (Paper 2) GRADE 10 Name: Question 3.4 (5)