Physical Sciences Grade 10 P2 September Test 2016 QP & Memo

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Physical Sciences pDown loaded fram h layisO.GQM, 216 Common Test 2 INSTRUCTIONS AND INFORMATION 1. Answer ALL the questions. You may use a non-programmable calculator. You may use appropriate mathematical instruments. Number the answers correctly according to the numbering system used in this question paper. A periodic table is attached for your use. Give brief motivations, discussions, et cetera where required. Round off your final numerical answers to a minimum of TWO decimal places. Copyright reserved Please turn over

Physical Sciences P: own loaded fram h layiso ‘QM. 2016 Common Test 3 QUESTION 1: MULTIPLE CHOICE Four possible options are provided as answers. Choose the correct option by writing only the letter next to the question number (1.1 — 1.3). 1.1 A substance that increases the electrical conductivity of water is called a/an A solvent B precipitate Cc electrolyte D non-polar liquid (2) 1.2 2 moles of oxygen gas react with hydrogen to form water. How many moles of hydrogen are required for the complete reaction? ; A 2 B 4 Cc 6 D 8 (2) 1.3. Which one of the following represents one mole? The number of: A atoms in 23 g of sodium B protons in 1g of hydrogen gas (H2) Cc molecules in 34 g ammonia gas (NH3) D atoms in 22 g of carbon dioxide (CO2) (2) [6] Copyright reserved Please turn over

Physical Sciences PD OWNIOaded fram hlayiSO.GRM,-2016 common Test * » 4 QUESTION 2 2.1 A learner wishes to test the electrical conductivity of potassium chloride (KCI). He sets up the apparatus as shown below. APPARATUS A APPARATUS B \ iJ @ i, ~ T~ Potassium Chloride Potassium Chloride Solution (aqueous) Crystal 2.1.1 Ammeter A; reads zero and ammeter Az has a reading greater than zero. Explain why A; reads zero and A; reads greater than zero, (2) A solution of silver nitrate (AgNOs) is added to apparatus B. APPARATUS B n 1 Potassium Chloride Solution 2.1.2 Describe what will be observed in the solution. (2) 2.1.3 How will the reading on ammeter Az be affected. (Choose from INCREASE, DECREASE or REMAIN THE SAME). Explain the answer. (3) 2.2 A learner is given a bottle of solution and suspects that it is a sulphate. ( \ 2.2.1 Describe a positive test to prove that the solution is a sulphate. (2) 2.2.2 Howcan the learner be sure that the precipitate formed is not a carbonate? (2) 2.3 Identify the type of reaction represented by the chemical equations given below. Choose from ACID ~ BASE REACTION, PRECIPITATION REACTION or REDOX REACTION. 2.3.1 Mg(OH)z + H2SO, —>» MgSO, + 2H20 (1) 2.3.2 S+O, —» SO» (1) [13] Copyright reserved Please turn over

Physical Sciences pDown loaded fram h layiso.com 2016 Common Test QUESTION 3 3.1 Copyright reserved You are given 25g of sodium sulphate (Na2SOu). 3.1.1. Calculate the number of moles of sodium sulphate that you have. 3.1.2 Calculate the number sodium atoms present in 25g of sodium sulphate. 3.2 Determine the mass of iron (Fe) present in 68g of iron oxide (Fe,Os). 3.3 Asubstance contains 40% carbon, 6,67% hydrogen and 53,33% oxygen by mass. ; 3.3.1 Determine the empirical formula of the given substance. 3.3.2 If the molecular mass of the substance is 60 g.mol’, determine its ) molecular (true) formula. QUESTION 4 4.1 32g of ammonium nitrate (NH4NOs) is added to sufficient water to make 250 cm’ of solution. 4.1.1 Define concentration. 4.1.2 Calculate the cancentration of the solution. ~ 4.2 Solid potassium chlorate (KCIOs) is heated to produce potassium chloride and oxygen gas according to the chemical equation given below. 2KCIO3) —> 2KCI + 302 4.2.1 Calculate the mass of potassium chlorate that must be used to produce 160g of potassium chloride at STP, 4.2.2 Calculate the volume of oxygen gas produced at STP if 200g of potassium chloride is produced. TOTAL MARKS: (3) (4) (2) [17] (2) (4) (4) [14] [50] Please turn over

Physical Sciences Downloaded frean hlayiso.cam. 2016 Common Test * ~ DATA FOR PHYSICAL SCIENCES GRADE 10 PAPER 2 (CHEMISTRY) TABLE 1: PHYSICAL CONSTANTS Standard pressure pr 1,013 x 10° Pa Molar gas volume at STP Vin 22,4 dm*-mol™ Standard temperature Te 273K Charge on electron e -1,6x 10°C Avagadro's constant Na 6,02 x 10” mol! TABLE 2: FORMULAE N _m nee "= M Na ( V i - - mM | n= >- cy OR Cc MV Vin (: Copyright reserved Please turn over

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