Quantitative Chemistry
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1 Quantitative Chemistry Question Paper Level Subject Exam Board Unit Topic Difficulty Level Booklet GCSE Chemistry AQA C2 Quantitative Chemistry Bronze Level Question Paper Time Allowed: 57 minutes Score: /57 Percentage: /100 Page 1
2 Page 2
3 Q1.Copper is a transition metal. (a) Where is copper in the periodic table? Tick ( ) one box. in the central block in Group 1 in the noble gas group What is a property of copper? Tick ( ) one box. breaks easily conducts electricity does not conduct heat (b) Copper ores are quarried by digging large holes in the ground, as shown in Figure 1. Page 3
4 photllurg/istock/thinkstock Give two reasons why quarrying is bad for the environment (c) Some copper ores contain only 2% copper. Most of the ore is rock that is not needed. In one ore, the main compound is copper carbonate (CuCO 3). Figure 2 shows the stages used in the extraction of copper from this ore. Page 4
5 Why is Stage 2 important? The equation for the reaction in Stage 3 is: 2 CuCO 3 + C 2 Cu + 3 CO 2 From the symbol equation, a company calculated that 247 tonnes of copper carbonate are needed to produce 127 tonnes of copper and 132 tonnes of carbon dioxide are released. Calculate the mass of carbon needed to make 127 tonnes of copper. (iii) Suggest one reason why it is important for the company to calculate the mass of reactants in Stage 3. Page 5
6 (Total 8 marks) Q2.This question is about carbon and gases in the air. (a) Carbon atoms have protons, neutrons and electrons. Complete the table by writing the relative mass of a neutron and an electron. Name of particle Relative mass proton 1 neutron electron (b) What is the total number of protons and neutrons in an atom called? Tick ( ) one box. The atomic number The mass number One mole of the atom (c) An atom of carbon has six electrons. Page 6
7 Which structure, A, B or C, represents the electronic structure of the carbon atom? The carbon atom is structure (d) Carbon reacts with oxygen to produce carbon dioxide (CO 2). How many different elements are in one molecule of carbon dioxide?... What is the total number of atoms in one molecule of carbon dioxide?... (e) Sometimes carbon reacts with oxygen to produce carbon monoxide (CO). Calculate the relative formula mass (M r) of carbon monoxide. Relative atomic masses (A r): C = 12; O = 16 M r of carbon monoxide =... Calculate the percentage by mass of carbon in carbon monoxide. Page 7
8 Percentage by mass of carbon in carbon monoxide =...% (f) Carbon dioxide is one of the gases in the air. The graph shows the percentage of argon and the percentage of carbon dioxide in the air. What is the percentage of argon in the air? Percentage of argon =... % An instrumental method is used to measure the amount of carbon dioxide in the air. Give one reason for using an instrumental method. (Total 10 marks) Q3.Lead iodide is an insoluble salt. (a) What type of substance is lead iodide? Page 8
9 Tick ( ) one box. An element A mixture A compound (b) A student produced lead iodide by a precipitation reaction. Use the correct answers from the box to complete the word equation. lead bromide lead nitrate potassium bromide potassium iodide lead iodide + potassium nitrate (c) The student wanted to separate the precipitate of lead iodide from the solution by using filtration. The student used the apparatus shown below. Explain why the apparatus would not separate the lead iodide from the mixture Page 9
10 (d) The student expected to get 5 g of lead iodide but only got 3 g. The student did this calculation. 100 Use the correct answer from the box to complete the sentence. mass of one mole percentage yield relative formula mass The student calculated the.... Give one reason why the mass the student got was less than expected. (Total 7 marks) Q4.Some students investigated reactions to produce magnesium. (a) The students used electrolysis to produce magnesium from magnesium chloride, as shown in the figure below. Magnesium chloride contains magnesium ions and chloride ions. Page 10
11 Why does solid magnesium chloride not conduct electricity? One of the products of the electrolysis of molten magnesium chloride is magnesium. Name the other product. (iii) Why do magnesium ions (Mg 2+ ) move to the negative electrode? (iv) At the negative electrode, the magnesium ions (Mg 2+ ) gain electrons to become magnesium atoms. How many electrons does each magnesium ion gain?... (b) The students did the experiment four times and weighed the magnesium produced. The table below shows their results. Experiment Mass of magnesium produced in grams Page 11
12 There is an anomalous result. Suggest one possible reason for the anomalous result. Calculate the mean mass of magnesium produced, taking account of the anomalous result. Mean mass =... g (c) The formula of magnesium chloride is MgCl 2 The relative formula mass of magnesium chloride is 95. The relative atomic mass of magnesium is 24. Use the equation to calculate the percentage mass of magnesium in magnesium chloride. Percentage mass of magnesium = 100% Percentage mass of magnesium in magnesium chloride =... % Draw a ring around the relative mass of chlorine in MgCl 2 Page 12
13 (d) Magnesium is also produced from the reaction of magnesium oxide with silicon. The equation for the reaction is: 2 MgO(s) + Si(s) SiO 2(s) + 2 Mg(s) What is the meaning of this symbol? Draw a ring around the correct answer. neutralisation reaction precipitation reaction reversible reaction The forward reaction is endothermic. Draw a ring around the correct answer to complete the sentence. decreases. In an endothermic reaction the temperature of the surroundings increases. stays the same. (Total 12 marks) Q5.Printed pictures can be made using etchings. Page 13
14 Eduardo Jose Bernardino/iStock An etching can be made when a sheet of brass reacts with iron chloride solution. (a) Brass is a mixture of two metals, copper and zinc. A mixture of two metals is called.... Draw a ring around the correct answer to complete the sentence. Copper and zinc atoms are different sizes. harder This makes brass more flexible than the pure metals. softer (b) Iron chloride has the formula FeCl 3 Relative atomic masses (A r): Cl = 35.5; Fe = 56. Calculate the relative formula mass (M r) of iron chloride (FeCl 3). Page 14
15 Relative formula mass (M r) of iron chloride =... Calculate the percentage of iron in iron chloride (FeCl 3). Percentage of iron in iron chloride =...% (Total 6 marks) Q6. Calcium oxide (quicklime) is made by heating calcium carbonate (limestone). calcium carbonate calcium oxide + carbon dioxide 100 g? 44 g (a) 44 grams of carbon dioxide is produced when 100 grams of calcium carbonate is heated. Calculate the mass of calcium oxide produced when 100 grams of calcium carbonate is heated.... mass... g (b) What mass of carbon dioxide could be made from 100 tonnes of calcium carbonate? mass... tonnes Page 15
16 (Total 2 marks) Q7. Nitrates, such as ammonium nitrate, are added to soil to help plant growth. (a) When rain falls nitrates dissolve and can end up in drinking water. Nitrates in drinking water can stop respiration in babies. This only happens if there is a lot of nitrate in the drinking water. Plants use nitrates for growth. Humans need plants. Should large amounts of nitrates be added to soil? Give two reasons for your answer. Answer... Reason Reason Page 16
17 (b) The amount of nitrogen in a nitrate compound is important. How many nitrogen atoms are there in the formula of ammonium nitrate, NH 4NO Calculate the percentage of nitrogen in ammonium nitrate, NH 4NO 3. (Relative atomic masses: H = 1; N = 14; O = 16) Percentage of nitrogen in ammonium nitrate =... % (3) (Total 6 marks) Q8.Hydrated copper sulphate is a blue solid. When it is heated, white solid anhydrous copper sulphate is made. This is a reversible reaction. hydrated copper sulphate [+ heat energy] sulphate + water (blue) anhydrous copper (white) (a) To make the forward reaction work, the hydrated copper sulphate must be heated all the time. What type of reaction is this? Page 17
18 (b) Anhydrous copper sulphate can be used in a test for water. What two things will happen when water is added to anhydrous copper sulphate? (Total 3 marks) Q9. Calculate the percentage of iron in iron sulphate (FeSO 4). (Relative atomic masses: Fe = 56, O = 16, S = 32) Percentage of iron in iron sulphate =...% (Total 3 marks) Page 18
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