AQA GCSE CHEMISTRY Higher Tier Paper 1 Higher Tier Paper 1 2020

AQA GCSE CHEMISTRY Higher Tier Paper 1 Higher Tier Paper 1 2020. 0 1 This question is about structure and bonding. box 0 1 . 1 Which two substances have intermolecular forces between particles? [2 marks] Tick () two boxes. Diamond Magnesium Poly(ethene) Sodium chloride Water 0 1 . 2 Table 1 shows the structures of three compounds. Table 1 Compound Structure Carbon dioxide Magnesium oxide Silicon dioxide Diagrams not to scale S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 3 *03* Turn over ► IB/M/Jun20/8462/1H Do not write outside the Compare the structure and bonding of the three compounds: box • carbon dioxide • magnesium oxide • silicon dioxide. [6 marks] Turn over for the next question 8 S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 4 *04* IB/M/Jun20/8462/1H Do not write outside the 0 2 This question is about metals and the reactivity series. box 0 2 . 1 Which two statements are properties of most transition metals? [2 marks] Tick () two boxes. They are soft metals. They form colourless compounds. They form ions with different charges. They have high melting points. They have low densities. 0 2 . 2 A student added copper metal to colourless silver nitrate solution. The student observed: • pale grey crystals forming • the solution turning blue. Explain how these observations show that silver is less reactive than copper. [3 marks] S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 5 *05* Turn over ► IB/M/Jun20/8462/1H Do not write outside the 0 2 box . 3 A student is given three metals, X, Y and Z to identify. The metals are magnesium, iron and copper. Plan an investigation to identify the three metals by comparing their reactions with dilute hydrochloric acid. Your plan should give valid results. [4 marks] Question 2 continues on the next page S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 6 *06* IB/M/Jun20/8462/1H Do not write outside the 0 2 box . 4 Metal M has two isotopes. Table 2 shows the mass numbers and percentage abundances of the isotopes. Table 2 Mass number Percentage abundance (%) 203 30 205 70 Calculate the relative atomic mass (Ar) of metal M. Give your answer to 1 decimal place. [2 marks] Relative atomic mass (1 decimal place) = 11 S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 7 *07* Turn over ► IB/M/Jun20/8462/1H Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 8 *08* IB/M/Jun20/8462/1H Do not write outside the 0 3 This question is about silver iodide. box Silver iodide is produced in the reaction between silver nitrate solution and sodium iodide solution. The equation for the reaction is: AgNO3(aq) + NaI(aq) → AgI(s) + NaNO3(aq) 0 3 . 1 A student investigated the law of conservation of mass. This is the method used. 1. Pour silver nitrate solution into a beaker labelled A. 2. Pour sodium iodide solution into a beaker labelled B. 3. Measure the masses of both beakers and their contents. 4. Pour the solution from beaker B into beaker A. 5. Measure the masses of both beakers and their contents again. Table 3 shows the student’s results. Table 3 Mass before mixing in g Mass after mixing in g Beaker A and contents 78.26 108.22 Beaker B and contents 78.50 48.54 Explain how the results demonstrate the law of conservation of mass. You should use data from Table 3 in your answer. [2 marks] S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 9 *09* Turn over ► IB/M/Jun20/8462/1H Do not write outside the 0 3 box . 2 Suggest how the student could separate the insoluble silver iodide from the mixture at the end of the reaction. [1 mark] The student purified the separated silver iodide. This is the method used. 1. Rinse the silver iodide with distilled water. 2. Warm the silver iodide. 0 3 . 3 Suggest one impurity that was removed by rinsing with water. [1 mark] 0 3 . 4 Suggest why the student warmed the silver iodide. [1 mark] Question 3 continues on the next page S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 10 *10* IB/M/Jun20/8462/1H Do not write outside the 0 3 box . 5 Calculate the percentage atom economy for the production of silver iodide in this reaction. The equation for the reaction is: AgNO3(aq) + NaI(aq) → AgI(s) + NaNO3(aq) Give your answer to 3 significant figures. Relative formula masses (Mr): AgNO3 = 170 NaI = 150 AgI = 235 NaNO3 = 85 [4 marks] Percentage atom economy (3 significant figures) = % 0 3 . 6 Give one reason why reactions with a high atom economy are used in industry. [1 mark] 10 S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 11 *11* Turn over ► IB/M/Jun20/8462/1H Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 12 *12* IB/M/Jun20/8462/1H Do not write outside the 0 4 This question is about electrolysis. box A student investigated the electrolysis of copper chromate solution. Copper chromate solution is green. Copper chromate contains: • blue coloured Cu2+ ions • yellow coloured CrO4 2– ions. Figure 1 shows the apparatus used. Figure 1 The student switched the power supply on. The student observed the changes at each electrode. Table 4 shows the student’s observations. Table 4 Changes at positive electrode Changes at negative electrode Solution turned yellow Bubbles formed at the electrode Solution turned blue Solid formed on the electrode S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 13 *13* Turn over ► IB/M/Jun20/8462/1H Do not write outside the 0 4 box . 1 Explain why the colour changed at the positive electrode. [2 marks] 0 4 . 2 The gas produced at the positive electrode was oxygen. The oxygen was produced from hydroxide ions. Name the substance in the solution that provides the hydroxide ions. [1 mark] 0 4 . 3 Describe how the solid forms at the negative electrode. [3 marks] 0 4 . 4 The student repeated the investigation using potassium iodide solution instead of copper chromate solution. Name the product at each electrode when potassium iodide solution is electrolysed. [2 marks] Negative electrode Positive electrode 8 S - The Marketplace to Buy and Sell your Study Material Downloaded by: ARTNURSING | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material 14 *14* IB/M/Jun20/8462/1H Do not write outside the 0 5 This question is about the development of scientific theories. box Figure 2 shows a timeline of some important steps in the development of the model of the atom. Figure 2 0 5 . 1 The plum pudding model did not have a nucleus.