Chemistry > EXAM > GCSE COMBINED SCIENCE: TRILOGY Higher Tier Chemistry Paper 1H May 2019 (All)

GCSE COMBINED SCIENCE: TRILOGY Higher Tier Chemistry Paper 1H May 2019

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Figure 1 shows what happens when calcium, copper, magnesium and zinc are added to hydrochloric acid. Figure 1 0 1 . 1 What is the order of decreasing reactivity of these four metals? [1 mark] Tic... k (9) one box. Zn Ca Cu Mg Ca Cu Mg Zn Cu Zn Ca Mg Ca Mg Zn Cu Do not write outside the box 3 *03* Turn over ► IB/M/Jun19/8464/C/1H Do not write outside the box 9 A student wants to make a fair comparison of the reactivity of the metals with hydrochloric acid. 0 1 . 2 Name two variables that must be kept constant. [2 marks] 1 2 0 1 . 3 What is the independent variable in this reaction? [1 mark] 0 1 . 4 Predict the reactivity of beryllium compared with magnesium. Give a reason for your answer. Use the periodic table. [2 marks] Reason 0 1 . 5 A solution of hydrochloric acid contains 3.2 g of hydrogen chloride in 50 cm3 Calculate the concentration of hydrogen chloride in g per dm3 [3 marks] Concentration = g per dm3 4 *04* IB/M/Jun19/8464/C/1H Do not write outside the 0 2 This question is about salts. box Ammonium nitrate solution is produced when ammonia gas reacts with nitric acid. 0 2 . 1 Give the state symbol for ammonium nitrate solution. [1 mark] 0 2 . 2 What is the formula of nitric acid? [1 mark] Tick (9) one box. HCl HNO3 H2SO4 NH4OH 0 2 . 3 Ammonia gas dissolves in water to produce ammonia solution. Ammonia solution contains hydroxide ions, OH– A student adds universal indicator to solutions of nitric acid and ammonia. What colour is observed in each solution? [2 marks] Colour in nitric acid Colour in ammonia solution 5 *05* Turn over ► IB/M/Jun19/8464/C/1H Do not write outside the box 0 2 . 4 The student gradually added nitric acid to ammonia solution. Which row, A, B, C or D, shows the change in pH as the nitric acid is added until in excess? [1 mark] Tick (9) one box. pH of ammonia solution at start pH after addition of excess nitric acid A 10 7 B 2 10 C 7 1 D 10 2 0 2 . 5 Calculate the percentage by mass of oxygen in ammonium nitrate (NH4NO3). Relative atomic masses (Ar): H = 1 N = 14 O = 16 Relative formula mass (Mr): NH4NO3 = 80 [3 marks] Percentage by mass of oxygen = % Question 2 continues on the next page 6 *06* IB/M/Jun19/8464/C/1H Do not write outside the box 14 0 2 . 6 Describe a method to investigate how the temperature changes when different masses of ammonium nitrate are dissolved in water. You do not need to write about safety precautions. [6 marks] 7 *07* Turn over ► IB/M/Jun19/8464/C/1H Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 8 *08* IB/M/Jun19/8464/C/1H Do not write outside the box 0 3 This question is about oxygen. 0 3 . 1 Hydrogen reacts with oxygen. 2 H2 (g) + O2 (g) → 2 H2O (g) Figure 2 shows the relative energies of the reactants and products at a certain temperature. Figure 2 Label the activation energy on Figure 2. [1 mark] 9 *09* Turn over ► IB/M/Jun19/8464/C/1H Do not write outside the box 0 3 . 2 Determine the overall energy change for the reaction between hydrogen and oxygen shown in Question 03.1 Use Figure 2. [Show More]

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