Rate (speed) of reaction

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Ezra Arnold
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1 Rate (speed) of reaction Question Paper 1 Level IGSE Subject hemistry (62/971) Exam oard ambridge International Examinations (IE) Topic hemical reactions Sub-Topic Rate (speed) of reaction ooklet Question Paper 1 36 minutes Time llowed: Score: /3 Percentage: /1 Grade oundaries: >85% 75% 68% 6% 53% 48% % 33% <25%

2 1 Which change does not increase the speed of reaction between zinc and hydrochloric acid? adding a catalyst decreasing the temperature decreasing the particle size of the zinc using more concentrated acid 2 Which does not increase the speed of a reaction? adding a catalyst increasing the concentration of one of the reactants increasing the particle size of one of the reactants increasing the temperature 3 alcium carbonate was reacted with hydrochloric acid in a conical flask. The flask was placed on a balance and the mass of the flask and contents was recorded as the reaction proceeded. uring the reaction, carbon dioxide gas was given off. The reaction was carried out at two different temperatures. Which row is correct? change in mass decrease decrease increase increase temperature at which mass changed more quickly higher temperature lower temperature higher temperature lower temperature 2

3 4 student investigates the rate of reaction between marble chips and hydrochloric acid. The loss in mass of the reaction flask is measured. The graph shows the results of two experiments, P and Q. mass of reaction flask P Q time Which change explains the difference between P and Q? catalyst is added in P. higher temperature is used in P. igger marble chips are used in Q. Hydrochloric acid is more concentrated in Q. 5 n experiment to determine the rate of a chemical reaction could be carried out using the apparatus shown. reaction mixture Which reaction is being studied? l 2 + 2Kr 2Kl + r 2 Mg + H 2 SO 4 MgSO 4 + H 2 Nal + gno 3 NaNO 3 + gl NaOH + Hl Nal + H 2 O 3

4 6 opper(ii) carbonate reacts with dilute sulfuric acid. uo 3 (s) + H 2 SO 4 (aq) uso 4 (aq) + O 2 (g) + H 2 O(l) The speed of the reaction can be changed by varying the conditions. Which conditions would always increase the speed of this chemical reaction? Increase the concentration of the reactants. Increase the size of the pieces of copper(ii) carbonate. Increase the temperature. Increase the volume of sulfuric acid. 1, 3and 4 1 and 3 only 2 and 3 3 and 4 only 7 The apparatus shown can be used to measure the rate of some chemical reactions. gas syringe For which two reactions would the apparatus be suitable? reaction 1 reaction 2 reaction 3 reaction 4 gno 3 (aq) + Hl (aq) gl (s) + HNO 3 (aq) 2H 2 O 2 (aq) 2H 2 O(l) + O 2 (g) MgO(s) + 2Hl (aq) Mgl 2(aq) + H 2 O(l) ZnO 3 (s) + 2Hl (aq) Znl 2(aq) + O 2 (g) + H 2 O(l) 1 and 2 1 and 3 2 and 4 3 and 4 4

5 8 student investigates the rate of reaction between magnesium and excess sulfuric acid. The volume of hydrogen given off in the reaction is measured over time. The graph shows the results of two experiments, R and S. volume of hydrogen given off R S time Which change in conditions would cause the difference between R and S? catalyst is added in S. The acid is more concentrated in R than in S. The magnesium is less finely powdered in R than in S. The temperature in R is lower than in S. 9 The apparatus shown is used to measure the speed of a reaction. gas syringe reactants Which equation represents a reaction where the speed can be measured using this apparatus? Mg(s) + 2Hl (aq) Mgl 2(aq) + H 2 (g) Hl (aq) + NaOH(aq) Nal (aq) + H 2 O(l) Fe(s) + uso 4 (aq) u(s) + FeSO 4 (aq) 2Na(s) + r 2 (l) 2Nar(s) 5

6 1 The rates of some chemical reactions can be measured by using the apparatus shown. reactants g balance For which reaction is this apparatus suitable? MgO 3 + 2Hl Mgl 2 + O 2 + H 2 O Mg + Znl 2 Mgl 2 + Zn Mgl 2 + 2NaOH Mg(OH) 2 + 2Nal MgO + 2Hl Mgl 2 + H 2 O 11 student investigates the rate of reaction between zinc and an excess of sulfuric acid. The graph shows the results of two experiments, X and Y. Y volume of hydrogen X time Which change explains the difference between X and Y? catalyst is added in Y. lower temperature is used in Y. Larger pieces of zinc are used in Y. Less concentrated acid is used in Y. 6

7 12 alcium carbonate reacts with hydrochloric acid to form carbon dioxide. Which changes would slow this reaction down? decreasing the concentration of hydrochloric acid decreasing the particle size of calcium carbonate decreasing the temperature 1 and 2 only 1 and 3 only 2 and 3 only 1, 2 and 3 13 The diagram shows an experiment to compare the rate of reaction when a metal is added to hydrochloric acid. In which test-tube is the reaction fastest? concentrated hydrochloric acid dilute hydrochloric acid zinc copper zinc copper 14 The rate of a reaction depends on temperature, concentration, particle size and catalysts. Which statement is not correct? atalysts can be used to increase the rate of reaction. Higher concentration decreases the rate of reaction. Higher temperature increases the rate of reaction. Larger particle size decreases the rate of reaction. 7

8 15 Which changes decrease the rate of reaction between magnesium and air? heating the magnesium to a higher temperature using a higher proportion of oxygen in the air using magnesium ribbon instead of powdered magnesium 1, 2 and 3 1 only 2 only 3 only 16 Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid? rate rate temperature temperature rate rate temperature temperature 8

9 17 In separate experiments, a catalyst is added to a reaction mixture and the temperature of the mixture is decreased. What are the effects of these changes on the rate of the reaction? 18 n experiment is carried out to investigate the rate of reaction when calcium carbonate is reacted with hydrochloric acid. The volume of carbon dioxide gas given off is measured at different intervals of time. The diagram shows pieces of apparatus used to collect gases. 1 downward delivery 2 gas measuring syringe 3 over water in graduated tube Which apparatus is suitable to collect and measure the volume of the carbon dioxide? 1, 2 and 3 2 and 3 only 1 only 3 only 9

10 19 student was investigating the reaction between marble chips and dilute hydrochloric acid. gas syringe bung marble chips 25 cm 3 dilute hydrochloric acid Which changes would reduce the rate of reaction? 2 The effect of temperature on the rate of the reaction between marble chips and hydrochloric acid can be investigated by measuring the production of carbon dioxide. Which item of equipment is not required for the investigation? condenser gas syringe stopclock thermometer 1

11 21 The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction changes with temperature. measuring cylinder reaction mixture tank Which statement must be correct? The reaction is endothermic. The reaction is exothermic. The reaction produces a gas. The reaction produces an acid. 22 The diagram shows four experiments in which equal volumes of aqueous acid (all in an excess) are added to equal masses of metal. oth acids have the same concentration. In which experiment has the metal completely reacted in the shortest time? Hl HNO 3 Hl HNO 3 copper granules copper powder zinc granules zinc powder 11

12 23 student was asked to measure the rate of reaction between dilute hydrochloric acid and marble chips at different temperatures. Some of the apparatus used is shown. Which two other pieces of apparatus would be needed? balance and pipette balance and stopclock beaker and stopclock burette and pipette 24 Which of the following changes decreases the rate of the reaction between magnesium and dilute hydrochloric acid? diluting the acid using larger pieces of magnesium cooling the mixture 1, 2 and 3 1 and 2 only 1 and 3 only 2 and 3 only 12

13 25 Powdered marble reacts with hydrochloric acid using the apparatus shown. The gas syringe fills in 36 seconds. gas syringe gas powdered marble hydrochloric acid The experiment is repeated using marble chips in place of powdered marble. How long does it take to fill the gas syringe in this experiment? 9 seconds 18 seconds 36 seconds 72 seconds 26 simple way of making bread includes 1 2 Mixing flour with a small amount of yeast and some water to make a dough. Leaving the dough in a warm place for the yeast to act on the dough to form carbon dioxide which increases the volume of the dough. Which factors affecting a reaction rate are involved in bread making? 13

14 27 The diagram shows an experiment to measure the rate of a chemical reaction. dilute hydrochloric acid measuring cylinder metal water Which change decreases the rate of reaction? adding water to the flask heating the flask during the reaction using more concentrated acid using powdered metal 14

15 28 liquid X reacts with solid Y to form a gas. Which two diagrams show suitable methods for investigating the rate (speed) of the reaction? 1 2 cotton wool cotton wool X Y X Y balance 3 4 stopper stopper X Y X Y balance 1 and 3 1 and 4 2 and 3 2 and 4 15

16 29 n experiment, S, is carried out to measure the volume of hydrogen produced when excess dilute sulfuric acid is added to zinc. second experiment, T, is carried out using the same mass of zinc but under different conditions. The results of the two experiments are shown. total volume of hydrogen S T time Which changes in the conditions between experiments S and T give curve T? addition of a catalyst the zinc is in large pieces not powdered 3 The results of two separate reactions between excess calcium carbonate and hydrochloric acid are shown. second reaction volume of gas collected first reaction time Which statement explains the differences between the reactions? More calcium carbonate was used in the second reaction. The same volume of more concentrated acid was used in the second reaction. The second reaction was allowed to react for longer. The temperature was higher in the second reaction. 16

Which two diagrams show suitable methods for investigating the rate (speed) of the reaction?

1 liquid X reacts with solid Y to form a gas. Which two diagrams show suitable methods for investigating the rate (speed) of the reaction? 1 2 cotton wool cotton wool X Y X Y balance 3 4 stopper stopper