Chemistry · May / June 2020 · Paper 61 · Question 4
0620
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The question as text
Cobalt, manganese and nickel are metals. They react with dilute hydrochloric acid to form hydrogen gas. Plan an investigation to find the order of reactivity of these three metals. You are provided with: ● samples of each metal ● dilute hydrochloric acid ● common laboratory apparatus. Your plan must make it clear how your investigation will be a fair test and how you will use your results to place the metals in order of reactivity. [6]
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add metals to HCl in a beaker / flask / test-tube
fair test – max 4
same volume HCl
some concentration HCl
same temperature acid
same mass / moles / amount metals
same surface area / form of metal
measure
start timing when solid added
stop timing when all solid gone / reaction to stop
OR
start timing when solid added
stop timing when collected set volume of gas
OR
start timing when solid added
measure volume of gas after a set time
OR
measure temperature at start
measure temperature after reaction OR highest temperature reached
conclusion
shortest time is most reactive
OR
biggest volume of gas most reactive
OR
biggest temperature change most reactive
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