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Chemistry · May / June 2021 · Paper 61 · Question 4

0620

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The question as text

Dilute hydrochloric acid reacts with calcium carbonate to make carbon dioxide gas. The apparatus shown in the diagram can be used to follow the progress of the reaction. The carbon dioxide gas leaves the flask causing the mass shown on the balance to decrease. 260.00 cotton wool dilute hydrochloric acid balance calcium carbonate Plan an investigation, using the apparatus shown in the diagram, to find out how the temperature of the dilute hydrochloric acid affects the rate of the reaction. Your plan should include how your results will show how the temperature of the dilute hydrochloric acid affects the rate of the reaction. You are provided with dilute hydrochloric acid, calcium carbonate and common laboratory apparatus. [6]

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Any 6 from:

stated / set / same / measured volume of acid
stated / set / same / measured mass of calcium carbonate
add / combine / put together and start timing
Repeat (with acid) at higher / lower temperature

then:

graphical method:
measure / record mass at known / regular / specified times
plot graph
steepest line is fastest

OR mass loss in a set time

measure / record mass at a specified time
calculate / measure mass lost
largest mass loss is fastest or calculates rate by mass loss ÷ time

OR time to end of reaction

react until mass stops changing / reaction stops
record time
shortest time is fastest or calculates rate by mass loss ÷ time

OR time to lose a set mass

react until it reaches / loses a certain mass
record time
shortest time is fastest or calculates rate by mass loss ÷ time

OR mass of calcium carbonate left after a set time

filter after a set time
find mass of calcium carbonate left
lower mass of calcium carbonate is fastest or calculates rate by mass loss ÷ time
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