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A student investigated how a change in concentration affects the rate of the reaction between zinc powder and sulfuric acid - AQA - GCSE Chemistry - Question 9 - 2021 - Paper 2
Question 9
A student investigated how a change in concentration affects the rate of the reaction between zinc powder and sulfuric acid. The equation for the reaction is: Zn(s... show full transcript
Worked Solution & Example Answer:A student investigated how a change in concentration affects the rate of the reaction between zinc powder and sulfuric acid - AQA - GCSE Chemistry - Question 9 - 2021 - Paper 2
Step 1
Step 2
Step 3
How does Figure 9 show that zinc powder reacts more slowly with 0.05 mol/dm³ sulfuric acid than with 0.10 mol/dm³ sulfuric acid?
Answer
Figure 9 demonstrates that with 0.05 mol/dm³ sulfuric acid, the reaction progresses at a slower rate as indicated by a shallower slope compared to the steeper slope of the 0.10 mol/dm³ sulfuric acid line.
Step 4
Determine the rate of the reaction for 0.05 mol/dm³ sulfuric acid at 80 seconds.
Answer
To find the rate, draw a tangent to the curve for the 0.05 mol/dm³ line at 80 seconds. Calculate the change in volume of gas collected from the graph to find the y-step, and the x-step will be 30 seconds. The rate can then be calculated as:
Substituting the values gives an answer to 2 significant figures.
Step 5