A student used the apparatus in Figure 3 to investigate the rate of the reaction between a metal and dilute hydrochloric acid - Edexcel - GCSE Chemistry - Question 2 - 2022 - Paper 1
Question 2
A student used the apparatus in Figure 3 to investigate the rate of the reaction between a metal and dilute hydrochloric acid.
Pieces of the metal were placed in di... show full transcript
Worked Solution & Example Answer:A student used the apparatus in Figure 3 to investigate the rate of the reaction between a metal and dilute hydrochloric acid - Edexcel - GCSE Chemistry - Question 2 - 2022 - Paper 1
Step 1
2(a)(i) State the volume of hydrogen at 90 seconds.
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Answer
At 90 seconds, the volume of hydrogen is approximately 29 cm³ as read from the graph.
Step 2
2(a)(ii) Suggest how the results would change if the reaction stopped rising.
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Answer
If the graph becomes flat or plateaus, it indicates that the reaction has reached completion. This occurs when all the reactants have been consumed, and no more hydrogen gas is being produced.
Step 3
2(a)(iii) Explain why the rate of reaction decreases over time.
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Answer
The rate of reaction decreases because there are fewer reactant molecules available as the reaction proceeds, leading to a lower frequency of collisions. As the concentration of reactants decreases, the chances of successful collisions also diminish, which slows down the reaction.
