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When zinc reacts with copper sulfate solution, zinc sulfate solution and copper are formed - Edexcel - GCSE Chemistry - Question 6 - 2014 - Paper 1
Question 6
When zinc reacts with copper sulfate solution, zinc sulfate solution and copper are formed. (i) An experiment was carried out to measure the temperature change when... show full transcript
Worked Solution & Example Answer:When zinc reacts with copper sulfate solution, zinc sulfate solution and copper are formed - Edexcel - GCSE Chemistry - Question 6 - 2014 - Paper 1
Step 1
Explain what the temperature readings show about the type of heat change that occurs during this reaction.
Answer
The temperature increased from 20 °C to 46 °C, indicating that the reaction is exothermic. This shows that heat energy is released during the reaction, resulting in an increase in the temperature of the solution.
Step 2
Step 3
Use the graph to explain how the rate of this reaction changes as the concentration of hydrochloric acid increases.
Answer
As the concentration of hydrochloric acid increases, the time taken for magnesium to react decreases. This implies that the rate of reaction increases with higher concentrations of the acid, which leads to more acid particles available to react with the magnesium.
Step 4
Describe experiments to investigate what effect using smaller marble chips has on the rate of this reaction.
Answer
Experiment 1: Measure the same volume of dilute hydrochloric acid and place it in a conical flask. Use large marble chips and note the time taken for the reaction to produce a certain amount of carbon dioxide, measuring the gas with a gas syringe.
Experiment 2: Repeat the experiment using smaller marble chips but keeping the same volume of hydrochloric acid. Again, measure the time taken for a similar volume of carbon dioxide to be produced.
Results: Compare the time taken for the reaction in both experiments. Smaller marble chips should react more vigorously and produce gas faster due to a greater surface area available for the reaction.