Photo AI
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 means that heat is released during the reaction, which is evidenced by the rise in temperature.
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 indicates that the reaction rate increases with higher acid concentration, as more acid particles are 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 volume of hydrochloric acid to be used and record the results when using large marble chips. Collect the carbon dioxide gas produced over a fixed time.
Experiment 2: Repeat the experiment using smaller marble chips with the same mass of acid. Measure the volume of carbon dioxide produced over the same time period.
Results: Compare the volume of gas produced between the two experiments to determine that smaller chips provide a larger surface area, hence increasing the reaction rate.