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 into the surroundings, which is demonstrated 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 concentrations, suggesting more frequent collisions between magnesium and acid particles.
Step 4
Describe experiments to investigate what effect using smaller marble chips has on the rate of this reaction.
Answer
Experiment 1:
- Measure a specified volume of dilute hydrochloric acid and pour it into a conical flask.
- Use the same mass of marble chips for each trial, ensuring they are of different sizes (normal chips and smaller chips).
- Collect gas produced using a gas syringe over a period of time.
- Measure the volume of carbon dioxide produced at regular intervals.
Experiment 2:
- Repeat the procedure with varying sizes of marble chips but keep the total surface area constant by adjusting other factors accordingly.
- Record the time taken for the reactions to complete and compare the amounts of gas produced.
Results:
- Smaller chips will exhibit a more vigorous reaction with faster gas production due to an increased surface area for the reaction to take place.