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A student investigated the temperature change in displacement reactions between metals and copper sulfate solution - AQA - GCSE Chemistry - Question 5 - 2018 - Paper 1
Question 5
A student investigated the temperature change in displacement reactions between metals and copper sulfate solution. Table 2 shows the student's results. Table 2 M... show full transcript
Worked Solution & Example Answer:A student investigated the temperature change in displacement reactions between metals and copper sulfate solution - AQA - GCSE Chemistry - Question 5 - 2018 - Paper 1
Step 1
Plot the data from Table 2 on Figure 4 as a bar chart.
Answer
To plot the data as a bar chart:
- Label the x-axis with the metals: Copper, Iron, Magnesium, and Zinc.
- Label the y-axis with the temperature increase in °C, ensuring to have a suitable scale to show all values clearly.
- Plot the bars accurately according to the temperature increases:
- Copper: 0°C
- Iron: 13°C
- Magnesium: 43°C
- Zinc: 17°C.
Step 2
Step 3
Describe a method to find the position of an unknown metal in this reactivity series.
Answer
To find the position of an unknown metal in the reactivity series, the following method can be used:
- Add the unknown metal to a copper sulfate solution.
- Measure the temperature change after the reaction occurs.
- Based on the temperature change, compare with the previously recorded values:
- If the temperature increases significantly, the unknown metal is more reactive than copper.
- If there is little to no temperature change, the unknown metal is less reactive.
Step 4
Draw a fully labelled reaction profile for the reaction between zinc and copper sulfate solution on Figure 5.
Answer
To draw the reaction profile for the reaction between zinc and copper sulfate:
- Start with the 'Progress of reaction' on the x-axis and 'Energy' on the y-axis.
- Draw a downward slope starting from a higher energy level (reactants) to a lower energy level (products) to indicate an exothermic reaction.
- Mark the activation energy as a peak in the curve, showing the energy needed to start the reaction.
- Label the reactants and products appropriately, denoting the energy change. The energy profile should illustrate the significant drop in energy, indicating that the reaction releases heat.