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This question is about metals - AQA - GCSE Chemistry - Question 6 - 2021 - Paper 1
Question 6
This question is about metals. Table 3 shows information about four substances. | Substance | Melting point in °C | Boiling point in °C | Does it conduct electrici... show full transcript
Worked Solution & Example Answer:This question is about metals - AQA - GCSE Chemistry - Question 6 - 2021 - Paper 1
Step 1
Step 2
Explain why alloys are harder than pure metals.
Answer
Alloys are harder than pure metals because the atoms in an alloy are of different sizes. This difference in size distorts the layers of atoms within the alloy, making it more difficult for these layers to slide over each other compared to the neatly stacked layers in a pure metal. As a result, alloys resist deformation better than pure metals.
Step 3
Describe a method to compare the reactivity of metal Q with that of zinc.
Answer
To compare the reactivity of metal Q with that of zinc, the student should:
- Measure the initial temperature of the silver nitrate solution.
- Add a fixed mass of zinc powder to the solution and note the temperature change after the reaction has completed, ensuring to measure the temperature before and after.
- Repeat the process with the fixed mass of metal Q powder in the same initial conditions.
- Compare the temperature changes for both metals; the metal that causes a greater temperature change is more reactive.