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This is about metals - AQA - GCSE Chemistry - Question 6 - 2021 - Paper 1
Question 6
This is about metals. Table 3 shows information about four substances. Table 3 Substance Melting point in °C Boiling point in °C Does it conduct electric... show full transcript
Worked Solution & Example Answer:This 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, in an alloy, the atoms are of different sizes. This means that the layers of atoms in an alloy are distorted. As a result, the layers slide over each other less easily compared to a pure metal, which contributes to the overall hardness.
Step 3
Describe a method to compare the reactivity of metal Q with that of zinc.
Answer
To compare the reactivity, the student should measure the temperature change when each metal is added to the silver nitrate solution. The procedure would involve:
- Ensuring the initial temperature of the silver nitrate solution is the same for both metals.
- Adding a measured mass of zinc powder to the solution and recording the temperature before and after the addition.
- Repeating the process with metal Q while maintaining the same concentration and volume of the silver nitrate solution.
- Comparing the temperature changes: the greater the temperature change, the more reactive the metal.