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This question is about metals and the reactivity series - AQA - GCSE Chemistry - Question 2 - 2020 - Paper 1
Question 2
This question is about metals and the reactivity series. Which two statements are properties of most transition metals? Tick (✓) two boxes. - They are soft metals.... show full transcript
Worked Solution & Example Answer:This question is about metals and the reactivity series - AQA - GCSE Chemistry - Question 2 - 2020 - Paper 1
Step 1
Which two statements are properties of most transition metals?
Answer
Most transition metals have the following properties:
- They form ions with different charges, which allows them to take part in various chemical reactions.
- They have high melting points, making them useful in high-temperature applications.
Step 2
Explain how these observations show that silver is less reactive than copper.
Answer
The formation of pale grey crystals indicates that silver has precipitated out of the solution, while the blue solution indicates the presence of copper ions. This implies that copper is able to displace silver from silver nitrate, showing that copper is more reactive than silver.
Step 3
Plan an investigation to identify the three metals by comparing their reactions with dilute hydrochloric acid.
Answer
- Add equal amounts of dilute hydrochloric acid to separate test tubes for each metal (X, Y, Z).
- Measure the temperature change in each reaction, if any.
- Observe for bubbling, which would indicate gas (hydrogen) release.
- For copper, no reaction is expected, shown by no bubbles or temperature change.
- Magnesium should show a significant increase in temperature and rapid bubbling, indicating it is very reactive, while iron should show moderate bubbling.
Step 4
Calculate the relative atomic mass (Ar) of metal M.
Answer
The relative atomic mass (Ar) of metal M can be calculated using the formula:
ext{Ar} = rac{(203 imes 30) + (205 imes 70)}{100}
This calculates to:
ext{Ar} = rac{6090 + 14350}{100} = rac{20440}{100} = 204.4
Thus, the relative atomic mass of metal M is 204.4.