Chem 2018 paper 1 mistakes

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4 Terms

1
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explain why the second ionisation energy of calcium is lower than the second ionisation energy of potassium

For calcium electron taken from 4s subshell, for potassium it is taken from 3p. More shielding in the case of calcium, so less energy required to remove the electron

2
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s block metal with the highest first ionisation energy

beryllium

3
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oxide that could react with water to form a solution with pH2

so2

4
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Suggest how the concentration of copper(II) ions in the left-hand electrode changes

when the bulb is alight.

Give one reason why the EMF of the cell decreases to 0 V

Increases, concentration of cu2+ becomes the same