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Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2018 - Paper 1

Question 1

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Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen. (i) Describe the test to show the gas is hydrogen. (ii) Nickel... show full transcript

Worked Solution & Example Answer:Salts of metals can be prepared by reacting the metal with an acid to produce the salt and hydrogen - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2018 - Paper 1

Step 1

Describe the test to show the gas is hydrogen.

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Answer

To test for hydrogen gas, a lit splint should be used. When the gas is collected and a lit splint is introduced, it will produce a characteristic ‘pop’ sound, indicating the presence of hydrogen.

Step 2

Explain how the structure of a nickel atom, Ni, changes when it forms a nickel ion, Ni²⁺.

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Answer

When a nickel atom (Ni) forms a nickel ion (Ni²⁺), it loses two electrons. This loss changes its electron configuration, as the ion now has two fewer electrons than the neutral atom, leading to a positive charge of +2. The number of protons in the nucleus remains unchanged.

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