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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
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.
Answer
To test if the gas produced is hydrogen, you can perform the following steps:
- Collect the Gas: Use a test tube to collect the gas that is produced during the reaction between the metal and the acid.
- Apply a Lighted Splint: Take a lighted splint and bring it close to the mouth of the test tube containing the gas.
- Observe the Reaction: If hydrogen is present, the gas will ignite with a characteristic 'pop' sound. This indicates that the gas is hydrogen.
Step 2
Explain how the structure of a nickel atom, Ni, changes when it forms a nickel ion, Ni²⁺.
Answer
When a nickel atom (Ni) forms a nickel ion (Ni²⁺), it undergoes a process of ionization. The changes include:
- Loss of Electrons: The nickel atom loses two electrons from its outer shell during this process.
- Change in Charge: As it loses these electrons, the overall charge of the atom changes from neutral to +2, resulting in a nickel ion known as Ni²⁺. This loss of electrons is crucial as it determines the reactivity and chemical behavior of the nickel ion compared to the neutral nickel atom.