This question is about chemicals in fireworks - AQA - GCSE Chemistry - Question 1 - 2018 - Paper 2
Question 1
This question is about chemicals in fireworks.
Coloured flames are produced because of the metal ions present in fireworks.
What colour flame would sodium ions pro... show full transcript
Worked Solution & Example Answer:This question is about chemicals in fireworks - AQA - GCSE Chemistry - Question 1 - 2018 - Paper 2
Step 1
What colour flame would sodium ions produce?
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Answer
Sodium ions produce a bright yellow flame when burned.
Step 2
Name a metal ion that would produce a green flame.
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Answer
Copper(II) ions (Cu²⁺) produce a green flame.
Step 3
Why is it difficult to identify the metal ions from the colour of the flame?
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Answer
It is difficult to identify metal ions from the colour of the flame because different metal ions can produce similar flame colours. Additionally, if multiple metal ions are present, their colours can mix, making it hard to distinguish between them.
Step 4
Which two metal ions are in the mixture?
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Answer
Li⁺ and Na⁺ are the metal ions in the mixture.
Step 5
Which ion is shown to be present by the cream precipitate?
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Answer
The cream precipitate indicates the presence of bromide ions (Br⁻).
Step 6
Describe a test to show the presence of sulfate ions in the solution.
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Answer
To test for sulfate ions, add barium chloride solution to the sample. A white precipitate of barium sulfate (BaSO₄) will form if sulfate ions are present.
