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 prod... 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 yellow flame when burned. This can also appear as orange or orange-yellow under certain conditions.
Step 2
Name a metal ion that would produce a green flame.
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Answer
Copper ions (Cu²⁺) are known to 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 flame colour because the colours can mix or blend, making it challenging to distinguish between multiple colours simultaneously. Additionally, certain ions may mask the flames of others.
Step 4
Which two metal ions are in the mixture?
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Answer
Based on Figure 1, the two metal ions in the mixture could be Li⁺ and Na⁺.
Step 5
Which ion is shown to be present by the cream precipitate?
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Answer
The presence of bromide ions (Br⁻) is indicated by the formation of a cream precipitate.
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. If sulfate ions are present, a white precipitate of barium sulfate will form.
The result of the test would be a white precipitate, confirming the presence of sulfate ions.
