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.
1.1 What colour flame would sodium ions ... 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, often described as orange or orange-yellow.
Step 2
Name a metal ion that would produce a green flame.
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Answer
Barium ions (Ba²⁺) or copper ions (Cu²⁺) will 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 because the flame colors can mix or blend together, making it challenging to distinguish individual colors. Additionally, only one color may be seen at a time, masking the presence of other ions.
Step 4
Which two metal ions are in the mixture?
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Answer
The two metal ions present in the mixture are Li⁺ and Na⁺.
Step 5
Which ion is shown to be present by the cream precipitate?
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Answer
The ion that is shown to be present by the cream precipitate is 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 solution containing sulfate ions. A white precipitate of barium sulfate will form, indicating the presence of sulfate ions.
