This question is about the Earth's resources - AQA - GCSE Chemistry Combined Science - Question 1 - 2020 - Paper 2
Question 1
This question is about the Earth's resources.
When most fuels burn carbon dioxide is produced.
Propane (C₃H₈) is a fuel.
1. Balance the equation for the combustion ... show full transcript
Worked Solution & Example Answer:This question is about the Earth's resources - AQA - GCSE Chemistry Combined Science - Question 1 - 2020 - Paper 2
Step 1
Balance the equation for the combustion of propane.
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Answer
The balanced equation for the complete combustion of propane is:
C3H8+5O2→3CO2+4H2O
Step 2
Describe the test for carbon dioxide.
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Answer
To test for carbon dioxide, you can bubble the gas through lime water. If carbon dioxide is present, the lime water will turn cloudy due to the formation of calcium carbonate.
Step 3
Complete the symbol equation for the reaction.
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Answer
C3H8→C3H6+H2
Step 4
Describe the test for hydrogen.
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Answer
To test for hydrogen, you can use a lit splint. When hydrogen is present, it will produce a 'pop' sound when ignited.
Step 5
Describe the test for alkenes.
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Answer
To test for alkenes, you can add bromine water to the substance. The colour change observed is from brown to colourless, indicating the presence of an alkene.
