An impure hydrocarbon fuel is burned in the apparatus in Figure 5 - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2020 - Paper 1
Question 6
An impure hydrocarbon fuel is burned in the apparatus in Figure 5.
When the fuel is burned:
- the funnel becomes hot
- a colourless liquid forms in tube A
- the ind... show full transcript
Worked Solution & Example Answer:An impure hydrocarbon fuel is burned in the apparatus in Figure 5 - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2020 - Paper 1
Step 1
the funnel becomes hot
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Answer
When the impure hydrocarbon fuel is burned, it produces heat energy. This heat is transferred to the funnel, causing it to become hot. Hydrocarbon fuels release energy through combustion, which increases the temperature of the apparatus.
Step 2
a colourless liquid forms in tube A
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Answer
The combustion of the hydrocarbon fuel leads to the formation of water vapor and carbon dioxide. As the gases travel through tube A, they cool and condense, resulting in the formation of a colourless liquid, which is primarily water.
Step 3
the indicator in tube B changes colour to show an acidic gas
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Answer
During combustion, carbon-containing fuels produce carbon dioxide, which can dissolve in water to create carbonic acid. This acidic solution causes the indicator in tube B to change colour, indicating the presence of an acidic gas (carbon dioxide).
