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A fuel undergoes combustion to heat water - VCE - SSCE Chemistry - Question 2 - 2022 - Paper 1
Question 2
A fuel undergoes combustion to heat water. Which of the following descriptions of the energy and enthalpy of combustion, ΔH, of the reaction is correct? | Energy ... show full transcript
Worked Solution & Example Answer:A fuel undergoes combustion to heat water - VCE - SSCE Chemistry - Question 2 - 2022 - Paper 1
Step 1
Which of the following descriptions of the energy and enthalpy of combustion, ΔH, of the reaction is correct?
Answer
In combustion reactions, fuels release energy as heat when they react with oxygen. This means the energy is released to the water being heated, causing an increase in the water's temperature. Therefore, the energy is released by the water and the enthalpy change (ΔH) for combustion is considered negative because it is an exothermic process, where energy is released into the surroundings.
Thus, the correct answer from the options is: B. released by the water (negative).