2 (a) (i) Draw a circle around the functional group in the structure of the alcohol - AQA - GCSE Chemistry - Question 2 - 2014 - Paper 3
Question 2
2 (a) (i) Draw a circle around the functional group in the structure of the alcohol.
2 (a) (ii) What is the chemical name of this alcohol?
2 (b) Alcohols are u... show full transcript
Worked Solution & Example Answer:2 (a) (i) Draw a circle around the functional group in the structure of the alcohol - AQA - GCSE Chemistry - Question 2 - 2014 - Paper 3
Step 1
Draw a circle around the functional group in the structure of the alcohol.
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Answer
The functional group in the structure of the alcohol is the -OH (hydroxyl) group. A circle should be drawn around this group.
Step 2
What is the chemical name of this alcohol?
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Answer
The chemical name of this alcohol is ethanol.
Step 3
Suggest two ways that this apparatus could be improved to obtain accurate results.
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Answer
Use a lid to prevent heat loss during the experiment.
Insulate the beaker to minimize heat exchange with the surroundings.
Step 4
Describe how the student should do this experiment.
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Answer
To find the energy released per gram of alcohol burned, the student should follow these steps:
Measure a specific volume of water (e.g., 100 ml) and pour it into the glass beaker.
Record the initial temperature of the water using a thermometer.
Add a known mass of ethanol into the alcohol burner and record this mass.
Position the alcohol burner beneath the beaker containing water.
Light the alcohol burner and allow it to heat the water.
Stir the water gently to ensure even heating.
Monitor the temperature of the water, noting the highest temperature reached (final temperature).
After the experiment, measure the final mass of the alcohol to determine how much was burned.
Calculate the change in mass of alcohol – this will be used to determine the energy released per gram.
