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2 (a) The structure of an alcohol is shown in Figure 2 - AQA - GCSE Chemistry - Question 2 - 2014 - Paper 3
Question 2
2 (a) The structure of an alcohol is shown in Figure 2. H H | | H—C—C—OH | | H H Figure 2 2 (a) (i) Draw a circle around the functional gro... show full transcript
Worked Solution & Example Answer:2 (a) The structure of an alcohol is shown in Figure 2 - AQA - GCSE Chemistry - Question 2 - 2014 - Paper 3
Step 1
Step 2
Step 3
2 (b) (i) Suggest two ways that this apparatus could be improved to obtain accurate results.
Answer
- Adding a lid or using a metal calorimeter to minimize heat loss during the experiment.
- Providing insulation around the sides of the beaker to prevent temperature fluctuations from the environment.
Step 4
2 (b) (ii) Describe how the student should do this experiment.
Answer
The student should follow these steps to perform the experiment:
- Measure a known volume of water in the glass beaker, ensuring the initial temperature of the water is noted.
- Use the thermometer to measure the starting temperature of the water accurately.
- Place the alcohol burner beneath the beaker and add a known mass of alcohol to the burner.
- Light the alcohol burner and allow the alcohol to burn for a secure and predetermined amount of time.
- Stir the water gently to ensure even heat distribution during the experiment.
- Measure the final temperature of the water once the combustion is complete.
- Record the mass of the alcohol burned by weighing the burner before and after the experiment.
- Finally, calculate the change in mass of the alcohol and the increase in water temperature.