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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. 2 (a) (i) Draw a circle around the functional group in the structure of the alcohol. 2 (a) (ii) What is the... 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
- Add a lid to the beaker to reduce heat loss due to evaporation.
- Insulate the beaker by wrapping it with a material that will minimize heat loss, ensuring that the majority of heat is retained within the water.
Step 4
2 (b) (ii) Describe how the student should do this experiment.
Answer
Experimental Method to Measure Energy Released by Alcohol
Equipment Setup
The student should set up the apparatus as shown in Figure 3, ensuring all components are correctly assembled.
Step-by-Step Procedure
- Measure the initial mass of the alcohol (ethanol) in the burner using a precise balance.
- Fill a beaker with a known volume of water and measure its initial temperature with a thermometer.
- Position the alcohol burner beneath the beaker filled with water.
- Light the alcohol and allow it to burn for a fixed period of time, ensuring that adequate stirring and ventilation are maintained.
- After the heating period, measure the final temperature of the water and the mass of the alcohol burner again.
- Calculate the change in temperature of the water and the mass lost from the alcohol to find the energy released per gram of alcohol burned.