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Cooking oils contain unsaturated fats - AQA - GCSE Chemistry - Question 3 - 2014 - Paper 1
Question 3
Cooking oils contain unsaturated fats. Unsaturated fats are more healthy than saturated fats. Unsaturated fats change bromine water from orange to colourless. A sc... show full transcript
Worked Solution & Example Answer:Cooking oils contain unsaturated fats - AQA - GCSE Chemistry - Question 3 - 2014 - Paper 1
Step 1
Describe how the bromine water is used to obtain these results.
Answer
Bromine water is added to the oil drop by drop or in small amounts, while observing the reaction. The number of drops or the volume added is recorded until the bromine water changes from its orange color to colorless. This process indicates the degree of unsaturation in the cooking oil.
Step 2
Choose one result from Table 2 that should be tested again.
Answer
Result: Company A Test 1
I chose this result because it shows a higher number of bromine water drops reacting compared to Vegio’s result, indicating it may have significantly more unsaturated fat. Testing it again would help confirm this finding.
Step 3
Step 4
Compare the results for Vegio’s cooking oil with the results of the other companies, A, B, C and D. Give three conclusions that can be made from the results.
Answer
- Company A has the highest unsaturated fat content since it required the most drops of bromine water to react.
- Company C has the least unsaturated fat, as indicated by the lowest number of drops reacting.
- Overall, Vegio's oil is in the middle range of unsaturated fat content compared to the other oils tested.