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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
To determine the amount of unsaturated fat in the cooking oils, bromine water is added to the oil. This is done by adding one drop at a time, using a dropper or pipette, while counting the number of drops until the bromine water no longer decolorises or remains orange. This indicates the amount of unsaturated fat present.
Step 2
Choose one result from Table 2 that should be tested again.
Answer
Result: Company A Test 2
I chose this result because the outcome appears anomalous; Company A shows a significantly higher reaction in Test 2 with 17 drops, compared to Tests 1 and 3 which were 25 and 27 respectively. This irregularity warrants re-testing to ensure accuracy.
Step 3
Step 4
Compare the results for Vegio’s cooking oil with the results of companies A, B, C and D.
Answer
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Company A has more unsaturated fat than Vegio since it required more drops of bromine water to react, indicating greater unsaturation.
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Companies B and D show similar levels to Vegio, with both having less unsaturated fat than Vegio as their bromine reaction numbers are closer to Vegio's results.
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Company C has the least amount of unsaturated fat, as it reacted with significantly fewer drops (5, 6, and 4), which positions it as the least healthy option when compared to Vegio.