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.
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Answer
Bromine water is added dropwise to the oil sample using a dropper, until the bromine water no longer decolorizes. The number of drops required is recorded, which indicates the amount of unsaturated fat in the oil, as unsaturated fats cause the bromine water to change from orange to colorless.
Step 2
Choose one result from Table 2 that should be tested again.
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Answer
Result: Company A Test: Test 3
I chose this result because it had a significantly higher value of 27 drops compared to others, indicating an anomalous result that does not fit the trend observed in other tests.
Step 3
Suggest one other variable that should be controlled in these tests.
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One other variable that should be controlled is the concentration of bromine water used for each test to ensure consistency in measurements.
Step 4
Compare the results for Vegio’s cooking oil with the results of the other companies, A, B, C and D.
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Answer
Company A has more unsaturated fat than Vegio as it reacted with more drops of bromine water in all tests.
Company B has a similar amount of unsaturated fat as Vegio since their results are close.
Company C and D have less unsaturated fat compared to Vegio, as they reacted with far fewer drops of bromine water, indicating lower unsaturation levels.
