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 to the oil one drop at a time. The scientist counts the number of drops until the bromine water no longer decolorises, indicating that the unsaturated fats in the oil have reacted. The process continues until the bromine solution remains orange.
Step 2
Choose one result from Table 2 that should be tested again.
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Answer
Result: Company A Test 2
Step 3
Why did you choose this result?
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I chose Company A, Test 2 because it produced an anomalous result compared to the other tests. The drops of bromine water that reacted (17) do not fit the pattern seen in Tests 1 and 3, which had higher values.
Step 4
Suggest one other variable that should be controlled in these tests.
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One other variable that should be controlled is the temperature at which the tests are conducted. This ensures that variations in temperature do not influence the reaction rate.
Step 5
Compare the results for Vegio’s cooking oil with the results of the other companies, A, B, C and D.
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When comparing the results:
A's oil has more unsaturated fat than Vegio's, as it reacted with more bromine drops in multiple tests.
B's oil also has more unsaturated fat than Vegio's based on drop counts from different tests.
C's oil has the least unsaturated fat compared to Vegio's; it consistently required fewer drops of bromine water.
Thus, Vegio ranks third in terms of unsaturated fat content.
