Useful materials, including foods and fuels, are produced from plants - AQA - GCSE Chemistry - Question 6 - 2015 - Paper 1
Question 6
Useful materials, including foods and fuels, are produced from plants.
(a) Some plants have seeds that contain vegetable oils.
(i) Give one reason why vegetable oi... show full transcript
Worked Solution & Example Answer:Useful materials, including foods and fuels, are produced from plants - AQA - GCSE Chemistry - Question 6 - 2015 - Paper 1
Step 1
Give one reason why vegetable oils are important foods and fuels.
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Answer
Vegetable oils provide energy.
Step 2
State the two main stages used to extract a sample of vegetable oil from seeds.
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Answer
Crushing
Pressing
Step 3
One property of a vegetable oil gives the oil an advantage over water for cooking foods. Explain how.
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Answer
Vegetable oils have a higher boiling point than water, which allows foods to be cooked faster at higher temperatures.
Step 4
Explain how the emulsifier molecules are able to produce an emulsion that is a stable mixture containing the vegetable oil and water.
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Answer
Emulsifier molecules have a 'head' that is hydrophilic, which means it is attracted to water, and a 'tail' that is hydrophobic, meaning it is attracted to oil. This allows the emulsifier to interact with both the water and the oil, forming a stable suspension. The hydrophilic head dissolves in the water while the hydrophobic tail interacts with the oil, preventing separation and creating a stable emulsion.
