The structure of a molecule of an ester, ethyl ethanoate, is shown - Edexcel - GCSE Chemistry - Question 1 - 2015 - Paper 1
Question 1
The structure of a molecule of an ester, ethyl ethanoate, is shown.
(i) Give the molecular formula of this compound.
(ii) Write the word equation for the reaction ... show full transcript
Worked Solution & Example Answer:The structure of a molecule of an ester, ethyl ethanoate, is shown - Edexcel - GCSE Chemistry - Question 1 - 2015 - Paper 1
Step 1
(i) Give the molecular formula of this compound.
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Answer
The molecular formula of ethyl ethanoate is given as C4H8O2. It consists of 4 carbon (C) atoms, 8 hydrogen (H) atoms, and 2 oxygen (O) atoms.
Step 2
(ii) Write the word equation for the reaction of ethanol with another compound to form ethyl ethanoate and another product.
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Answer
The word equation for the reaction is:
Ethanol + Ethanoic acid → Ethyl ethanoate + Water
Step 3
(iii) Suggest why, despite this hazard, it is still safe to use ethyl ethanoate in sweets.
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Answer
Despite the hazard of dizziness from ethyl ethanoate vapour, it is still safe to use in sweets because the concentration of ethyl ethanoate used in food products is very low. Additionally, it is quickly metabolized by the body, reducing any health risks associated with its consumption.
Step 4
(i) What type of substance is the white solid?
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Answer
The white solid formed from the reaction is likely to be soap. Therefore, I would put a cross (X) in the box next to D soap.
Step 5
(ii) Describe how a pure sample of the white solid can be obtained from this mixture.
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Answer
To obtain a pure sample of the white solid, the mixture can be filtered. The solid soap will remain on the filter paper, while the liquid portion can pass through. The solid can then be washed with distilled water to remove impurities and dried to obtain a pure sample.
Step 6
(c) Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer for completing the sentence is C unsaturated molecules in the liquid oil become saturated. Therefore, I would place a cross (X) in that box.
