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
Give the molecular formula of this compound.
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Answer
The molecular formula for ethyl ethanoate is C₄H₈O₂.
Step 2
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 is: ethanol + ethanoic acid → ethyl ethanoate + water.
Step 3
Suggest why, despite this hazard, it is still safe to use ethyl ethanoate in sweets.
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Answer
Despite the hazard associated with ethyl ethanoate, it is used in sweets because the concentrations found in food are generally very low and regulated. The brief exposure to vapor in this context poses minimal health risks. Additionally, the compound is evaporated during the cooking process, further reducing exposure.
Step 4
What type of substance is the white solid?
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Answer
The white solid formed is D soap.
Step 5
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 to separate the solid from the liquid. After filtering, the solid can be rinsed with distilled water to remove any impurities, and then dried thoroughly.
Step 6
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is C, unsaturated molecules in the liquid oil become saturated.
