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 of ethyl ethanoate is C₄H₈O₂. This formula signifies that the compound contains 4 carbon atoms, 8 hydrogen atoms, and 2 oxygen atoms.
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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Suggest why, despite this hazard, it is still safe to use ethyl ethanoate in sweets.
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Answer
Despite the potential dizziness caused by exposure to ethyl ethanoate vapour, it is considered safe for use in sweets because the amount used in food products is very low, minimizing any health risks when consumed. Additionally, the compound is volatile, meaning it evaporates quickly and reduces significant exposure risk.
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, one can use a method called filtration. First, filter the mixture to separate the solid soap from the liquid solution. The solid collected on the filter paper can then be washed with distilled water to remove any impurities or unwanted soluble substances. Finally, allow the solid to dry to obtain a pure sample.
Step 6
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct completion for hydrogenation is:
C unsaturated molecules in the liquid oil become saturated.
