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 can be represented as C4H8O2. This indicates that there are four carbon atoms, eight hydrogen atoms, and two oxygen atoms in the compound.
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 for the reaction can be written as:
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 of dizziness from ethyl ethanoate vapor, it is considered safe to use in sweets because the concentration of ethyl ethanoate in food products is generally low. Additionally, any vapor released during the preparation or consumption is minor and dissipates quickly, reducing exposure to harmful levels.
Step 4
What type of substance is the white solid?
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Answer
The white solid formed in the reaction is soap, therefore, you would place a cross (✗) in the box next to D soap.
Step 5
Describe how a pure sample of the white solid can be obtained from this mixture.
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To obtain a pure sample of the white solid (soap), the mixture can undergo a process of filtration. By pouring the mixture through filter paper in a funnel, the white solid will be retained on the filter paper while the liquid passes through. The solid can then be washed with a small amount of cold solvent to remove impurities, and finally, it can be dried.
Step 6
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
In the context of hydrogenation of liquid oils into solid fats, you would place a cross (✗) in the box next to C unsaturated molecules in the liquid oil become saturated.
