Which of the following is the formula for a molecule of butane?
Put a cross (✔) in the box next to your answer - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Question 2
Which of the following is the formula for a molecule of butane?
Put a cross (✔) in the box next to your answer.
A C₄H₁₀
B C₈H₁₈
C C₃H₈
D C₆H₁₀
(ii)... show full transcript
Worked Solution & Example Answer:Which of the following is the formula for a molecule of butane?
Put a cross (✔) in the box next to your answer - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Step 1
Which of the following is the formula for a molecule of butane?
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Answer
The correct answer is A C₄H₁₀. This indicates that butane is a four-carbon alkane with a molecular formula of C₄H₁₀.
Step 2
Draw the structure of a molecule of propene, showing all covalent bonds.
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Answer
The structure of propene (C₃H₆) can be represented as follows:
H H H
\\ | //
C=C
// \
H H
In this structure, the double bond between the two carbon atoms indicates that propene is an alkene.
Step 3
Complete the sentence by putting a cross (✔) in the box next to your answer.
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Answer
In this reaction, ethanol is C oxidised. This is because during conversion to ethanoic acid, ethanol loses hydrogen atoms.
Step 4
Describe what you would see when solid sodium carbonate is added to dilute ethanoic acid.
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Answer
When solid sodium carbonate is added to dilute ethanoic acid, effervescence or bubbling will be observed. This occurs due to the release of carbon dioxide gas (CO₂) as sodium carbonate reacts with the acid.
Step 5
Complete the balanced equation for this reaction.
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Answer
The balanced equation for the reaction between ethanoic acid and ethanol to form ethyl ethanoate is:
CH3COOH+C2H5OH→CH3COOC2H5+H2O
Here, ethyl ethanoate (the ester) and water are produced.
