Define the term boiling point - NSC Technical Sciences - Question 3 - 2022 - Paper 2
Question 3
Define the term boiling point.
Which ONE of the compounds above contains the weakest type of intermolecular force?
In no specific order, the above compounds are id... show full transcript
Worked Solution & Example Answer:Define the term boiling point - NSC Technical Sciences - Question 3 - 2022 - Paper 2
Step 1
Define the term boiling point.
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Answer
The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the atmospheric pressure.
Step 2
Which ONE of the compounds above contains the weakest type of intermolecular force?
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Answer
The compound that contains the weakest type of intermolecular force is Compound C, which is propan-1-ol.
Step 3
Write down the NAMES of the compounds above represented by the following letters:
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Answer
A: Propanoic acid
B: Propan-1-ol
C: Propanal
Step 4
Explain the difference in the vapour pressure of propanoic acid and propan-1-ol.
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Answer
Both propanoic acid and propan-1-ol contain hydrogen bonds, but propanoic acid has two sites for hydrogen bonding, making its intermolecular forces stronger compared to propan-1-ol, which has only one site for bonding. This means that more energy is required to overcome the stronger hydrogen bonds in propanoic acid, resulting in a lower vapor pressure compared to propan-1-ol.
Step 5
Which compound has the highest melting point? Write down only A, B or C.
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Answer
The compound with the highest melting point is A, propanoic acid.
