3.1 Define the term vapour pressure - NSC Technical Sciences - Question 3 - 2023 - Paper 2
Question 3
3.1 Define the term vapour pressure.
The pressure exerted by a vapour at equilibrium with its liquid in a closed system.
3.2 Which compound, A or B, has the higher... show full transcript
Worked Solution & Example Answer:3.1 Define the term vapour pressure - NSC Technical Sciences - Question 3 - 2023 - Paper 2
Step 1
Define the term vapour pressure.
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Answer
The pressure exerted by a vapour at equilibrium with its liquid in a closed system.
Step 2
Which compound, A or B, has the higher boiling point?
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Answer
Compound A has the higher boiling point.
Step 3
Explain the answer to QUESTION 3.2 by referring to the STRUCTURE, STRENGTH OF INTERMOLECULAR FORCES and ENERGY.
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Answer
Compound A has a larger surface area and a longer chain length, with fewer branches compared to compound B. This increases the strength of the London dispersion forces (intermolecular forces) in compound A relative to compound B. More energy is needed to overcome these stronger intermolecular forces in compound A than in compound B.
Step 4
What type of structural isomers are compounds A, B and C?
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Answer
Chain isomers.
Step 5
Give a reason for the answer to QUESTION 3.4.
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Answer
The organic compounds have the same molecular formula but different types of chains.
