3.1 Define the term vapour pressure - NSC Technical Sciences - Question 3 - 2023 - Paper 2
Question 3
3.1 Define the term vapour pressure.
3.2 Which compound, A or B, has the higher boiling point?
3.3 Explain the answer to QUESTION 3.2 by referring to the STRUCTURE... 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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Vapour pressure is defined as the pressure exerted by a vapour in equilibrium with its liquid in a closed system. It represents the tendency of a substance to evaporate.
Step 2
Which compound, A or B, has the higher boiling point?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Compound A has the higher boiling point compared to compound B.
Step 3
Explain the answer to QUESTION 3.2 by referring to the STRUCTURE, STRENGTH OF INTERMOLECULAR FORCES and ENERGY.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Compound A has a larger surface area, longer chain length, and fewer branches than compound B, leading to stronger London dispersion forces. The stronger intermolecular forces in compound A require more energy to overcome compared to those in compound B, resulting in a higher boiling point for compound A.
Step 4
What type of structural isomers are compounds A, B and C?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Compounds A, B, and C are chain isomers.
Step 5
Give a reason for the answer to QUESTION 3.4.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The organic compounds A, B, and C share the same molecular formula but differ in their structural arrangements, qualifying them as structural isomers.
