3.1 Define the term boiling point - NSC Technical Sciences - Question 3 - 2022 - Paper 2
Question 3
3.1 Define the term boiling point.
3.2 Which ONE of the compounds above contains the weakest type of intermolecular force?
In no specific order, the above compound... show full transcript
Worked Solution & Example Answer:3.1 Define the term boiling point - NSC Technical Sciences - Question 3 - 2022 - Paper 2
Step 1
Define the term boiling point.
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
The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the atmospheric pressure. At this temperature, the liquid transitions to a gaseous state.
Step 2
Which ONE of the compounds above contains the weakest type of intermolecular force?
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 C (propan-1-ol) contains the weakest type of intermolecular force. This is because it has lower hydrogen bonding capabilities compared to propanoic acid and propanal.
Step 3
3.3.1 A
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
Propanoic acid
Step 4
3.3.2 B
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
Propyl alcohol (Propan-1-ol)
Step 5
3.3.3 C
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
Propanal
Step 6
Explain the difference in the vapour pressure of propanoic acid and propan-1-ol.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Both propanoic acid and propan-1-ol contain hydrogen bonds, but propanoic acid has two sites for hydrogen bonding, giving it stronger intermolecular forces compared to propan-1-ol, which has only one site. Consequently, propanoic acid exhibits a lower vapor pressure than propan-1-ol due to the higher energy required to overcome its stronger intermolecular forces.
Step 7
Which compound has the highest melting point? Write down only A, B or C.
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
A (Propanoic acid) has the highest melting point due to its stronger intermolecular forces.
