NSC Physical Sciences Organic Compounds and Macromolecules: 3.1 Define the term boiling poin

Question

3.1 Define the term boiling point.  
The boiling point is the temperature at which the vapor pressure of a substance equals atmospheric/external pressure.

3.2 The boiling points of compounds A, B and C are compared.  
3.2.1 How do the boiling points vary from compound A to compound C?  
Choose from INCREASES, DECREASES or REMAINS THE SAME.
The boiling point increases from compound A to compound C.

3.2.2 Explain the answer to QUESTION 3.2.1.  
The boiling point increases due to the increase in molecular mass and chain length, which leads to more significant London dispersion forces, requiring more energy to break these intermolecular forces.

3.3 The boiling points of compounds B, C and D are compared.  
Is this a fair comparison?  
Choose from YES or NO. Give a reason for the answer.
No, it is not a fair comparison because the compounds have varying structural features affecting their boiling points.

3.5 The boiling points of compounds E and F are compared.  
3.5.1 State the independent variable for this comparison.
The independent variable is the type of compound.

3.5.2 Write down the name of the strongest Van der Waals force present in compound F.
Dipole-dipole forces.

3.6 Which compound, D or E, has a higher vapour pressure? Give a reason for the answer.
Compound D has a higher vapour pressure due to its lower boiling point, indicating that it evaporates more readily.

3.1 Define the term boiling point - NSC Physical Sciences - Question 3 - 2022 - Paper 2

Worked Solution & Example Answer:3.1 Define the term boiling point - NSC Physical Sciences - Question 3 - 2022 - Paper 2

Define the term boiling point.

How do the boiling points vary from compound A to compound C?

Explain the answer to QUESTION 3.2.1.

Is this a fair comparison?

State the independent variable for this comparison.

Write down the name of the strongest Van der Waals force present in compound F.

Which compound, D or E, has a higher vapour pressure? Give a reason for the answer.

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