Certainly! Below are the answers to each part of Question 3.
Question 3.1.1 [2 marks]
Define the term boiling point.
The boiling point of a substance is the temperature at which its vapor pressure equals the atmospheric pressure surrounding it. At this temperature, the substance transitions from the liquid phase to the gas phase (vapor). For a pure substance, the boiling point is a characteristic property and is influenced by intermolecular forces, molecular weight, and atmospheric conditions.
Question 3.1.2 [1 mark]
Calculate the molecular mass of compound D.
The molecular formula of compound D is C8H16. To calculate the molecular mass, we use the atomic masses of carbon (C) and hydrogen (H):
- Atomic mass of Carbon (C) = 12.01 g/mol
- Atomic mass of Hydrogen (H) = 1.008 g/mol
Calculating the molecular mass:
\[ \text{Molecular Mass of } C8H16 = (8 \times 12.01) + (16 \times 1.008) \] \[ = 96.08 + 16.128 \] \[ = 112.208 \text{ g/mol} \]
Rounded off, the molecular mass of compound D is approximately 112.21 g/mol.
Question 3.1.3 [1 mark]
In what phase is compound D at 100 °C?
Since the boiling point of compound D is 121 °C, at 100 °C, compound D is in the liquid phase. It has not yet reached its boiling point, so it has not vaporized.
Question 3.1.4 [1 mark]
Name the main type of intermolecular force present in compound A.
Compound A (C2H4, ethene) is a non-polar molecule that primarily exhibits van der Waals forces (or London dispersion forces) as its main type of intermolecular force.
If you have any further questions or need assistance, feel free to ask!
2 answers