Question

________ melting and boiling points of molecular substances show that the forces between the molecules are weak.

a) High
b) Low
c) Variable
d) Constant

Answer 1

The correct answer is b) Low, indicating that molecular substances with low melting and boiling points have weak intermolecular forces.

Step-by-step explanation:

The low melting and boiling points of molecular substances show that the forces between the molecules are weak. Therefore, the correct answer is b) Low. Molecular substances with low melting and boiling points have relatively weak intermolecular forces such as van der Waals forces or hydrogen bonds. These intermolecular forces are easier to overcome compared to the ionic or covalent bonds found in other types of compounds, which results in lower temperatures required for melting and boiling. For example, water, which is a molecular compound, melts at 0 °C and boils at 100 °C, much lower than ionic compounds like sodium chloride, which melts at 801 °C.