which statement about van der waals forces is true?\nwhen the forces are weaker, a substance will have…
which statement about van der waals forces is true?\nwhen the forces are weaker, a substance will have higher volatility.\nwhen the forces are stronger, a substance will have lower viscosity.\nwhen the forces are weaker, the boiling point of a substance will be higher.\nwhen the forces are stronger, the melting point of a substance will be lower.
Answer
Brief Explanations:
- Van der Waals forces are intermolecular forces.
- Volatility: Volatility is the tendency of a substance to vaporize. Weaker van der Waals forces mean less energy is required to separate the molecules and convert the liquid to a gas. So, weaker forces lead to higher volatility.
- Viscosity: Viscosity is a measure of a fluid's resistance to flow. Stronger van der Waals forces mean molecules are more strongly attracted to each other, so the substance will flow less easily (higher viscosity).
- Boiling point: Boiling point is the temperature at which a liquid turns to a gas. Weaker van der Waals forces mean less energy is needed to overcome the intermolecular forces and convert the liquid to a gas. So, weaker forces lead to a lower boiling point.
- Melting point: Melting point is the temperature at which a solid turns to a liquid. Stronger van der Waals forces mean more energy is needed to overcome the intermolecular forces and convert the solid to a liquid. So, stronger forces lead to a higher melting point.
Answer:
When the forces are weaker, a substance will have higher volatility.