Viscosity

The video explains how the molecular structure of substances affects their viscosity. Long molecules with strong intermolecular bonds result in high viscosity, while short molecules with weak bonds lead to low viscosity. Additionally, viscosity increases as temperature decreases, exemplified by lava, which flows quickly when hot and thickens as it cools.

How do long molecules with strong intermolecular bonds affect the viscosity of a substance?

• They make the substance evaporate.

• They have no effect on viscosity.

• They decrease the viscosity.

• They increase the viscosity.

What is the effect of short molecules with weak intermolecular bonds on viscosity?

• They increase the viscosity.

• They decrease the viscosity.

• They have no effect on viscosity.

• They make the substance solidify.

What happens to the viscosity of a substance as the temperature decreases?

• Viscosity decreases.

• Viscosity causes the substance to freeze.

• Viscosity remains constant.

• Viscosity increases.

Why does lava become thicker and slower as it cools?

• Because its viscosity increases.

• Because it loses mass.

• Because it gains energy.

• Because its viscosity decreases.

Which of the following statements is true about the relationship between temperature and viscosity?

• Viscosity is unaffected by temperature changes.

• Viscosity decreases as temperature decreases.

• Viscosity causes temperature to rise.

• Viscosity increases as temperature decreases.