Quiz on Melting, Boiling, and Changes of State

What is the melting point of pure water?

• 0 °C

• 50 °C

• 25 °C

• 100 °C

At what temperature does pure water boil?

• 150 °C

• 100 °C

• 0 °C

• 50 °C

What happens to the temperature of a substance during a change of state?

• It remains constant

• It fluctuates

• It decreases

• It increases

What is the process called when liquid water becomes water vapor?

• Evaporation

• Condensation

• Melting

• Solidification

What occurs during boiling that does not happen during melting?

• Energy is not transferred

• Intermolecular forces are completely overcome

• Temperature increases

• Particles flow freely

What is the effect of increased temperature on the rate of evaporation?

• Stops evaporation

• Has no effect

• Increases the rate

• Decreases the rate

What is the main difference between evaporation and boiling?

• Neither involves temperature change

• Boiling occurs at any temperature, evaporation occurs at boiling point

• Evaporation occurs at any temperature, boiling occurs at boiling point

• Both occur at the same temperature

What happens to the average energy of a liquid during evaporation?

• It fluctuates

• It increases

• It remains constant

• It decreases

What is solidification?

• Solid turning into liquid

• Gas turning into liquid

• Liquid turning into solid

• Liquid turning into gas

What is the effect of air movement on evaporation?

• Has no effect

• Decreases the rate

• Stops evaporation

• Increases the rate