Heat and Phase Changes of Water

Heat and Phase Changes of Water

Assessment

Interactive Video

Physics, Chemistry, Science

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video explains the process of adding heat to water at its boiling point, leading to vaporization without a temperature increase. It introduces the concept of latent heat of vaporization, which is the energy required to convert liquid to gas. Example calculations demonstrate how to determine the heat needed for vaporizing different masses of water. Once fully vaporized, additional heat increases the temperature of the water vapor.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to water when it reaches its boiling point and more heat is added?

The temperature increases.

The water starts to freeze.

The water begins to vaporize.

The water remains in liquid form.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What phase change occurs when water reaches its boiling point and heat is added?

Solid to liquid

Solid to gas

Liquid to gas

Gas to liquid

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does the temperature of water remain constant at the boiling point even when heat is added?

The heat is used to cool the water.

The heat is used to increase the pressure.

The heat is used to vaporize the liquid.

The heat is lost to the surroundings.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the latent heat of vaporization?

The heat required to vaporize a liquid into gas.

The heat required to increase the temperature of a liquid.

The heat required to freeze a liquid.

The heat required to melt a solid.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How much heat is required to fully vaporize 5 grams of water if the latent heat of vaporization is 1000 J/g?

1000 joules

3000 joules

5000 joules

2000 joules

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If 1 gram of water requires 1000 joules to vaporize, how much heat is needed for 3 grams?

1000 joules

4000 joules

2000 joules

3000 joules

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the relationship between the mass of water and the heat required to vaporize it?

The heat required decreases with mass.

The heat required is the same for all masses.

The heat required increases with mass.

The heat required is independent of mass.

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