Energy and Phase Changes in Water

Energy and Phase Changes in Water

Assessment

Interactive Video

Physics, Science, Chemistry

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video introduces specific latent heat, explaining how energy is used during phase changes without temperature increase. It covers the types of latent heat: fusion and vaporization, and provides examples of calculating energy required for phase changes, such as melting lead and converting water to steam. The video concludes with a call to action for further learning.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary role of specific latent heat in phase changes?

To break molecular bonds during phase changes

To increase the temperature of a substance

To change the color of a substance

To decrease the temperature of a substance

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

During the boiling of water, why does the temperature remain constant at 100°C?

The water absorbs energy from the surroundings

The water loses energy to the surroundings

The energy is used to increase the kinetic energy of molecules

The energy is used to break molecular bonds

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the specific latent heat of fusion for water?

4,200 J/kg

1.00 x 10^5 J/kg

3.34 x 10^5 J/kg

2.27 x 10^6 J/kg

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following requires more energy: melting ice or boiling water?

Neither requires energy

Boiling water

Melting ice

Both require the same energy

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the energy required for a phase change calculated?

Q = M x V

Q = M x L

Q = C x L

Q = M x C x ΔT

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the example of melting lead, what is the specific latent heat of fusion used?

23 kJ/kg

2.27 x 10^6 J/kg

3.34 x 10^5 J/kg

4,200 J/kg

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in calculating the energy required to turn water at 80°C into steam?

Calculate the energy to raise the temperature to 100°C

Calculate the energy to cool the water

Calculate the energy to freeze the water

Calculate the energy to condense the steam

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