What are changes of state and why do they take place?

In this lesson, we will learn about what happens when substances are heated or cooled enough to change state. We will learn about the four main state changes and identify examples of each of them.

What are changes of state and why do they take place?

In this lesson, we will learn about what happens when substances are heated or cooled enough to change state. We will learn about the four main state changes and identify examples of each of them.

Lesson details

Key learning points

  1. Describe what happens to the arrangement of particles when a substance changes state
  2. Name each of the changes of state
  3. Give an example of each change in state

Licence

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5 Questions

Q1.
When you heat a substance the particles...
Have less energy.
Correct answer: Have more energy.
Have no energy.
Have the same amount of energy.
Q2.
When you cool a substance the particles...
Correct answer: Have less energy.
Have more energy.
Have no energy.
Have the same amount of energy.
Q3.
When a substance is cooled it...
Correct answer: Contracts
Expands
Stays the same volume.
Q4.
When a substance is heated it...
Contracts
Correct answer: Expands
Stays the same volume.
Q5.
What happens to the particles in a solid when it is cooled?
They stop vibrating.
Correct answer: They vibrate less.
They vibrate more.
They vibrate the same amount.

5 Questions

Q1.
Which change of state occurs when a solid becomes a liquid?
Boiling
Condensing
Freezing
Correct answer: Melting
Q2.
Which state changes occurs when a gas becomes a liquid?
Boiling
Correct answer: Condensing
Freezing
Melting
Q3.
When a solid is cooled the particles...
slide past each other
stop moving
Correct answer: vibrate less
vibrate more
Q4.
When a liquid boils the particles...
move closer together
Correct answer: move further apart
stop moving
vibrate in fixed positions
Q5.
When gases condense the particles...
Correct answer: move closer together
move further apart
stop moving
vibrate in fixed positions

Lesson appears in

UnitScience / States of matter

Science