Lesson 1, Topic 4
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Changes of States of Matter

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Topic Content:

  • Changes of States of Matter

All matter is interchangeable, that is it can change from one state to the other, as a result of a change in temperature.

states of matter

Melting:

When a solid changes into a liquid, it is called melting, for example, ice to water. The temperature at which a solid changes into a liquid is called “melting point”. 

Solid particles gain enough energy to overcome the attractive forces of the surrounding particles.

Condensation:

This is when gas changes into a liquid, for example, steam to water.

Boiling/Evaporation:

When a liquid changes into a gas, evaporation takes place, for example, water into steam. The temperature at which liquid changes freely into its vapour is called its “boiling point”. For the case of silver, it is 2162°C, while in the case of water, it is only 100°C. Boiling arises as a result of the liquid particles, gaining enough kinetic energy to overcome the attractive forces of the surrounding particles.

Sublimation:

This is when solid changes directly into a gas, for example, iodine crystals to iodine vapour.

Purple iodine vapour appears when solid iodine is warmed

Evaluation Questions:

1. Define matter?

2. List three (3) states of matter.

3. Give one example of a change of state of matter. 

4. What is the meaning of classifications?

5. Using diagram(s) only, illustrate the changes of state of matter.

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