Lesson 1, Topic 4
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Changes of States of Matter

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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 block to water. The temperature at which 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.

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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    What is matter?
    Matter is a substance on which objects are made
    List 3 state of matter?
    1. gas 2. liquid 3. solid
    Give one example of change of state in matter
    What is classification?
    Classification is when we classify matter in shapes, sizes, color, taste, and appearance

    1. matter is a substance that has weight and contains space and made
      1.gas 2.liquid 3. solid
      a group of something
      solid- melting- liquid- vapourization-gas