1. The three (3) states of matter are solids, liquids and gases.
2. Matter can change from one state to another when it gain heat or loses heat.
3. Heat is the energy that determines the movement of particles in matter. If the temperature of matter increases, the particles will get higher kinetic energy to move faster.
2. Matter can change from one state to another when it gain heat or loses heat.
3. Heat is the energy that determines the movement of particles in matter. If the temperature of matter increases, the particles will get higher kinetic energy to move faster.
4. The changes in the state of matter which take place when substance gain heat are:
a) Melting (ice → water)
b) Boiling (water → steam) / Evaporation (water → water vapour)
c) Sublimation (mothballs → vapour, dry ice [solid carbon dioxide] → carbon dioxide gas)
5. The change in the state of matter which take place when substance loses heat are:
a) Condensation (water vapour → dew)
b) Freezing (water → ice)
c) Sublimation (iodine gas → iodine crystals)
6. Differences between boiling and evaporation:
Boiling
• Gas bubbles are produced
• Happens at boiling point of liquids
• Happens throughout the liquid
• A fast process
Evaporation
• Gas bubbles are not produced
• Happens at all temperatures
• Happens at surface of liquid
• A slow process
• Happens at all temperatures
• Happens at surface of liquid
• A slow process
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