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States Of Matter SP7
Transcript of States Of Matter SP7
Water to steam- evaporation
Steam back to water- condensation
Water to ice- freezing
Ice to steam- sublimation
Steam to ice- deposition
States Of Matter
Everything around us is made up of matter that can exist in three states- solid, liquid and gas. Each state change is associated with an increase or decrease in temperature. So if heat energy is applied to ice, it melts to form water. If more heat energy is applied and that water reaches boiling point, it vaporises, evaporating, creating steam. This process can work either way. When the heat is given up by the steam, it turns back into water, and so on.
When heat is applied to a liquid, it's temperature will rise as the heat is added without a change of state. The resulting increase in heat is known as sensible heat. This process can be reversed. When the heat is removed from the liquid and the temperature drops, the heat that is removed is also called sensible heat. In other words, sensible heat is any heat that causes a change in temperature without a change in state.
Changes of state, as we have seen, are the result in a change of energy. Solids can become liquids, liquids can become gases and each change of state is reversible. The heat that causes any change of state is called latent heat. Latent heat however, does not affect the substances temperature. For example water boils at 100 degrees. The heat required to raise the temperature to 100 degrees is sensible heat. The heat required to keep it at boiling point is latent heat.
1. What change of state is taking place when water changes to steam?
2. What change of state is taking place when ice turns to water?
3. What change of state is taking place when steam turns to water?
4. Explain in your own words sensible heat.
5. Explain in your own words latent heat.