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WEEK SIX
Topic: Changes in non-living things
CONTENTS:
- Types of changes in non-living things (Physical and chemical changes
- Characteristics of physical and chemical changes.
Types of changes in nonliving things
Non-living matter undergo changes i.e they can be made to change from one state to another. They can be made to form new substances.
- Physical changes
- Chemical changes
Physical changes: These are changes in which no new substances are formed. A physical change is a temporary change, it is reversible. The composition of the new substance does not change when undergoing a physical change. Examples are:
- Melting of candle wax.
- Dissolution of salt in water to form a salt solution.
Salt + water → salt solution
3 All changes in state of matter are physical changes. Such as,
- vapourization of liquid to gases
- Melting of solids to liquids e.g ice to water
iii. Liquefaction of gases to liquids e.g cooking gas is liquefied under pressure.
- Sublimation of solids to vapours
- All processes of separation of mixture are physical changes e.g distillation
- Magnetization and demagnetization of iron.
Chemical changes:
These are changes in which new substances are formed. it is not easily reversible. The composition of a substance changes during the process of chemical change. Examples of chemical changes are:
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