The website has the complete lesson note for all the subjects in secondary school but this piece showcases the JSS2 Basic Science Lesson Note on Changes in Non-Living Things. You can use the website search button to filter out the subject of interest to you.
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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 undergoes 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 the water to form a salt solution.
Salt + water ____________ salt solution
3. All changes in the state of matter are physical changes. Such as:
- vapourization of liquid to gases
- Melting of solids to liquids e.g ice to water
- 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:
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