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Changes Around Us
134
Transcript
CHANGES AROUND US
SOME COMMON CHANGES
- Cooking of food
- Alternation of day and night
- Spoilage of food if kept for long
- Rusting of iron
- Burning of paper
Some common changes
WHAT ALL CHANGES CAN BE SEEN IN AN OBJECTS?
Changes in object
SHAPE
SHAPE
CRUSHING CAN
SQUEEZING A BALLOON
SIZE
SIZE
Increase in number of cells causes our body to grow in size.
POSITION
POSITION
COLOUR
COLOUR
Rusting of iron
Adding iodine to water
STATE
STATE
STATE OF MATTER
MELTING OF WAX
Reversible change
Reversible and Irreversible change
IRREVERSIBLE CHANGE
Physical and Chemical Change
CHEMICAL CHANGE
Chemical change occurs when there is a chemical reaction between the substances.
The original substances present are called reactants.
The new substances formed during or after the chemical reaction are called products.
Different substances are mixed
Reaction between washing soda and lemon juice
Reaction between iron and sulphur
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