📖 Vocabulary 📖
Substance
● A thing or any physical material
Chemical Change
● A reaction among different kinds
of matter which creates a new
substance.
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💭
Let’s Analyze
Chemical Change
⭐ happens when a new substance or product is formed.
⭐ are usually irreversible (can’t get the original form back.)
⭐ change in color, smell, texture, and even taste.
Cooking
Lighting Fireworks
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📖 Vocabulary 📖
Natural
● happens on its own, no human action
needed
● something that comes from nature
Man - made
● happens due to action of humans
● caused or made by a person
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Burning
A common chemical change that we see in our everyday life is burning.
When a thing burns it produces heat and light. Burning is a useful
chemical change.
Examples:
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Burning
It can also be harmful. When a building burns, it can lead to loss of life
and property. Forest fires destroy plants and kill animals. When fuel
burns, it produces harmful gases that cause air pollution.
Examples:
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📖 Vocabulary 📖
Fuel
● material such as coal, gas, or
oil that is burned to produce
heat or power.
Rust
● Brown substance that forms
on iron objects due to oxygen.
Photosynthesis
● process by which plants make
food using water and carbon
dioxide.
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Chemical Change: Useful
Like burning, many other chemical changes are useful for us.
⭐ They help plants to make food by the process of
photosynthesis.
⭐ They help us digest the food we eat and produce energy
from it.
⭐ They help in making many things we use in daily life such
as paper, soap, shampoo, paint, and medicine.
⭐ They help us to cook food and bake.
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Chemical Changes
Useful
⭐ beneficial to us and
makes our lives better.
Harmful
⭐ makes us sick or cause
damages to the environment.
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