Chemical changes

• Science
• Primary Education

Which is a chemical change

1. Burning wood
2. Cutting wood
3. Chopping vegetables
4. Shredding paper

How will we say that a chemical change has taken place?

1. None
2. Shape will change
3. No change will take place
4. Color will change

Which is not a sign of chemical change

1. Change in color
2. Change in smell
3. Change in mass
4. Bubbles are formed

Some common chemical changes 

1. Combustion

2. Rusting

3. Cooking

4. Digestion 

Combustion 

It is a chemical change in which any substance reacts with oxygen and give out heat.

Examples 

When something catches fires like people or things what is the first thing we should do?

Rusting 

It is a chemical change between iron, oxygen and water. 

Why does apple turn brown?

Banana turns brown as it reacts with oxygen in the air, the inside of banana changed chemically from inside. 

Which reaction is combustion?

1. When things burn due to oxygen
2. When things burn due to carbondioxide
3. When things do not burn
4. When only paper burns

What is rusting?

1. Reaction between iron and air
2. Reaction between iron , water and oxygen
3. Reaction of all metals with air
4. Reaction of metal with only water

List 8 things you know about chemical changes