Year 5 Science - Rusing

Which of the following is a rusty object?

• I don't know.

• 
• 

What are the factors that cause rusting

• water and air

• water only

• air only

Now you have a glass rod, a wooden stick and a nail. You put them in the test tube separately with water. This experiment is to identify object that rust. So, which object will rust after few days?

• Glass rod

• Wooden stick

• Nail

What are the characteristics of rusty objects?

• Brittle, reddish brown and rough surface

• Reddish brown and rough surface

• Brittle

If a hinge is rusted, will it make sound when u open the door?

• No!

• I think so ~

• Yes!

This is a bicycle chain. It is exposed to air and water. What can you do to prevent rusting?

• Keep in a room

• Apply oil or grease

• Immerse in water

Which of the following is a way to prevent objects from rusting?

• Immerse in water

• Plating with a layer of rustproof metal such as tin or aluminium

• Wrap with plastic

The hangers are not rusting. Why?

• Oil or grease is applied on the hangers.

• They are beautiful.

• They are coated with a layer of rustproof metal.

Why it is important to prevent objects from rusting?

• Food that exposed to rust are unsafe to be eaten.

• The objects will look nice and last longer.

• I can buy a new axe.

Why do the spoons we use at home not rust although they are exposed to water and air?

• The spoons are beautiful and nice to use.

• The spoons are immersed in oil or grease before using.

• The spoons are made of stainless steels which do not rust.