YR 5 SCIENCE UNIT 7 RUSTING

A layer of reddish brown on surface of a metal is called...

• red paint

• red dirt

• rust

• brown rust

Choose an object that can rust.

• Iron spoon

• Straw

• String

• Aluminium pot

Which of the following groups consist of rusty objects?

• Nail, key, board and marble

• Nail, marble. needle and screw

• Nail, key, needle and screw

• Marble. rubber band and clothes

Objects that rust made of

• aluminium

• gold

• metal

• plastic

What are the factors that causes rusting

• presence of water and oil

• presence of water and carbon dioxide

• presence of boiled water and oxygen

• presence of water and oxygen

Rusting happens more faster when the humidity is high.

• True

• False

Which of the following can rust?

• 
• 
• 
• 

Choose the correct characteristics of rusty objects.

• Strong

• Stiff

• Rough surface

• Brittle

• Looks new

The above object can rust.

• TRUE

• FALSE

Why wooden bench do not rust?

• because it is made of plastic.

• because it is made of wood.

• because it is made of iron.