Chemical and physical changes, rusting

Question 1 of 10

Dissolving salt in water is

Question 2 of 10

Rusting of iron needs

Question 3 of 10

Rusting needs water and ___.

Question 4 of 10

When a fuel burns in plenty of air, it produces mainly

Question 5 of 10

The poisonous gas from burning charcoal in a closed room is carbon ___.

Question 6 of 10

A change that forms a new substance is a ___ change.

Question 7 of 10

Iron rusts faster near the sea.

Question 8 of 10

Oiling bicycle chains helps prevent rusting.

Question 9 of 10

Coating iron with zinc to prevent rusting is called

Question 10 of 10

Which is a sign of a chemical change?