Fill in each blank with the correct word from the lesson.

1. Rusting is a chemical change in which iron reacts with both _______ to form iron oxide — rust.
2. _______ is an enormous economic problem — ships, bridges, railways, and buildings are all damaged by rust.
3. _______ is the general term for the chemical attack on metals — rusting specifically refers to iron.
4. Rusting requires both _______ and water simultaneously.
5. The chemical formula of rust is _______ two oxide trihydrate.

Choose the best option for each question.

1. What two substances are needed for iron to rust?
   a) Acid and waterb) Oxygen and carbon dioxidec) Oxygen and waterd) Nitrogen and water
2. What is galvanising?
   a) Coating iron with paintb) Coating iron with a layer of zincc) Making iron into stainless steeld) Removing oxygen from around iron
3. Why does salt water cause iron to rust faster?
   a) Salt removes the protective layerb) Salt is acidicc) Salt water conducts electricity and speeds up the chemical reactiond) Salt absorbs oxygen

Write T for True or F for False in the brackets.

1. Rusting is a chemical change in which iron reacts with both oxygen and water to form iron oxide — rust.
2. Rusting is a chemical change in which iron reacts with both Acid and water to form iron oxide — rust.
3. Coating iron with a layer of zinc is one of the key concepts in the lesson on Rusting and Corrosion.
4. Coating iron with paint is the main topic of this lesson.

1. In your own words, explain what Rusting and Corrosion means.
2. List two things you learned from this lesson on Rusting and Corrosion.