Corrosion Questions: Chemistry Quiz!

1. Rusting is a special term, given to the corrosion of which metal?

Zinc

Copper

Nickel

Iron

Rusting is a special term given to the corrosion of iron because iron readily reacts with oxygen and water in the presence of air, leading to the formation of iron oxide, commonly known as rust. This process occurs when iron is exposed to moisture and oxygen over time, causing it to deteriorate and weaken. Zinc, copper, and nickel can also corrode, but the term "rusting" specifically refers to the corrosion of iron.

Explanation

Rusting is a special term given to the corrosion of iron because iron readily reacts with oxygen and water in the presence of air, leading to the formation of iron oxide, commonly known as rust. This process occurs when iron is exposed to moisture and oxygen over time, causing it to deteriorate and weaken. Zinc, copper, and nickel can also corrode, but the term "rusting" specifically refers to the corrosion of iron.

2. What conditions are required for rusting to take place?

Water only

Oxygen only

Water and oxygen

Water and carbon dioxide

water and oxygen (from the air) are required for rusting.

Explanation

water and oxygen (from the air) are required for rusting.

3. What effect does salt have on the rate of corrosion?

No effect

Speeds up corrosion

Slows down corrosion

Salt acts as an electrolyte and speeds up corrosion.

Explanation

Salt acts as an electrolyte and speeds up corrosion.

4. Corrosion is a chemical reaction that involves:

The inside of the object changing from an element to a compound

The surface of the object changing from an element to a compound

Nothing happens

The surface of the object changes from one element into another element.

For example, Iron metal changes from Fe --> Fe2+ ions

Explanation

For example, Iron metal changes from Fe --> Fe2+ ions

5. When objects (gates) are galvanized, what metal is used to protect the iron.

Aluminium

Copper

Nickel

Zinc

Galvanising is covering with a layer of zinc.

Explanation

Galvanising is covering with a layer of zinc.

6. Which of the following is not an example of physical protection?

Greasing

Painting

Attaching the metal to the negative terminal of a battery

Electroplating

Galvanising

The other 2 types of physical protection are tin-plating and coating with plastic. Physical protection puts a layer between the metal and water/oxygen.

Explanation

The other 2 types of physical protection are tin-plating and coating with plastic. Physical protection puts a layer between the metal and water/oxygen.

7. Which of the following metals would protect iron by electrons flowing to the iron?

Magnesium

Silver

Tin

Copper

Magnesium is higher than iron in the electrochemical series. It will protect the iron by sacrificing itself to protect the iron. electrons will flow from Mg --> Fe

Explanation

Magnesium is higher than iron in the electrochemical series. It will protect the iron by sacrificing itself to protect the iron. electrons will flow from Mg --> Fe

8. Corrosion is an example of?

Corrosion is an example of oxidation because it involves the reaction of a metal with oxygen in the presence of water or moisture. During corrosion, the metal atoms lose electrons and are oxidized, while oxygen gains electrons and is reduced. This process leads to the formation of metal oxides or hydroxides, causing the metal to deteriorate and weaken over time. Therefore, corrosion can be considered as a specific type of oxidation reaction that occurs specifically with metals.

Explanation

Corrosion is an example of oxidation because it involves the reaction of a metal with oxygen in the presence of water or moisture. During corrosion, the metal atoms lose electrons and are oxidized, while oxygen gains electrons and is reduced. This process leads to the formation of metal oxides or hydroxides, causing the metal to deteriorate and weaken over time. Therefore, corrosion can be considered as a specific type of oxidation reaction that occurs specifically with metals.

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9. Ferroxyl indicator changes color in the presence of Fe²⁺ ions.

Stays yellow

Yellow --> Pink

Yellow --> Blue

Pink --> Yellow

Ferroxyl indicator turns blue in the presence of Fe2+ ions.

Explanation

Ferroxyl indicator turns blue in the presence of Fe2+ ions.

10. What type of protection is galvanizing?

Physical protection

Sacrificial protection

Physical and sacrificial protection

None of the above.

Covering with a layer of zinc excludes water/oxygen - physical protection, Zinc is higher that iron in the Electrochemical series, so it will corrode to protect the iron (Sacrificial protection)

Explanation

Covering with a layer of zinc excludes water/oxygen - physical protection, Zinc is higher that iron in the Electrochemical series, so it will corrode to protect the iron (Sacrificial protection)