Corrosion and Erosion Quiz LO 2.3/2.4

What is atmospheric corrosion not caused by?

• A single element in the atmosphere

• A combination of substances

• Water alone

• Oxygen alone

What is the effect of corrosion on a material's strength and useful life?

• Increases both

• Reduces both

• No effect

• Only affects color

Which gases, when mixed with moisture, create weak solutions of acids?

• Oxygen and nitrogen

• Carbon dioxide and sulphur trioxide

• Hydrogen and helium

• Methane and ethane

What effect do weak solutions of acids have on metals?

• They polish metals

• They strengthen metals

• They do much damage to metals

• They have no effect on metals

What is the chemical formula for water?

• H₂O

• H₂O₂

• HO

• H₂

Which of the following is better known as carbonic acid?

• H₂SO₄

• H₂CO₃

• HCl

• HNO₃

What is the effect of corrosion on metals containing iron?

• Strengthens the metal

• Causes the metal to shine

• Gradually weakens the metal

• Makes the metal more flexible

Which of the following is NOT a result of metal exposure to the atmosphere?

• Formation of a protective coating

• Formation of a harmful coating

• Melting of the metal

• Corrosion

What is the effect of a patina on the appearance of copper?

• It makes it shiny

• It turns it green

• It makes it dull

• It turns it black

What is the term for the green color that forms on copper due to oxidation?

• Rust

• Patina

• Verdigris

• Oxide