Chemical Reactions and Corrosion Quiz

What is rust?

• A) A type of plant

• B) A metal alloy

• C) Corrosion of iron

• D) A cleaning agent

What combination causes rust?

• A) Water and salt

• B) Oxygen and iron

• C) Moisture, oxygen, and iron

• D) Heat and iron

What is added to central heating systems to prevent corrosion?

• A) Salt

• B) Acid

• C) Inhibitors

• D) Lubricants

What is erosion in plumbing systems?

• A) Formation of rust on the surface of pipes

• B) Wearing away of tubes and fittings due to fast-flowing liquids

• C) Expansion of water when heated

• D) Deposition of minerals inside pipes

What can cause erosion in plumbing systems apart from fast-flowing liquids?

• A) High temperature

• B) Low temperature

• C) High pressure

• D) Low pressure

What is the cause of burrs left on pipework?

• Corrosion due to oxygen

• Burrs left on pipework

• Low pH water

• High pressure

What is galvanic corrosion?

• Corrosion due to acidic water

• Corrosion due to oxygen

• Corrosion caused by dissimilar metals in contact through water

• Corrosion caused by high pressure

What effect can filling a plumbing system with water have?

• Decrease in system efficiency

• Creation of a weak battery due to different metals

• Increase in temperature

• Reduction in corrosion

Which metal is particularly affected by acid corrosion?

• Iron

• Brass

• Copper

• Zinc

What is the consequence of acid corrosion on copper components?

• Increased strength

• Formation of rust

• Small leaks over time

• Reduced conductivity