metal rusting

What two things cause Iron to Rust ?

• Water and Air

• Air and HCl

• Carbon Monoxide and Air

• Water and Carbon Dioxide

What was the chemical name given to Rust ?

• Carbon 
• Iron Oxide 

how can rusting of iron be prevented?

• Galvanising

• Sacrificial protection

• electroplating it with chromium

• painting iron

Rusting is a ______ process

• Chemical
• mechanical 
• physical 

Rusting is an example of

• oxidation
• reduction

What conditions are required for rusting? 

• dry cold conditions
• hot damp conditions
• dry hot conditions

what does tarnish means ?

• lose or cause to lose lustre, especially as a result of exposure to air or moisture

• destroy or damage (metal, stone, or other materials) slowly by chemical action

• combine chemically with oxygen.

what is meant by sacrificial protection?

• it is the protection of iron or steel against corrosion by using a more reactive metal. Pieces of zinc or magnesium alloy are attached to pump bodies and pipes. The protectedmetal becomes the cathode and does not corrode. The anode corrodes, thereby providing the desiredsacrificial protection.

• it is the coating of (iron or steel) with a protective layer of zinc.