Metal corrosion and rusting

Question 1

what is corrosion

Answer 1

destruction of metals by chemical reactions with substances in the environment

Question 2

what substances can cause corrosion

Answer 2

oxygen
water
acid rain
CO2

Question 3

What is rusting

Answer 3

a specific compound (hydrated iron oxide)

Question 4

what happens during rusting

Answer 4

water gets trapped inside iron oxide (water of crystallisation)

Question 5

what is the formula for rusting

Answer 5

Fe2O3 * 9H2O

Question 6

what do you need for iron to rust

Answer 6

water and oxygen

Question 7

how do you prevent corrosion and rusting

Answer 7

isolating the metal from the environment

Question 8

how do you isolate the metal

Answer 8

painting
waxing
greasing

Question 9

what is an alternative way to stop corrosion

Answer 9

using a more reactive body guard - SACRIFICIAL PROTECTION

Question 10

what is an example of sacrificial protection

Answer 10

placing magnesium coat over iron means that magnesium reacts first and iron doesnt rust