| Why do some metals react with water and some metals do not? | A metal can only react with water if it can displace the hydrogen in water therefore metals less reactive than hydrogen can not react with water |
| Why is it difficult to extract reactive metals from its compound? | Since more the reactive the metal is more stable its compound are, therefore more harder to extract the metal |
| What are the general rules for decomposition? | All carbonates except sodium and potassium decomposes to the oxide and carbon dioxide
All hydroxides except sodium and potassium decomposes to oxide and water
All nitrates except sodium and potassium decomposes to oxide, nitrogen dioxide and oxygen, sodium and potassium nitrates break down to form nitrites and oxygen |
| What is thermite reaction and what is it used for? | Its a displacement reaction where powdered aluminium reduces iron oxide to give out molten iron which is used to fill gaps in rails which later hardens |
| What is sacrificial protection? | In order to prevent iron from rusting a metal which is more reactive than iron is used to make sure that metal reacts with oxygen instead of iron |
| What is galvanizing? | Iron or steal is coated by a layer zinc which protects the by making sure the iron or steal does not make contact with moisture or air. |
| Why does aluminium require no special protection? | Aluminium reacts with oxygen to form a thin coat of aluminium oxide which protects aluminium from corroding |
