Displacement Reactions

• A less reactive element is replaced by a more reative one
• Some reactions happens fast example Potassiam + Water
• Some reactions happen slowly example Iron + Oxygen
• When magnesium reacts with hydrogen it forms magnisam hydroxide, releasing hydrogen
• Phenolphthalein is an indicator which turns colourless in neutral solution
• Phenolphthalein turns pink in weak alkaline solutions
• Phenolphthalein turns orange in stronge Alkaline solutions
• Potassiam is most reactive element in the reactivities series
• When metal reacts with acid they displace hydrogen from the acid and form a salt solution.
• Metal + Acid = Metal Salt + Hydrogen
• The reactivity of metals decreases down group 1 as their atomic radius increases, making it harder to remove electrons from outer shell
• Group 2 are less reactive than Group 1 because they have full outer shell so no need to gain electron