Metals and non metals

• Indicator


  Chemical substance which changes colour when it reacts with an acid or an alkali
• Metal carbonates


  • Are bases
• Metal hydroxide


  Has an alkaline nature and can act as a base
• Acid + metal hydroxide


  Salt + water
• Red litmus paper

  • Colour in acid - red
  • Colour in base - blue
  • Colour in neutral medium - purple
• Blue litmus paper

  • Colour in acid - red
  • Colour in base - blue
  • Colour in neutral medium - purple
• Bromothymol blue

  • Colour in acid - yellow
  • Colour in base - blue
  • Colour in neutral medium - green
• Phenolphthalein

  • Colour in acid - colourless
  • Colour in base - pink
  • Colour in neutral medium - colourless
• Universal indicator

  • Colour in acid - red, orange, yellow
  • Colour in base - blue, purple, violet
  • Colour in neutral medium - green
• Hydrochloric acid (hydrogen chloride) + sodium hydroxide → sodium chloride + water
• Nitric acid (hydrogen nitrate) + lithium hydroxide → lithium nitrate + water
• Sulfuric acid (hydrogen sulfate) + sodium hydroxide → sodium sulfate + water
• Chemical name - bicarbonate of soda

  Chemical equation - NaHCO
• Chemical name - chalk

  Chemical equation - CaCO3
• Chemical name - marble

  Chemical equation - CaCO3