CHEMISTRY Y8 - Reactions & Tests

CHEMISTRY Y8 - Reactions & Tests

1. Neutralisation Reaction

   • Acid + Alkali > Salt + Water
   • H+ ions + OH- ions > H2O
   • Hydrochloric Acid + Lead Hydroxide > Lead Chloride + Water

2. Metal-Acid Reaction

   • Metal + Acid > Metal Salt + Hydrogen
   • Magnesium + Hydrochloric Acid > Magnesium Chloride + Hydrogen
   • Gas being produced - Violent fizzing
   • Temperature change - Bottom of test tube gets warmer

3. Metal Carbonate-Acid Reaction

   • Metal Carbonate + Acid > Metal Salt + Water + Carbon Dioxide
   • Zinc Carbonate + Sulfuric Acid > Zinc Sulfate + Water + Carbon Dioxide

4. Squeaky Pop Test

   • 'Squeaky pop' sound is heard when a lit splint is placed in the presence of HYDROGEN GAS

5. Limewater Test

   • Turns cloudy/milky in the presence of CARBON DIOXIDE GAS

6. Complete Combustion

   • Hydrocarbon + Oxygen > Carbon Dioxide + Water
   • Enough oxygen for the fuel to burn completely

7. Incomplete Combustion

   • Hydrocarbon + Oxygen > Carbon Monoxide + Carbon + Water
   • NOT enough oxygen for the fuel to burn completely

8. Oxidation Reaction

   • Metal + Oxygen > Metal Oxide
   • Iron + Oxygen > Iron Oxide
     • Iron (solid) will rust reacting with oxygen
   • Magnesium + Oxygen > Magnesium Oxide
     • Magnesium (very hot) emits energy in the form of a bright white light
     • Magnesium Oxide - White brittle powder

9. Displacement Reaction

   • C + A compound > A + C compound
     • C joins B as it is a more reactive metal than A (displacing A in its compound)

10. Cobalt Chloride Paper Water Test

    • Cobalt chloride paper turns blue to pink when MOISTURE is added

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