The chemical of reaction

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  • 1. Chemical Reaction CLASS / SEMESTER : VII / 2 JUNIOR HIGH SCHOOL
  • 2. What is a chemical reaction?
    • A chemical reaction can be identified based on the change happening in the reaction
  • 3. Chemical reaction produce 4 types of reaction
    • They are…………..
    • Precipitation
    • Colour change
    • Temperature change
    • Gas
  • 4.
    • Precipitation
    • A bottom of pan : Carbonate compound ( heated water )
    • Calcium Carbonate (CaCO3) : lime water + CO2 (breath)
    • Industry : in the process of water purification
  • 5. 2. Color Changes
    • Apple is cut or peeled : brown
    • Iron : black
    • Silver : black
    • Copper : green
  • 6. 3. Gas
    • Carbide + water : Acetylene ( gas )
    • Acetylene :
    • - welding process to join metals
    • - to ripen some fruits
  • 7.
    • Bake a cake: baking soda + dough + heat : dough expand
    3. Gas
  • 8.
    • A firecracker that explodes
    • carbide + water : rising temperature on the wall of the glass
    4. Temperature Change
  • 9. evaluation
      • WRITTEN TEST
      • 1. Chemical reaction that results in a change of colour happens when….
          • iron becomes red after it is painted
          • apple becomes brown when it is peeled
          • orange is squeezed to get the juice with yellow colour
          • the colour of a rainbow in the sky
  • 10. ESSAY
    • After being washed several times, bright colour on clothes will fade out. Do physical or chemical change or both ?
  • 11.
    • Procedural checklist test :
    • Identify the following reaction. Fill in the blanks with : precipitation, gas production, change of colour and change of temperature.
    • ………………………… ..1. A ripe banana turns yellow
    • ………………………… ..2. A cake dough will grow if heated
    • ………………………… ..3. Lime water will be discolour if added with CO2
    • ………………………… ..4. Car engine will be hot after the gasoline is burned
    • ………………………… .5. A peeled apple will turn down
    • ………………………… ..6. A glass of milk crumple if add with vinegar