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The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
The chemical of reaction
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The chemical of reaction

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Transcript

  • 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

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