The chemical of reaction
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The chemical of reaction

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    The chemical of reaction The chemical of reaction Presentation Transcript

    • Chemical Reaction CLASS / SEMESTER : VII / 2 JUNIOR HIGH SCHOOL
    • What is a chemical reaction?
      • A chemical reaction can be identified based on the change happening in the reaction
    • Chemical reaction produce 4 types of reaction
      • They are…………..
      • Precipitation
      • Colour change
      • Temperature change
      • Gas
      • Precipitation
      • A bottom of pan : Carbonate compound ( heated water )
      • Calcium Carbonate (CaCO3) : lime water + CO2 (breath)
      • Industry : in the process of water purification
    • 2. Color Changes
      • Apple is cut or peeled : brown
      • Iron : black
      • Silver : black
      • Copper : green
    • 3. Gas
      • Carbide + water : Acetylene ( gas )
      • Acetylene :
      • - welding process to join metals
      • - to ripen some fruits
      • Bake a cake: baking soda + dough + heat : dough expand
      3. Gas
      • A firecracker that explodes
      • carbide + water : rising temperature on the wall of the glass
      4. Temperature Change
    • 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
    • ESSAY
      • After being washed several times, bright colour on clothes will fade out. Do physical or chemical change or both ?
      • 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