Chemical Reaction   CLASS / SEMESTER : VII / 2 JUNIOR HIGH SCHOOL
What is a chemical reaction? <ul><li>A chemical reaction can be identified based on the change happening in the reaction <...
Chemical reaction produce 4 types of reaction <ul><li>They are………….. </li></ul><ul><li>Precipitation </li></ul><ul><li>Col...
<ul><li>Precipitation </li></ul><ul><li>A bottom of pan : Carbonate compound ( heated water ) </li></ul><ul><li>Calcium Ca...
2. Color Changes <ul><li>Apple is cut or peeled : brown </li></ul><ul><li>Iron : black </li></ul><ul><li>Silver : black </...
3. Gas   <ul><li>Carbide + water : Acetylene ( gas ) </li></ul><ul><li>Acetylene :  </li></ul><ul><li>- welding process to...
<ul><li>Bake a cake: baking soda +  dough + heat : dough expand </li></ul>3. Gas
<ul><li>A firecracker that explodes </li></ul><ul><li>carbide + water : rising temperature on the wall of the glass </li><...
evaluation <ul><ul><li>WRITTEN TEST </li></ul></ul><ul><ul><li>1. Chemical reaction that results in a change of colour hap...
ESSAY <ul><li>After being washed several times, bright colour on clothes will fade out. Do physical or chemical change or ...
<ul><li>Procedural checklist test : </li></ul><ul><li>Identify the following reaction. Fill in the blanks with : precipita...
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The chemical of reaction

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The chemical of reaction

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