I. Identify what element causes the changes in the following instances. (presence of heat,
lack of oxygen, presence of oxygen)
1. Rusting of metal gate.
2. Cooked food.
3. Fired out candle after being placed in a closed jar.
4. Apple changes its color to brown after being cut.
5. Drying of clothes under the sun.
6. Fish Kill in an overcrowded pond
7. Melting of ice cubes
lack of oxygen, presence of oxygen)
1. Rusting of metal gate.
2. Cooked food.
3. Fired out candle after being placed in a closed jar.
4. Apple changes its color to brown after being cut.
5. Drying of clothes under the sun.
6. Fish Kill in an overcrowded pond
7. Melting of ice cubes
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Answer:
4.apple changes it's color to brown after being cut
Answer:
2,4,6 and 7
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