Answer these questions,
1. Name the catalyst that is used in the preparation of oxygen.
2. Is oxygen soluble in water?
3. Name the by-products that are released during respiration.
4. Is combustion a chemical reaction?
5. Different substances have different ignition temperatures. True or false?
6. Name the compound formed in the process of rusting.
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Answer:
1. Magnesium oxide
2. Soluble at high pressure
3. During respiration CO2, H2O and energy are produced
4. Combustion is a chemical reaction
5. True
6. Ferric oxide