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प्रश्न
Give two examples for the following case:
Chemical changes
अति संक्षिप्त उत्तर
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उत्तर
- Burning of paper
- Curdling of milk
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
What are oxides ?
Write a short note on the information derived from a balanced chemical equation.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
The water we drink is a combination of hydrogen and oxygen.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Write the chemical reaction of baking soda with lemon.
Why is spoiling food a chemical change?
