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प्रश्न
What is a chemical change? Give two examples of chemical change?
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उत्तर
A chemical change is a permanent change in which the chemical composition of a substance is changed and a new substance is formed.
Examples:
Heating of copper carbonate
Formation of curd from milk
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संबंधित प्रश्न
Give reason.
Acidic soil is treated with quick lime.
What are biocatalysts ?
Match the column in the following table.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Give an example of a reaction where the following are involved
Catalyst
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Name: A brown gas
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:
Zinc carbonate to zinc oxide
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
Is the conversion of milk into ice cream a chemical change?
