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प्रश्न
What is a chemical reaction?
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उत्तर
A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).
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संबंधित प्रश्न
FILL IN THE BLANK
Negatively charged ions are called ..........
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
What do you observe? When
Water is added to the quick lime.
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
What do you observe when CO2 is passed through lime water first and then a little in excess.
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
