Write the properties of chemical reaction.

1.	Write the properties of chemical reaction.
Answer» Properties of chemical reaction Iron reacts with oxygen and moisture present in the air, forms the iron oxide (rust). Production of gas: When fuel like petrol, kerosene etc are burnt then carbon present in them reacts with air and forms (CO₂ ) carbon dioxide in the same manner CO₂ is produced when coal is burnt. C + O → CO₂ (gas) When sulphuric acid is poured slowly in a test tube in granulated zinc, hydrogen gas is produced. If a burning matchstick is taken at the mouth of the test tube it burns with an explosion. Change in colour: Colour of cut apple is changed because iron present in apple reacts with oxygen present in the air and form iron oxide. Change of heat: When ammonium chloride is put in water it becomes cold. Dissolution: In hard water, soap does not form foams but produces white undissolved substance.

Answer»

Properties of chemical reaction

Iron reacts with oxygen and moisture present in the air, forms the iron oxide (rust).
Production of gas: When fuel like petrol, kerosene etc are burnt then carbon present in them reacts with air and forms (CO₂ ) carbon dioxide in the same manner CO₂ is produced when coal is burnt. C + O → CO₂ (gas)
When sulphuric acid is poured slowly in a test tube in granulated zinc, hydrogen gas is produced. If a burning matchstick is taken at the mouth of the test tube it burns with an explosion.
Change in colour: Colour of cut apple is changed because iron present in apple reacts with oxygen present in the air and form iron oxide.
Change of heat: When ammonium chloride is put in water it becomes cold.
Dissolution: In hard water, soap does not form foams but produces white undissolved substance.

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Write the properties of chemical reaction.

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