Chemical Reaction


 
 
Concept Explanation
 

Chemical Reactions:

The processes in which a substance or substances undergo to produce new substances with new properties are known as chemical reactions. For example, when calcium carbonate is heated, calcium oxide (lime) and carbon dioxide are formed.

CaCO_3 rightarrow CaO + CO_2

The breaking up of calcium carbonate into calcium oxide and carbon dioxide is, thus, a chemical reaction because calcium carbonate changes into substances calcium oxide and carbon dioxide.

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Sample Questions
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Question : 1

The processes in which a substance or substances undergo to produce new substances with new properties are known as __________________ .

Right Option : B
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Question : 2

Which of the following are correct :

(a) The processes in which a substance or substances undergo changes to produce new substances with new properties are known as chemical reactions.

(b) The breaking up of calcium carbonate into calcium oxide and carbon dioxide is a chemical reaction.

(c) When calcium carbonate is heated, calcium oxide (lime) and carbon dioxide are formed.

Right Option : D
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Explanation
Question : 3

Change of milk to curd is a :

Right Option : B
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Explanation
 
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