Question

Question 10 Mention the conditions necessary for a reaction to occur.​

Answer 1

Answer:  Close contact- For a chemical reaction to take place the reactants should be brought in close contact i.e., they should be mixed.

Sodium + Water → Sodium hydroxide + Water

Solution form- Some substances react with each other only when they are mixed in the solution form, e.g.,

(aq.)

Silvernitrate

​  

+  

(aq.)

Sodiumchloride

​  

→  

(ppt.)

Silvernitrate

​  

+  

(aq.)

Sodiumnitrate

​  

 

Heat-Some reactants need to be heated to undergo a chemical change, e.g.,

Potassium chlorate  

⟶

heat

​  

 Potassium chloride + Oxygen

Light - Some reactions take place in the presence of light.

Carbon dioxide + Water  

chlorophyll

sunlight

​  

 Glucose + Oxygen

Explanation:

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