State four conditions for a chemical reaction to take place
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10th
Chemistry
Chemical Reactions and Equations
Chemical equation
State four conditions neces...
CHEMISTRY
State four conditions necessary for a chemical reaction to take place.
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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