Define the conditions necessary for chemical change
Answers
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
Answer:
For chemical change following conditions
are necessary
1. There must be one or more substances to
take part in chemical reaction.
2. There must be release or absorption of
energy during a chemical reaction.
3. There must be one or more new
substances formed during a chemical
reaction.