Shreya bought a new flower vase made of copper. After a few months, she found that
the vase has lost its lustre and there was a greenish deposit on its surface.
a) What are the compounds present in that greenish deposit?
b) Write necessary chemical reaction taking place in this case.
Answers & Comments
Answer:
(a)The green material is a mixture of copper hydroxide and copper carbonate.
(b)State four conditions necessary for a chemical reaction to take place.
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.)SSilvernitrat(aq.)SSodiumchlorid → (ppt.)SSilvernitrat + (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 chlorophyllsunlight
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