3. Give one example each of a chemical reaction showing the following characteristics.
a. evolution of a gas
b. change of colour
c. formation of precipitate
d. change of state from liquid to gas
e. change of state from gas to liquid
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Explanation:
a. Evolution of gas
= Acid base reaction.
b. Change of color
= When copper reacts with oxygen, H2O and CO2 give copper carbonate, which changes color from brown to blue or blue green.
c. Formation of precipitate
= Reaction between potassium chloride and silver nitrate.
d. Change of state from liquid to gas
= When water gets heated it forms water vapour(gas).Physical change..
e. Change of state from gas to liquid
= The combustion reaction of candle wax(solid) melts initially to produce melted(molten) wax (liquid) and then produces CO2 (gas) and water vapour (liquid)..
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