write the characteristics of chemical reactions with the help of some chemical reactions and colorful 2D and 3D pictures.
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- Some chemical reactions are characterised by the evolution of gas. For Ex:1)Reaction between zinc and dilute sulphuric acid to form hydrogen gas. 2)Reaction between sodium carbonate and dilute hydrochloric acid to form carbon dioxide gas. Some chemical reactions are characterised by the formation of precipitate.
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The characteristics of a chemical reaction are :
☞Evolution of gas.
☞Formation of a precipitate.
☞Change in color.
☞Change in temperature.
☞Change in state.
☞Formation of new substances.
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