The intercoversion of states is a physical change because these changes occur without a change in composition and no change in the chemical nature of the substance. Burning is a chemical change. During this process one substance reacts with another to undergo a change in chemical composition. Classify the following as physical or chemical properties: (11) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas. (12) Metallic sodium is soft enough to be cut with a knife. (13) Most metal oxides form alkalis on interacting with water. 14) On heating, calcium carbonate gets converted into calcium oxide and carbon dioxide.
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green plants synthesis food for themselves by the process of photosynthestis
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