4. What will you take into account while
identifying the following ?
(a) A physical change in a substance.
(b) A chemical change in a substance.
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Physical changes are those changes in which only the forms of substances get modified; the chemical natures and compositions of the substances involved are not altered. Characteristics: No new substance is formed during a physical change. Most physical changes can be reversed easily.
b.Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. ... An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
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