physical and chemical change
Answers
Answer:
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
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. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Answer:
Changes that can be reversed are called physical changes
No new substance is formed in this change
E. g: cutting of wood
Changes that cannot be reversed are called chemical changes
New substances are formed
E. g : burning pf paper
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