Question

explain in short way but in meaningful sentences of this question 1) physical changes 2) chemical changes

Answer 1

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.[1]

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. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. Understanding chemical changes is a major part of the science of chemistry.

Answer 2

1) Physical changes are changes affecting the form of a chemical substances, but not its chemical composition.

2) Chemical changes are changes of material into other, new materials with different properties and one or more new substances are formed.

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