How are chemical and physical changes different on a molecular level?
Chemical changes involve the breaking of bonds in molecules.
Physical changes do not involve molecules.
Physical changes cause new molecules to form.

Explanation: Chemical change is a change in which there is rearrangement of atoms and thus there is formation of new substances which happens by making and breaking of bonds.

Example of chemical change:

[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]

Physical change is a change in which there is no rearrangement of atoms and thus there is no formation of new substances , thus no making or breaking of bonds is involved. It only involves changes in states.

Example of physical change:

[tex]H_2O(s)\rightarrow H_2O(l)[/tex]

How are chemical and physical changes different on a molecular level? Chemical changes involve the breaking of bonds in molecules. Physical changes do not involve molecules. Physical changes cause new molecules to form.

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How are chemical and physical changes different on a molecular level?
Chemical changes involve the breaking of bonds in molecules.
Physical changes do not involve molecules.
Physical changes cause new molecules to form.