Chemistry

Question

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.

2 Answer

  • Chemical changes involve the breaking of bonds in molecules.
  • Answer: Chemical changes involve the breaking of bonds in molecules.

    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]

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