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.

Answer 1

Chemical changes involve the breaking of bonds in molecules.

Answer 2

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

Step-by-step 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:

`2Na+Cl_2\rightarrow 2NaCl`

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:

`H_2O(s)\rightarrow H_2O(l)`