Answer: Forming oxygen By bubbling flourine through water
Explanation:
Chemical change is the change in which chemical composition of the substance changes by rearrangement of atoms.
Physical change is a change in which only the physical properties such as size, shape etc change and there is no rearrangement of atoms.
1. Dissolving two cups of flour in a liter changes the state and hence is a physical change.
2. Pouring water from a large trough into a beaker is a physical change.
3. Decreasing the motion of water molecules by freezing changes the state and hence is a physical change.
4. Forming oxygen By bubbling flourine through water involve rearrangement of atoms and thus is a chemical change.
[tex]F_2+H_2O\rightarrow 2HF+O_2[/tex]
