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Breaking down of the ozone layer is a chemical change.
The chemical equation for the destruction of the ozone layer is;
O3 + Cl → ClO + O2
In this process, the new substance that is oxygen is formed from original substance, ozone.
So the destruction of ozone is a chemical change.
Photosynthesis is a chemical change.
During photosynthesis, water and carbon dioxide reacts in presence of light to form new substances that are glucose and oxygen.
12 H2O + 6 CO2 → C6H12O6 + 6 O2 + 6H2O
So photosynthesis is a chemical change.
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