what happens during a chemical reaction ?

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During a chemical reaction new substances are formed with different properties. The total mass and number of atoms remain same , only the rearrangement of atoms take place.

Lets take an example of formation of water from hydrogen and oxygen. The point is , that the hydrogen is an explosive gas and oxygen is essential for combustion but the water formed is used as fire extinguisher.

H2 + O2 → H2O

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