Question

what is meant by chemical reaction???
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Answer 1

Chemical reactions are the processes in which new substances with new properties are formed.

Example: When magnesium ribbon is heated, it burns in air to form a white powder called magnesium oxide.

Mg+ ½O2 →MgO

Answer 2

• A chemical reaction is in which the bonds are broken within reactant molecules, and new bonds are formed within product molecules in order to form a new substance.

• The rate of reaction depends on and is affected by factors like pressure, temperature, the concentration of reactants.

• water + carbon dioxide + light ---> glucose and oxygen .