what is chemical reaction
The process in which new substances with new properties are
formed from one or more substances is called Chemical Reaction.
* The substances which take part in chemical reaction are called
* The substances which are formed in a chemical reaction are called
- Examples :
(i) Digestion of food
(iii) Rusting of iron
(iv) Burning of Magnesium ribbon
(v) Formation of curd
Chemical reaction involves :
Change in state
Change in colour
Change in temperature
- Evolution of gas
* A chemical reaction can be represented by chemical equation.
It involves uses of symbol of elements or chemical formula of reactant
and product with mention of physical state.
* Thenecessary conditions suchastemperature, pressure orany catalyst
should be written on arrow between reactant and products.
e.g. Magnesium is burnt in air to form magnesium oxide.