Category : 10th Class
In this chapter we will study about chemical reactions and equations, balancing of equations, types of chemical reactions, effects of oxidation in daily life and many more.
Let us consider the two process:
In the first process the properties of both sugar and water are present in the solution and no new chemical compound is formed, so it is a physical change. On the other hand in the second process that is cooking of food, the ingredients loose their nature and form a new substance with different properties is formed so this is called a chemical change.
The chemical changes are the outcome of chemical reactions. So the chemical reaction can be defined as the change of one or more substance into other substances having different chemical composition and properties.
For example. Hydrogen (gas) + Chlorine (g) \[\to \] Hydrogen chloride (g)
Carbon (s) + Oxygen (g) \[\to \] Carbon dioxide
Characteristics of Chemical Reactions
Some of the important characteristics of chemical reactions are:
Hydrogen + Oxygen \[\to \] water.
When sodium reacts with water, bubbles of hydrogen gas is seen.
When iron rail is dipped in blue coloured copper sulphate solution, the blue color changes to green.
When water is added to quick lime the mixture becomes hot due to evolution of heat.
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