SSC Chemistry notes 7th Chapter Chemical Reaction. The elements present in nature are changing gradually. There are different kinds of changes. Some of the changes are physical and some are chemical. Every change has some effects. Particularly chemical changes have both good and bad effects. So it is mandatory to have proper knowledge about the effects of chemical changes. By studying this chapter, we will be able to know about different types of changes and their effects.
SSC Chemistry notes 7th Chapter Chemical Reaction
The substances existing in nature undergo changes due to the external heat, pressure, and contact with other substances. A chemical substance is composed of one or more than one element. Pure substances have a certain percent of the composition of its elements. Sometimes, changes occur only in physical conditions of substances leaving their percentage composition unchanged. For example, if we place a piece of ice in the open air it will convert to liquid by absorbing heat from the surrounding and if we heat the liquid water at 1000C, water vapor will produce.
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