Definitions [13]
The substances taking part in chemical reaction are called reactants.
Define a photochemical reaction.
A chemical reaction that occurs in the presence of light is called a photochemical reaction.
Define catalyst.
A catalyst is a substance that either increases or decreases the rate of a chemical reaction without itself undergoing any chemical change during the reaction.
Define chemical reaction.
Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.
Define an electrochemical reaction.
An electrochemical reaction is a chemical reaction involving the transfer of electrons, where oxidation and reduction occur simultaneously.
Define the following term:
Precipitate
Chemical reactions which are characterised by the formation of insoluble solid substances are called precipitates.
Define precipitation reaction.
A chemical reaction in which two compounds in their aqueous state react to form an insoluble salt as one of the products.
Define the following term:
Chemical change
A chemical change is a permanent change in which the chemical composition of a substance is changed and one or more new substances with different chemical compositions and different properties are formed.
A chemical change is a process in which the composition of matter changes, resulting in the formation of one or more new substances.
Define electrolysis.
The cell which converts electrical energy into chemical energy is called an electrolytic cell and the process which converts electrical energy into chemical energy is called electrolysis.
The substances formed as a result of a chemical reaction by formation of new bonds are called products.
Define the following terms
Chemical bond
A chemical bond is the force which holds the atoms of a molecule together as in a compound.
Define the following terms:
Effervescence
Formation of gas bubbles in a liquid during a reaction is called effervescence.
