ls 3 science 1 chemical reaction and equation

A chemical reaction is a process in which some substances undergo Bond breaking and are transformed into new substances by formation of newbonds

What is a chemical reaction

Substances taking part in chemical reaction are called as reactants and substances formed as a result of chemical reaction by formation of newborn are called as products

What are products and reactants

Give an example of chemical reaction?

Formation of carbon dioxide gas by combustion of coal in air is a chemical reaction

During physical change only the state of matter changes and these changes are often temporary in nature

What is a physical change

Word equation

A simple way of representing a chemical reaction in words is called a

Chemical equation

The representation of a chemical reaction in a condensed form using chemical formula is called

Balanced equation

If the number of atoms of the elements in the reaction in the equation is same as the number of atoms of those elements in the products such an equation is called a

Unbalanced equation

If the number of atoms of each element is not the same on the two sides of the equation it is called an

Combination reaction

When two or more reactants combined in a reaction to form a single product it is known as a

Decomposition reaction

The reaction in which there is only one reactant giving rise to two or more products is called

Electrolysis

Water decomposes into hydrogen and oxygen gases on passing electric current through acidulated water this decomposition takes place by means of electric energy and it is called

Displacement reaction

The reaction in which the place of the ion of a less reactive element in a compound is taken by another more reactive element by formation of its own ion is called

Endothermic processes

The process in which heat is absorbed from the outside is called

Exothermic processes

When the processes in which heat is given out are called