The formation of compounds involve

Water is broken down into small units by passing it through

When iron and sulphur are mixed together at room temperature there is lack of

Due to temperature sensitivity the element which is filled in thermometer, is

Heating, exposing to light or passing electricity will only let to decompose

A substance which cannot be broken into further simpler substance by any chemical reaction is called

Nitric acid is combined with oxygen to produce brown fume of

A process by which new substance is formed, is called

A molecule which breaks and gives of hydrogen and oxygen is

When magnesium element is burnt with oxygen it makes a compound called

Salt, sugar, chalk and sand are all

The gas which is used as cooling agent is

The elements that are named after famous scientists, are

"Cu" is symbol of

Sand is made up of

All elements possess different

On periodic table from left to right, elements change from metal to

Chalk consists of

Elements resting in the same group share same

Carbon, hydrogen and oxygen combine together to make