__________ is a compound made up of hydrogen and oxygen combined in the ratio 2:1 by volume.

_____________ is present in a greater amount in the human body.

The constituent of a __________ cannot be separated by simple physical methods.

_________ is liquid at room temperature.

Each ____________ can be described by its formula, usually called molecular formula.

The smallest particle of an element or a compound which can exist independently and possess its characteristic properties is called its

______________ is a homogeneous solid in solid mixture.

Ozone is an allotrope of 

In a ___________ the constituents may be present in any proportion.

A compound containing silicon and oxygen is