Ex

  Chemistry (NTSE/Olympiad)  

2. Is Matter Around Us Pure

Pure Substances

(B) Compounds :
A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass. A compound is formed as a result of chemical reaction, between the constituent elements. The properties of compound are different from the properties of the elements from which it is formed.
Example. Water (H2O) is a compound made up of two elements, hydrogen and oxygen, chemically combined in a fixed proportion of 1 : 8 by mass
Compounds can be further divided into three classes : acids, bases and salts, on the basis of their properties.
Example. Sulphuric acid is an acid, sodium hydroxide is a base whereas sodium sulphate is a salt.
Characteristics of a compound
In a compound constituents are present in definite proportion by mass
The properties of a compound are different from the properties of its constituents.
The constituents of a compound cannot be separated by simple physical processes
Formation of a compound is generally accompanied by evolution of energy in the form of heat or light.
A compound has a fixed melting point and boiling point.
A compound is always homogeneous in nature.

If you want to give information about online courses to other students, then share it with more and more on Facebook, Twitter, Google Plus. The more the shares will be, the more students will benefit. The share buttons are given below for your convenience.
×

NTSE Chemistry (Class X)


NTSE Chemistry (Class IX)


SHOW CHAPTERS

NTSE Physics Course (Class 9 & 10)

NTSE Chemistry Course (Class 9 & 10)

NTSE Geography Course (Class 9 & 10)

NTSE Biology Course (Class 9 & 10)

NTSE Democratic Politics Course (Class 9 & 10)

NTSE Economics Course (Class 9 & 10)

NTSE History Course (Class 9 & 10)

NTSE Mathematics Course (Class 9 & 10)