A Compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass. OR
A compound is defined as pure substance made up of two or more elements chemically combined together in fix proportion by mass.
Example: water, carbon dioxide, table salt (Sodium chloride), calcium carbonate etc.
Water: (H2O)
Water is a Pure compound made up of two molecules of hydrogen and one molecule of Oxygen Chemically combined together in a fixed proportion that is 1:8 by mass.
Carbon dioxide (CO2) :
Carbon dioxide is a Compound made up of one elements of carbon and two elements of oxygen chemically combined together in a fixed proportion that is 3:8.
Sodium chloride (NaCl)
Sodium chloride is a pure compound made up of two molecules of sodium and chloride chemically combined together in a fixed proportion that is 23:35.5 by mass.
Properties of Compound :
- A compound is always made up of same elements combined together in a fixed proportion by mass for example water compound is made up of fixed ratio that is 1:8 same by mass.
- A compound can not separate by simple physical method.
- Energy in form of heat or light is usually evolved or absorbed when a compound is formed.
- A compound has a definite molecular formula and fixed melting and boiling point.
- A compound is homogenous substance.
- A Chemical compounds is formed as a result of chemical change or chemical reaction and its properties or product properties is different from reactant.
Question Answer:
1) What is Compound?
Answer:A compound is defined as pure substance made up of two or more elements chemically combined together in fix proportion by mass.
2) What are the example of compound?
Answer: Example of compound are water, carbon dioxide, table salt (Sodium chloride), calcium carbonate etc.
3) Write the properties of compound?
Answer: Properties of compound are following.
- A compound is always made up of same elements combined together in a fixed proportion by mass for example water compound is made up of fixed ratio that is 1:8 same by mass.
- A compound can not separate by simple physical method.
- Energy in form of heat or light is usually evolved or absorbed when a compound is formed.
- A compound has a definite molecular formula and fixed melting and boiling point.
- A compound is homogenous substance.
- A Chemical compounds is formed as a result of chemical change or chemical reaction and its properties or product properties is different from reactant.
4) Why water is a compound?
Answer: Water is a compound because Water made up of two molecules of hydrogen (H2) and one molecule of Oxygen (O) Chemically combined together in a fixed proportion that is 1:8 by mass. When is fixed proportion water molecules can formed, other wise if in this ratio few difference occur water cannot be form.