TEST YOURSELF 1.2 Chemistry 9th Chapter 1

                       

                        TEST YOURSELF 1.2

(1)  Can you identify mixture, elements and compounds out of the followings:

Sr.No	Elements	Compounds	Mixture
1	Aluminium	Sugar	Coca Cola, Ice cream
2	Silicon	Table Salt	Petroleum, Urine
3	Tin	Lime	Blood, Gun powder

(2)    Air is homogenous mixture. Justify. Identify substances present in it.

  Air is homogenous mixture because it has throughout uniform composition. It has no formula. It is a mixture of nitrogen, hydrogen , oxygen and noble gases like Argon (Ar) etc.

(3)     Name the elements represented by following symbols:

  

Sr. No	Symbols	Elements	Symbols	Elements
1	Hg	Mercury	Au	Gold
2	Fe	Iron	Ni	Nickle
3	Co	Cobalt	W	Tungsten
4	Sn	Tin	Na	Sodium
5	Ba	Barium	Br	Bromine
6	Bi	Bismuth	B	Boron

(4)     Name a solid , liquid and a gaseous  element that exist at the room temperature.

Solid elements= Aluminium , Iron ,Gold etc.

Liquid elements= Mercury, Bromine

Gaseous elements= Oxygen, Nitrogen, Hydrogen etc.

(5)    Which element do the following compounds contain?

Sr.No	Compound	Formula	Elements
1	Sugar	C12H22O11	Carbon, Hydrogen and oxygen.
2	Common Salt	NaCl	Sodium and chlorine
3	Lime Water	Ca(OH)2	Calcium, oxygen and Hydrogen.
4	Chalk	CaCO3	Calcium, Carbon and Oxygen.