Class 9 SCI CH 2 - Session 1

1. Is Matter around us
Pure

2. States of Matter

3. What is a Substance?
Anything that cannot be broken into further particles
by applying any physical processes is called
a Substance.
Matter
Matter is anything that has
mass and occupies space.

4. Matter
Pure Substance
Impure
Substance /
Mixture

5. Pure Substance
A substance that consists of only one
type of particle is called a Pure
Substance. For Example, Diamond,
Salt, Sulfur, Tin.

6. Impure Substance / Mixture
When we combine different substances into
each other a mixture is formed. For
Example, Lemonade is a mixture of three
substances, Lemon Juice, Sugar and Water.

7. Pure
Substances
Elements Compounds

8. Elements
Robert Boyle was the first scientist to use the
term element in 1661

9. Elements
Elements cannot be broken down into
further elements by chemical reactions.
Elements
Metals Non-Metals Metalloids

10. Metals are lustrous

11. Metals conduct heat

13. Metals are ductile

14. Metals are Sonorous

15. Properties of Metals
1. Metals are lustrous (shiny)
2. Metals conduct heat and electricity
3. We can hammer metals and form thin
sheets (Malleability)
4. We can convert metals into wires
(Ductility)
5. Metals always produce a ringing sound if
they are hit (Sonorous)
Examples: gold, silver, copper, iron,
sodium, potassium etc

16. Properties of Non-Metals
1. Non-Metals do not conduct heat and electricity
2. Non-Metals are not sonorous, lustrous or ductile
Example: Carbon, Iodine, Chlorine, Oxygen, Hydrogen

17. Metalloids
They show some properties of metals
and some of the non-metals.
Example : Silicon, Germanium

18. Compound
A compound is a substance composed of
two or more elements, chemically
combined with one another in a fixed
proportion.
Example: Salt, sugar, water etc.
NaCl
H2O