university of malakand

1. Presented by: Zahidullah
Under the supervision of Dr.Romman

2.  The student will be able to define physical and
chemical properties.
 The student will be know about the types of
physical properties.
 The student will be able to differentiate physical
and chemical properties.
 The student will be know about physical and
chemical changes.

3.  Definition
 A physical property is a characteristic that
you can observe with out changing or trying
to change the composition of a substance.

4. Physical property can always be measured
without changing or making the object
chemically different.
There are two types of physical property.
1)Intensive physical properties
2)Extensive physical properties

5.  These are the properties which do not
depend on the size of the object.
 For example
 A small rock will be just as hard as a large
rock.
 softness, hardness, speed, are other
examples of intensive physical properties.

6.  These are the properties which change
depending on how much of the object there
is.
 For example
 A small rocks less than a large rock.
 Volume ,total mass , and weight are the other
examples of extensive properties.

7.  Definition
 A chemical property describes the ability of a
substance to change into a new substance.
 chemical properties can only be observed
when a chemical change occur.
 For example
 Formation of water.
 𝐻2 + 𝑂2 𝐻2O

8. When we burn a wood it changes into C𝑂2 GASS
and energy is released in the form of heat.

9.  Definition
A physical change occur when a
substance change, but no new substance
formed.
All such changes or processes during which the
chemical composition of substance does not
change.

10. Physical change occur when the state of the
substance change.
Actually ,it is associated with the change in physical
properties only while chemical properties remains
unchanged.
 For example
 Freezing, Melting , evaporation
 Physical change are often easy to reverse.
 ICE WATER VAPOURS
 (Solid) (Liquid) (Gas)

11.  A physical change is a temporary change and
substance undergoing such changes alter there
shape, state or volume only while the chemical
composition of the substance remains unchanged.
 For example
 Heating of candle wax.
 Take a small piece of wax in a test tube and heat it.
 The wax will melt into a clear liquid. On cooling,
liquid will harden and change back into solid
candle wax.

13.  Definition
 Chemical change or chemical reaction are
changes that result the production of another
substance.
 A chemical change occur when a new
substance formed.

14.  A chemical change is permanent and can not be
reversed by ordinary physical methods.
 A chemical change is accompanied by.
 1)Gain or loss of heat
 2) production of sound or light
 3)Evolution of a gas or vapours
 4)Change in colour

15.  Most of chemical changes are useful for us but
some are harmful.
 For example
 Plant prepare food during photosynthesis
which is useful for us.
(sunlight)
 Carbon dioxide+water Glucose+ oxygen+Energy
(chlorophyll)

16.  www.encyclopidia.com
 www.slideshere.com
 www.slideplyer.com
 Sadaf Qaiser et al. 2014. physical and
chemical change and process.science.iqbal
series7.94-101.

17. 
thanks