Physical and Chemical Changes
In a physical change
the nature of the substance, the particles of which it is composed and the
numbers of particles remain unchanged. In a chemical change the properties of
the new substances are different from the original, the particles are different
and the number of particles can change.
The universe is
made up of ………
a) matter
b) energy
c) things
d) light
There exists ……..types of changes in matter?
a) two
b) three
c) four
d) six
Explanation: 1. Physical change and
2. Chemical change
Which of the following change/s take/s place in matter?
a) physical change
b) chemical change
c) biological change
d) both a and b
Physical Changes:
Physical changes are changes affecting the form of a
chemical substance, but not its chemical composition. Physical changes are used
to separate mixtures into their component compounds, but can not usually be
used to separate compounds into chemical elements or simpler compounds.
Which of the
following is/are example/s of physical changes?
a) chopping of wood
b) burning of
paper
c) melting of ice
d) both a and c
