01.
|
i |
ii |
iii |
iv |
v |
|
C |
C |
A |
A |
B |
02.
i)
An element is a pure substance which cannot be split into
simpler substances by any chemical means. Example Iron, silver, gold, Aluminium
etc
ii)
A compound is a pure substance that is made up of two or more
elements in chemical combination.
iii)
A mixture is a physical combination of two or more substances
in any ratio.
iv)
A solvent is a component of the solution that dissolves other
substances.
v)
A solute is the component in a solution that is dissolved in
a solvent.
03. (a) Differences between mixture and
compounds
|
Mixtures |
Compounds |
|
Compounds may be seen separately |
Components cannot be seen separately |
|
The components can be separated from
one another by physical method |
The constituent elements cannot be
separated by physical means |
|
Mixtures may vary widely in
composition. The elements are mixed in any ratio |
Compounds always have definite
compositions by mass of the elements. The properties cannot be changed |
|
No chemical change takes place when a
mixture is formed |
When new substances are formed, they
involve a chemical change |
|
The properties of a mixture are those
of the individual elements |
The properties of compounds are very
different from those of individual elements |
(b)
Differences between suspensions and solutions
|
Solution |
Suspension |
|
It is homogeneous |
It is heterogeneous |
|
It is transparent or clear |
It is opaque or not clear |
|
Particles are completely dissolved |
Particles separates on standing |
|
Components are separated by
evaporation |
Components are separated by filtration
|
04. Uses of solvents
Solvents
can be used:
ü As the bleaching agent
ü As stain removal
ü As varnish removal
ü As degreasing
ü For cleaning
05.
i)
Immiscible liquids
ii)
Immiscible liquids
iii)
Miscible liquids
iv)
Immiscible liquids
v)
Miscible liquids
06.
i)
Sublimation
ii)
Layer separation (using separating funnel)
iii)
Fractional distillation
iv)
Magnetic
v)
Solvent extraction
