REVISION WORKSHEET - SORTING MATERIALS AND SEPARATION OF SUBSTANCES

Good morning boys !
 Please do the revision worksheet given below  in your science notebook. (Lessons -sorting materials and separation of substances)

1. FILL IN THE BLANKS-
a) Stones can be removed from pulses  by using the method of .........
b) Substances that have a shine are said to be  possess  .........
c) ............. soilds present in water can be seperated by the process of filtration.
d) Light can pass totally through ............... materials.
e) Wires are made of metals because they are good conductors of ...........
f) Aquatic plants use ............... gas present in water for the process of photosynthesis.
g) Silver loses its lustre when it comes in contact with .............. and ...............
h) In a salt solution , ............. is the solute and ........... is the solvent.
i) Dust particles settle down when it rains by the process called ...............
j) Grains can be separated from stalks by the method of .................
k) Aerated soft drinks contain ............ dissloved in them.
l)Cream can be separated from butter by the process of ...............
m) Salt is separated from sea water by the process of .................
n) The solubility of gases in water ............... with rise in temperature.

2.GIVE ONE EXAMPLE OF EACH OF THE FOLLOWING-

a) A method that can be used to separate salt from sand. ...........
b) Immiscible liquids. ....................
c) A method that can be used to separate a insoluble solid from a liquid.  ...................
d) A magnetic substance. ..................
e) A good conductor of heat. ...................
f) A mixture ................
g) A pure substance. ......................
h) Naturally occuring material.  ..............
i) Homogeneous mixture. ........

3. CHOOSE THE ODD ONE OUT AND GIVE A REASON-
a) Aluminium ,copper ,silver .plastic
b) hand picking , filtration . sieving, winnowing
c) oil in water ,lime juice in water, orange squash in water, alcohol in water
d) Book ,wood ,metal , acrylic sheet
e) Air  , bakelite , copper , wood
f) Gold , wood , silver ,copper
g) Ground glass , metal, waxed paper, oily paper
h) Nitrogen , oxygen , methane,helium


4. WRITE THE SCIENTIFIC TERMS-
a) Substances that allow some light to pass through them. ..........
b) Substances that do not allow electricity to pass through them. ............
c) Two liquids that mix with each other totally. ......
d)  Method of separation of grains from chaff. ...............
e) When a solute completely dissolves in a solvent. .........
f) Putting similar things together.   .................
g) Materials which get attracted by a magnet. ..........
h) A solution in which no more solute can be dissolved at any given temperature.  ................
i)A mixture in which   particles of the various  substances are uniformly distributed. ..............
j) Settling down of the finner particles faster by dissolving a small quantity of alum in muddy water. ................
k) Separating clear liquid without disturbing the settled solid particles simply by transferring. ...................


ANSWERS-
 1. a) handpicking
b)luster
c)insoluble
d) transparent
e) electricity
f) carbon dioxide
g) air , water (moisture)
h) salt , water 
i) loading
j) threshing
k) carbon dioxide
l) churning
m) evaporation
n) decreases

2. a) evaporation
b) oil and water
c) filtration
d) iron
e) copper
f) air
g) oxygem
h) wood
i) air

3. a) Plastic. It is an insulator or does not possess lustre.
b) filtration. Others are methods of separating solid impurity from solids.
c) oil in water. They are immiscible liquids
d) Acrylic sheet . Others are opaque.
e) copper. Others are insulators
f) wood. Others are conductors.
g) wood. Others are translucent.
h) oxygen. Others are insoluble gases in water.

4. a) Translucent
b) Insulators
c) Miscible liquids
d) Threshing
e) Solution
f) Grouping
g) Magnetic materials
h) Saturated solution
i) Homogeneous mixture
j) Loading
k) Decantation