Egyptian Language School
Science Department
Prim 4
Model of answer of exercise (3) page114-Page119
Q1:Complete.
1- 1000
9- dark
2-1000
10-ebb
3-cm , m
11-day and night
4-evaporation.
12- planets.
5-metals.
13- 21 %
6- physical , chemical.
14- winter.
7-electricity.
15- carbon dioxide.
8-phases
16-barometer
Q2: Choose the correct answer.
1-length x width x height
7-condenses
2-20
8- sun
3-graduated cylinder containing water.
9-Venus
4-copper
10- full moon
5-gaseous
11-moon around the earth
6-Bromine
12- Wind vane
Q3:Write the scientific term.
1-matter
6-metal
2-gram
7-moon
3-physical change
8-Mars
4-condensation
9-Saturn
5-freezing
10-nitrogen
Q4: Put ( √ ) or ( x ).
1- ( √ ).
7-( √ ).
2- ( X ).
8-( X ).
3- ( √ ).
9- ( X ).
4- ( √
10-( √ ).
).
5-( X ).
11-( X ).
6-( √ ).
12- ( X ).
Q 5: Choose from column (B) what suits in column (A) .
( 1-b )
( 2-a )
( 3-d )
( 4-c )
Q6 : Correct the underlined words .
1- Length.
6-carbondioxide
2- Common balance.
7-spring and autumn
3- Mercury.
8- tide.
4- Gases.
9- anemometer.
5- Carbon.
10-thermometer
Q7: Cross the odd word.
1- Sulphur.
2- Iron.
3- Mercury.
4- Bromine.
5-Green plants
6- Square.
7- Moon.
Q8: What is meant by.
Melting: It is the change in a matter state from solid to liquid by heating.
Mass: It is the amount in an object.
Physical change: It is a change in the appearance of matter without change in it's
structure.
Chemical change: It is a change in structure of a substance producing a new
substance with different properties.
Metal: of element having luster, good conductors of heat and electricity, high
melting point, malleable and ductile .
Q 9:Compare between.
(1)
Physical change
It is a change in the appearance of
matter without change in it's structure.
Chemical change
It is a change in structure of a substance
producing a new substance with
different properties.
Example: melting of wax
Example: burning of wax
(2)
Metal
Has luster
Good conductors of electricity
Good conductors of heat
High melting point
Malleable and ductile
All metals are solids except mercury
which is a liquid.
Example :iron-copper-aluminium-goldzinc and silver
Non-metal
Has no luster
Bad conductors of electricity
Bad conductors of heat
Low melting point
Not malleable or ductile
Non- metals are solids, liquids and
gases.
Example: Carbon, sulphur and
bromine.
(3)
Sun
It is a shiny body
Emit heat and light
Rotate in space
Mars
It is a dark body
doesn't emit heat or light
Rotate around the sun
(4)
Earth
It is a dark body
doesn't emit heat and light
Rotate around the sun
Moon
It is a dark body
It reflects sun light.
Rotate around the earth
(5)
tide phenomenon
It is the rise of water level in water
surface to cover the seashore.
Ebb phenomenon
It is the return back of water to it's
normal level .
(6)
The sequence of the night and day
phenomenon
It is a phenomenon due to rotation of
the earth around it's axis .
During 24 hours.
The sequence of the seasons
phenomenon
It is a phenomenon due to rotation of
the earth around the sun.
During 365 days.
(7)
Maximum temperature
It is the highest expected temperature
during the day time.
Minimum temperature
It is the lowest expected temperature
during the night time.
(8)
Barometer
It is a measuring tool of atmospheric
pressure.
Anemometer
It is a measuring tool of wind speed.
Q 10: what happens when…?
1-The ice changes to water by melting.
2-Iron will rust.
3-The glass will explode.
4-The water will evaporate to water vapour , which exposed to a cold surface and
change to water by condensation.
Q 11:Give reason .
1-Because the Graphite ( carbon ) is a good conductor of electricity.
2-Because it's a good conductor of electricity.
3-Because the sun is the nearest star to us.
4- Because it's a dark body , reflect sun light.
5-Due to rotation of the earth around it's axis .
6- Due to rotation of the earth around the sun.
7-Due to present of carbon dioxide gas.
8- Because it's doesn't burn or even help in burning.
Q 12:Answers
1-what is the importance of the oxygen gas?
 Important for respiration of the living organism.
 Helps in burning fuel.
 Oxygen and acetylene are used in cutting metal.
2-What is the importance of the nitrogen gas?
 Decrease the effect of oxygen in the burning.
 It is used for making ammonia and nitrogenous fertilizers.
3- What is the importance of the carbon dioxide gas?
 Green plants use it for making their food by photosynthesis.
 Used in making soda water.
 Helps to put out fire.
4- What are the benefits of the tide and ebb?




Generating electricity.
Cleaning the coast.
Cleaning the water canal.
Help ships and boats to move.
5- What is the importance of the weather prediction?
People follow weather forecast usually as it gives them the prediction of
temperature, pressure, rains, wind. if the weather prediction:
 The temperature will be low, people must wear heavy clothes.
 The wind will be strong and the sea wave will be high so, it is not allowed
for ships and fishing boats for sail.
 The morning is foggy, car drivers should slow down to avoid accidents.
6- complete the following table:
Physical change
Sugar dissolved in water
Wax melting
Chemical change
Wood burning
Iron rusting
7-Arrange the planets ( the nearest first):
Venus-Earth-Mars-Saturn-Uranus-Neptune