Download General exercise model answer Exercise 1 page 90 to 93 Question

General exercise model answer
Exercise 1 page 90 to 93
Question (1) complete the following
1-1meter cube
2-29.5 days /365.25days
3-day and night/four seasons
4-metal/non-metal
6-physical
7-Mercury/Neptune
8-liquid/ solid
Question(2) choose the correct answer
1. Jupiter
2. carbon
3. 8
4. condensation
5. aluminum
Question(3) write scientific term
1-matter
2- stars
3- iron rust
4- planet(earth)
5-moons
Question (4) give reason
1-because it reflects the sunlight .
2-because it is a solid and solids have definite shape and volume.
Question(5) match
1-Mercury (e)
2-the earth (f)
3-Jupiter (b)
4-Neptune(c)
5- Mars (a)
Question (6)
The least volume and mass is object 4 x 4 x 1= 16 cm3
Question (7) give reasons:
1. Due to rotation of the Earth around its axis.
2. Due to revolution of the Earth around the Sun.
Question (8)
- The element is a metal if:
o It has lustre and conducts heat and electricity. (malleable and ductile)
- The element is non-metal if:
o It has no lustre and bad conductor of heat.
Exercise 2 model answer
Book p(94 to 96)
Question 1: Give reason for:1. -because they are metals
2. -because the axis of earth is inclined
3. -because water vapor in the air condenses on the cold surface forming water
drops
4. -because carbon is a good conductor of electricity
5. -because iron is malleable and ductile
6. because Uranus is very cold as it has no atmosphere.
Question 2: Choose the correct answer:1. -b
2. -b
3. -c
4. -b
5. -a
Question3: Correct the following sentences:1. Measuring cylinder is used to determine the volume of irregular solids.
2. The mass of equal volumes of different materials is different.
3. Freezing is the change of matter from liquid state to solid state.
4. Element is the simplest form that a matter found on it.
5. Adding table salt to water and stir it, table salt disappears and salty solution
is formed.
6. The sun is a star and it emits light.
Exercise 3 model answer
From page 94 to page 101
Question (1) complete the following sentences
1. 1000
2. 1000
3. meter or centimeter
4. evaporation
5. gold
6. physical / chemical
7. electricity
8. dark
9. day and night
10. planets
11. 21%
12. winter
13.Carbon dioxide
Question (2) choose the correct answer
1- Length X width X height
2- 20 centimeter cube
3- Graduated cylinder containing water
4- Copper
5- Gaseous
6- Bromine
7- Condenses
8- Sun
9- Venus
Question (3) write the scientific term
1- Matter
2- Gram
3- Physical change
4- Condensation
5- Freezing
6- Metals
7- Moons
8- Mars
9- Saturn
10Nitrogen
Question(4) put true or false
1. true
2. false
3. true
4. true
5. false
6. true
7. true
8. false
9. false
10.true
11.false
12.false
Question (5) correct the underlined word
1-length
2- common balance
3- Mercury
4- gases
5- carbon
6- carbon dioxide
7- spring and fall
Question (6) cross the odd word
1. Sulphur
2. Iron
3. Mercury
4. Bromine
5. moon
Question (7 ) what is meant by
1Melting:is the change of matter from solid state to liquid state by
heating
2Mass: is the amount of matter in an object
3Physical change: is the change in the appearance only without change
in structure or properties
4Chemical change: is the change in appearance , structure , properties
producing new substance
5-
Metal: a group of elements which have luster, are good conductors of
heat and electricity , malleable and ductile, have high melting and
boiling point.
Question (8) compare between
1-Physical change
Change in appearance only
Examples: melting wax
Grinding sugar
Dissolving salt in
water
Cutting paper
Chemical change
Change in structure ,
properties producing new
substance
Examples: fermentation of
fruits
Adding yeast in baking
Preparation of yoghurt
Burning of sugar
Iron rust
2-
Metals
Non-metals
Luster
They have luster
They do not have luster
Electrical conductivity
They are good
conductors of electricity
They do not allow
electricity to pass so they
are called
Insulators
Except carbon
Heat conductivity
They are good
conductors of heat
They are bad conductors
of heat
Malleability and ductility Malleable and ductile
They are not malleable
and ductile
Melting and boiling
point
They have high melting
and boiling point
They have low melting
and boiling point
Examples
They are solids as silver
And copper
Except Mercury which is
a liquid
Solids as carbon , sulphur
,phosphorus
Liquids as bromine
Gases as oxygen
3- sun
Mars
Is a shiny body that
radiates heat and
light
Is a dark body
Rotates around its
inclined axis
Revolves around
the sun
It is a planet
It is a star
4-earth
It is a planet
It is a dark body that
revolves around the sun
It does not appear shiny
Moon
It is not a planet
It is a dark body that
revolves around the earth
It appears shiny because
it reflects the sunlight
5-sequence of day and
night
Due to rotation of earth
around its inclined axis
Sequence of seasons
Due to revolution of
earth around the sun
Question (9) what happens when
1- The ice melts and changes to water by heating
2- The iron nail will rust (brittle brown layer formed on it)
3- The water freezes and changes to ice by cooling and then it will explode
4- When water boils, it produces water vapor which condenses to water drops
when it touches a cold surface.
Question(10) give reason
1. -because graphite is the only non-metal that is a good conductor of electricity
2. -because it is malleable and ductile, and good conductor of electricity
3. - Because it is the nearest star to us
4. -because it is a dark body that rotates around its axis and revolves around the
sun in a fixed orbit
5. -due to rotation of the earth around its inclined axis
6. -due to revolution of earth around the sun in a fixed orbit
7. – because on blowing carbon dioxide gas which turns lime water turbid.
8. -because carbon dioxide does not burn and doesn’t help in burning
Question (11) answer the following
1- Oxygen is important in :respiration of all living organisms
.
Burning of fuels
Divers use it to breathe under water
2- Nitrogen is important in : decrease the effect of oxygen in burning
.
In the industry of ammonia and nitrogenous
fertilizers
3- Carbon dioxide is important in : plants use it to make their own food by
photosynthesis process
Used in making soda water
Used in fire extinguishers to put off fires because it
doesn’t burn or help in burning
4Physical change
Chemical change
Sugar dissolving in water
Wax melting
Wood burning
Iron rusting
5-Venus-Earth-Mars-Saturn-Uranus-Neptune
Book Model exam (1) Answers p.(102- 103
1- Complete the following sentences:
a- big masses
b- Carbon dioxide
c- Earth
d- Mercury
e- Chemical
2- Put (√) or (X) :
a- true
b- false
c- true
d- False
e- true
3- Choose the correct answer:
a. Dissolving of salt in water
b. Graduated cylinder.
c. Aluminum.
d. Evaporation.
e. 21%
4- a) Give reason for:
1- Because it reflects the sun light.
2- due to revolution of earth around the sun.
b) Write the scientific term:
1. Planets
2. physical change
3. sensitive balance.
Book Model exam (2) Answers p. (104- 105)
1- Write the scientific term:
a- Evaporation.
b- Sun
c- Gases
2- Complete the following sentences:
a- stars
b- 21%
c- chemical change
d- big masses
e- eight
f- physical
3- Put true or false:
a- false
b- true
c- true
d- false
e- true
4- a) give reason for:
1- due to the rotation of the earth around its inclined axis.
2- due to the presence of carbon dioxide in air.
b) What happens when…?
1- The water will become ice and the bottle will explode if it is completely
filled.
2- Condensation of the water vapor on the cold surface forming water droplets.