Exercise class 8 science chapter 6 composition of matter । exercise composition of matter । Std 8
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Choose the appropriate option and
rewrite the following statements.
The intermolecular force is ........ in the
particles of solid.
minimum ii. moderate iii. maximum
indefinite
Solids retain their volume even when
external pressure is applied. This property
is called ........ . plasticity
incompressibility fluidity elasticity
Matter is classified into the types mixture,
compound and element, by applying the
criterion ........ .
states of matter ii. phases of matters
chemical composition of matter
all of these
Matter that contain two or more
constituent substances is called ........ .
mixture
compound
element iv. metalloid
Milk is an example of type of matter
called ........ .
solution ii. homogeneous mixture
heterogeneous mixture iv. suspension
Water, mercury and bromine are similar
to each other, because three are ........ .
liquids ii. compounds iii. nonmetals
iv. elements
Valency of carbon is 4 and that of oxygen
is 2. From this, we understand that there
are ...... chemical bond/bonds between
the carbon atom and one oxygen atom in
the compound-carbon dioxide.
1 ii. 2 iii. 3 iv. 4
Identify the odd term out and explain.
Gold, silver, copper, brass
Hydrogen, hydrogen peroxide, carbon
dioxide, water vapour.
Milk, lemon juice, carbon, steel.
Water, mercury, bromine, petrol.
Sugar, salt, baking soda, blue vitriol. Hydrogen, sodium, potassium, carbon.
3. Answer the following question.
Plants synthesize glucose in sunlight with
the help of chlorophyll from carbon
dioxide and water and give away oxygen.
Identify the four compounds in this
process and name their types.
b. In one sample of brass, the following
ingredients were found : copper (70%)
and zinc (30%). Identify the solvent,
solute and solution from these.
c. Sea water tastes salty due to the dissolved
salt. The salinity (the proportion of salts
in water) of some water bodies Lonar
lake - 7.9 %, Pacific Ocean 3.5 % ,
Mediterranean sea - 3.8 %, Dead sea -
33.7 %. Explain two characteristics of
mixtures from the above information.
4. Give two examples each
a. Liquid element
b. Gaseous element
c. Solid element
d. Homogeneous mixture
e. Colloid
f. Organic compound
g. Complex compound
h. Inorganic compound
i. Metalloid
j. Element with valency 1
k. Element with valency 2
5. Write the names and symbols of the
constituent elements and identify their
valencies from the molecular formulae
given below.
KCl, HBr, MgBr2
Chemical composition of some matter is given in the following table. Identify the main
type of matter from their.
Name of matter
Chemical composition
Main type of matter
Sea water
Distilled water
H2O
Hydrogen gas filled in a ballon
H2
The gas in LPG cylinder
C4H10 + C3H8
Baking soda
NaHCO3
Pure gold
Au
The gas in oxygen cylinder
O2
Bronze
Cu + Sn
Diamond
C
Heated white powder of blue
vitriol
CuSO4
Lime stone
CaCO3
Dilute hydrochloric acid
HCl + H2O
7. Write scientific reason.
a. Hydrogen is combustible, oxygen helps
combustion, but water helps to extinguish
fire.
b. Constituent substances of a colloid cannot
be separated by ordinary filtration.
c. Lemon sherbat has sweet, sour and salty
taste and it can be poured in a glass.
d. A solid matter has the properties of
definite shape and volume.
8. Deduce the molecular formulae of the
compound obtained from the following
pairs of elements by the cross
multiplication method.
Choose the appropriate option and
rewrite the following statements.
The intermolecular force is ........ in the
particles of solid.
minimum ii. moderate iii. maximum
indefinite
Solids retain their volume even when
external pressure is applied. This property
is called ........ . plasticity
incompressibility fluidity elasticity
Matter is classified into the types mixture,
compound and element, by applying the
criterion ........ .
states of matter ii. phases of matters
chemical composition of matter
all of these
Matter that contain two or more
constituent substances is called ........ .
mixture
compound
element iv. metalloid
Milk is an example of type of matter
called ........ .
solution ii. homogeneous mixture
heterogeneous mixture iv. suspension
Water, mercury and bromine are similar
to each other, because three are ........ .
liquids ii. compounds iii. nonmetals
iv. elements
Valency of carbon is 4 and that of oxygen
is 2. From this, we understand that there
are ...... chemical bond/bonds between
the carbon atom and one oxygen atom in
the compound-carbon dioxide.
1 ii. 2 iii. 3 iv. 4
Identify the odd term out and explain.
Gold, silver, copper, brass
Hydrogen, hydrogen peroxide, carbon
dioxide, water vapour.
Milk, lemon juice, carbon, steel.
Water, mercury, bromine, petrol.
Sugar, salt, baking soda, blue vitriol. Hydrogen, sodium, potassium, carbon.
3. Answer the following question.
Plants synthesize glucose in sunlight with
the help of chlorophyll from carbon
dioxide and water and give away oxygen.
Identify the four compounds in this
process and name their types.
b. In one sample of brass, the following
ingredients were found : copper (70%)
and zinc (30%). Identify the solvent,
solute and solution from these.
c. Sea water tastes salty due to the dissolved
salt. The salinity (the proportion of salts
in water) of some water bodies Lonar
lake - 7.9 %, Pacific Ocean 3.5 % ,
Mediterranean sea - 3.8 %, Dead sea -
33.7 %. Explain two characteristics of
mixtures from the above information.
4. Give two examples each
a. Liquid element
b. Gaseous element
c. Solid element
d. Homogeneous mixture
e. Colloid
f. Organic compound
g. Complex compound
h. Inorganic compound
i. Metalloid
j. Element with valency 1
k. Element with valency 2
5. Write the names and symbols of the
constituent elements and identify their
valencies from the molecular formulae
given below.
KCl, HBr, MgBr2
Chemical composition of some matter is given in the following table. Identify the main
type of matter from their.
Name of matter
Chemical composition
Main type of matter
Sea water
Distilled water
H2O
Hydrogen gas filled in a ballon
H2
The gas in LPG cylinder
C4H10 + C3H8
Baking soda
NaHCO3
Pure gold
Au
The gas in oxygen cylinder
O2
Bronze
Cu + Sn
Diamond
C
Heated white powder of blue
vitriol
CuSO4
Lime stone
CaCO3
Dilute hydrochloric acid
HCl + H2O
7. Write scientific reason.
a. Hydrogen is combustible, oxygen helps
combustion, but water helps to extinguish
fire.
b. Constituent substances of a colloid cannot
be separated by ordinary filtration.
c. Lemon sherbat has sweet, sour and salty
taste and it can be poured in a glass.
d. A solid matter has the properties of
definite shape and volume.
8. Deduce the molecular formulae of the
compound obtained from the following
pairs of elements by the cross
multiplication method.
3 سال پیش
در تاریخ 1400/02/11 منتشر شده
است.
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