CHEMISTRY
MATTER
AROUND US
I. Choose the correct answer.
1.
The separation of denser particles from lighter particles done by rotation at
high speed is called ―――.
(a)
Filtration
(b)
sedimentation
(c)
decantation
(d)
centrifugation
[Answer: (d) centrifugation]
2.
Among the following ――― is a mixture.
(a)
Common Salt
(b)
Juice
(c)
Carbon dioxide
(d)
Pure Silver
[Answer: (b) Juice]
3.
When we mix a drop of ink in water we get a ――― .
(a)
Heterogeneous Mixture
(b)
Compound
(c)
Homogeneous Mixture
(d)
Suspension
[Answer: (c) Homogeneous Mixture]
4.
――― is essential to perform separation by solvent extraction method.
(a)
Separating funnel
(b)
filter paper
(c)
centrifuge machine
(d)
sieve
[Answer: (a) Separating funnel]
5.
――― has the same properties throughout the sample.
(a)
Pure substance
(b)
Mixture
(c)
Colloid
(d)
Suspension
[Answer: (a) Pure substance]
II. State whether true or false. If false, correct the
statement.
1. Oil and
water are immiscible with each other.
Answer: True.
2. A
compound cannot be broken into simpler substances chemically.
Answer: False.
Correct statement: A compound can be broken into
simpler substances chemically.
3.
Liquid
- liquid colloids are called gel.
Answer: False.
Correct statement : Liquid - Solid colloids are called gel.
4.
Buttermilk is an example of heterogeneous mixture.
Answer: True.
5. Aspirin
is composed of 60% Carbon, 4.5% Hydrogen and 35.5% Oxygen by mass.
Aspirin
is a mixture.
Answer: False.
Correct statement: It is Compound. It is because
the components are combined in a fixed ratio by
mass.
III. Match the following :
A - B
Element
-Settles down on standing
Compound
- Impure substance
Colloid
- Made up of molecules
Suspension
- Pure substance
Mixture
- Made up of atoms
Answer:
A - B
Element - Pure substance
Compound - Made up of atoms
Colloid - Made up of molecules
Suspension - Settles down on standing
Mixture - Impure substance
IV. Fill in the blanks :
1. A Homogeneous mixture has no distinguishable
boundary between its components.
2.
An
example of a substance that sublimes is Dry
ice / Solid CO2 / Camphor .
3. Alcohol
can be separated from water by Fractional
distillation.
4. In
petroleum refining, the method of separation used is Fractional distillation.
5.
Chromatography
is based on the principle of different
solubilities.
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