IS MATTER AROUND US PURE

Class -9
Subject: Science Chapter: 02 – Is matter around us pure?
(Pure and Impure)

1.
Define the following term :

a. An element is
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b. A compound is
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c. A mixture is
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d. A homogenous mixture is
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e. A heterogenous mixture is
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f. A physical change is
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g. A chemical change is
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h. Metalloids are
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2.
a. Examples of solutions are
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b. Examples of suspensions and colloids are:
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3. Classify the substance given in the figure below into elements and compounds.

Cu                                          CaCO3
F2
NaCl(aq)
O2
Hg
Zn
Wood
Sand
Diamond
H2O

4. Differentiate between mixtures and compounds

Mixtures                                                                   Compounds


5. Write the difference between metals and non metals based on the following properties

Properties

Lustre

Sonority

Tensile Strength


Electrical conductivity

Acidic/Basic Nature