distinguish between pure and impure substances in a table
Answers
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Pure substance:
-Contain two or more kinds of elements chemically joined together.
-Made by chemically reacting elements.
-Always have the same composition.
-Have their own unique and identifying properties differing from the properties of the elements which make them.
-The combined elements may be separated by chemical means.
Mechanical Mixtures
Impure substance:
-Heterogeneous
-Contain two or more substances (elements or compounds).
-Made by physically combining substances.
-The proportions of the mixed substances may vary widely.
-The properties of the mixed substance are not changed when the mixture is formed.
-Substances may be separated by physical means.
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Your Answer:
✒ Pure substance and Mixture (Option A)
❇ Explanation:
On the basis of chemical nature or chemical classification of matter, Matter is divided into two main groups:
Pure substances
Impure substances (mixture)
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Pure substance:
It is a homogenous substance which contains same kind of particles and have definite set of properties. Or Jt is a substance composed of two or more different kind of particles combined in fixed proportion by weight..
That is,
Elements (Can not broken)
Compounds (Can be broken by chemical methods)
✏The composition of a pure substance cannot be altered by physical means. They have definite chemical properties like melting point, density, boiling point etc.
Impure substance (Mixture)
When two or more substances are physically mixed together in any proportion, such that they do not undergo any chemical change, but retain their individual characteristics, the resulting product is called mixture.
Homogenous
Heterogeneous
❇ Explore more!
✒ Characteristics of Pure substances:
A pure substance is homogenous in nature.
A pure substance has a definite set of properties.
The composition cannot be altered by any physical means.
The pure substance has a definite chemical properties like melting point, density etc.
✒ Characteristics of Impure substances:
A mixture can be homogenous or heterogeneous.
The constituents can be separted by physical means or methods.
Energy is neither absorbed or evolved.
No definite chemical properties.
The constituents of a mixture retain their original set of properties.
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