tonight between pure and impure substances
Answers
Elements and compounds are pure substances.
1. A pure substance has uniform composition and properties in all its parts, as it consists of particles of only one kind. For example, sugar and salt are pure substances.
2. It has certain characteristics such as specific temperatures at which it melts and boils. For example, pure water boils at 100°C.
3. The constituents, which make up a pure substance cannot be separated by physical means.
Impure substances
Mixtures are impure substances.
1. A substance is said to be impure if it has particles of other substances mixed in it.
2. The constituents of impure substances may be present in any ratio.
3. The constituents of an impure substance retain their individual properties. For example, the properties of iron and sand do not change when they are mixed together.
4. The constituents of an impure substance can be separated by physical means.
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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