Pure Substances
Pure Substances
In chemistry when we say a substance is pure, it means that the substance is made up of only one type of constituent particles. A pure substance consists of a single type of particles. In other words, a substance is a pure single form of matter.
Depending upon the chemical composition, matter is classified into elements, compounds (i.e. pure substances that are non separable by physical methods) and mixtures (separable by physical methods like sublimation).
Pure substances: Substance that consists of only single type of constituent particles is called pure substance like gold, water etc. It can be of two types: elements and compounds.
Characteristics and Properties of Pure Substances :-
Pure substances are mostly homogeneous in nature containing only one type of atoms or molecules.
These substances mainly have a constant or uniform composition throughout.
The substances have fixed boiling and melting points.
A pure substance usually participate in a chemical reaction to form predictable products.
Examples of Pure Substances :-
All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond etc. Compounds such as water, salt or crystals, baking soda amongst others also grouped as pure substances.
Which of the following statements is false with regard to molecules? | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) Pure substances mainly have a constant or uniform composition throughout. (b) Pure substances are mostly homogeneous in nature containing only one type of atoms or molecules. (c) Pure substances have fixed boiling and melting points. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct ? | |||
| Right Option : D | |||
| View Explanation | |||
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