what is difference between elements, compounds and mixtures
Elements
An element may be defined as the simplest form of matter which can neither be broken into, nor built
from two or more simple substances by any physical or chemical method.
An element is a substance made up of atoms. There are about 115 elements known to man.
Some examples of elements are Carbon, Nitrogen, Helium, Potassium, Iron, Gold, Platinum, etc.
Elements are found in all forms of matter i.e. solid, liquid and gaseous form.
Some elements like nitrogen, oxygen, noble gases and gold occur in the free state or the native state, while most other elements occur in the combined state.
Elements are represented by the symbol e.g. Mercury is represented by Hg, Bromine is represented
by Br. etc.
Compounds
A compound may be defined as a substance formed by the combination of elements in a fixed proportion by weights. It can be decomposed into two or more elements by any suitable method.
Formation and decomposition of compounds can be understood by taking an example i.e. Hydrogen
and Oxygen combine to form water and conversely water is decomposed into Hydrogen and Oxygen
by passing the electric current through it.
Compounds, unlike mixture, cannot be separated by physical means. A compound is represented by a chemical formula indicating the presence of elements and their relative number of atoms. For example, chemical formula of water is represented by H2O which includes two Hydrogen and one Oxygen atoms.
Mixtures
Mixture is obtained by mixing of two or more substances (elements or compounds) in any proportion.
Components retain their individual chemical properties. It can be separated by suitable physical means. Soil, stone, wood, air, water, milk, kerosene, etc. are examples of mixtures. Its properties depend on the nature and amount of the constituents.
There are two types of mixtures :
i. Homogeneous mixture
ii. Heterogeneous mixture.
An element may be defined as the simplest form of matter which can neither be broken into, nor built
from two or more simple substances by any physical or chemical method.
An element is a substance made up of atoms. There are about 115 elements known to man.
Some examples of elements are Carbon, Nitrogen, Helium, Potassium, Iron, Gold, Platinum, etc.
Elements are found in all forms of matter i.e. solid, liquid and gaseous form.
Some elements like nitrogen, oxygen, noble gases and gold occur in the free state or the native state, while most other elements occur in the combined state.
Elements are represented by the symbol e.g. Mercury is represented by Hg, Bromine is represented
by Br. etc.
Compounds
A compound may be defined as a substance formed by the combination of elements in a fixed proportion by weights. It can be decomposed into two or more elements by any suitable method.
Formation and decomposition of compounds can be understood by taking an example i.e. Hydrogen
and Oxygen combine to form water and conversely water is decomposed into Hydrogen and Oxygen
by passing the electric current through it.
Compounds, unlike mixture, cannot be separated by physical means. A compound is represented by a chemical formula indicating the presence of elements and their relative number of atoms. For example, chemical formula of water is represented by H2O which includes two Hydrogen and one Oxygen atoms.
Mixtures
Mixture is obtained by mixing of two or more substances (elements or compounds) in any proportion.
Components retain their individual chemical properties. It can be separated by suitable physical means. Soil, stone, wood, air, water, milk, kerosene, etc. are examples of mixtures. Its properties depend on the nature and amount of the constituents.
There are two types of mixtures :
i. Homogeneous mixture
ii. Heterogeneous mixture.
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