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What is the Difference between Elements,Compounds and Mixtures ?

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  • Mixtures

    • Components are present in any ratio.

    • Homogeneous mixture − Uniform composition throughout the mixture.

    • Heterogeneous mixture − Non-uniform composition throughout the mixture.

    • Components can be separated by physical methods such as hand picking, filtration, crystallization, distillation, etc.

  • Pure substances

    • Fixed composition

    • Constituents cannot be separated by simple physical methods.

    • Elements contain only one type of particles − atoms (example Na, K, Cu, C, Ag) or molecules [Example: H2, N2, O2, F2]

    • Compounds are formed by the combination of two or more atoms of different elements. [Example: water (H2O), carbon dioxide (CO2)]

    • Constituents of compounds cannot be separated by physical methods; they can be separated by chemical methods only.

 

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Elements, Compounds & Mixtures

Elements

 

Microscopic view of atoms of an element (gas phase).Microscopic view of molecules of an element (gas phase).
Microscopic view of the atoms of the element argon (gas phase).Microscopic view of the molecules of the element nitrogen (gas phase).

Note that an element:

  • consists of only one kind of atom,
  • cannot be broken down into a simpler type of matter by either physical or chemical means, and
  • can exist as either atoms (e.g. argon) or molecules (e.g., nitrogen).

A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. Note that the two nitrogen atoms which comprise a nitrogen molecule move as a unit.

Compounds

 

Microscopic view of molecules of a compound (gas phase).
Microscopic view of the molecules of the compound water (gas phase). Oxygen atoms are red and hydrogen atoms are white.

Note that a compound:

  • consists of atoms of two or more different elements bound together,
  • can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means),
  • has properties that are different from its component elements, and
  • always contains the same ratio of its component atoms.

Mixtures

 

Microscopic view of a mixture of two elements and a compound (gas phase).
Microscopic view of a gaseous mixture containing two elements (argon and nitrogen) and a compound (water).

Note that a mixture:

  • consists of two or more different elements and/or compounds physically intermingled,
  • can be separated into its components by physical means, and
  • often retains many of the properties of its components.

 

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elements - only contain one type of atom and the list of elements is the periodic table, i.e. O2

compounds - a mix of two or more atoms, i.e. H2O

Mixture - combination of two or more compound/molecule... i.e. sand

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the definition of elements and compounds has been universally changed in case u dont knw 

the new definitions are as follows :

elements - they are molecules containig same kind of atoms

compounds - they are molecules that contains differnt kind of atoms

all the best of luck !!!!!!!!!!!!!!!!!!

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