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Question

Classify the following substance as element, compound or mixture:

Graphite


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Solution

Element: An element is a pure substance that cannot be split into simpler substances.

  • Example: Hydrogen (H2), Copper (Cu) etc.

Compound: A compound is a pure substance in which elements combine chemically in a fixed composition to give a compound.

  • They can be broken down into elements that make up the compound by using chemical or electrochemical methods.
  • The properties of the compound are entirely different from the elements from which it is formed.
  • Example: Water (H2O), Common salt i.e.; Sodium chloride (NaCl)

Mixture: When two or more substances (elements or compounds or an element and compound) are mixed in any proportion.

  • The components of a mixture can be separated by physical methods of separation.
  • Example: A mixture of Sand and Iron (Fe) can be separated by the use of a magnet (physical process) where Iron gets attracted to the magnet leaving behind the sand.

Graphite can be classified as an element.

  • This is because graphite is an allotropic form of Carbon (C).
  • Allotrope: Different forms of an element that have the same chemical properties but different physical properties. Example: Graphite and diamond are allotropes of Carbon.
  • Graphite is made up of Carbon particles (i.e.; atoms) arranged in a layered 2-dimensional structure.
  • Graphite contains only one type of constituent particle i.e.; Carbon atoms, therefore it is a pure substance.
  • Carbon atoms cannot be broken down into simpler substances.

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