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Question

Classify the following into element, compound and mixture:

silver


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Solution

Silver (Ag) can be classified as an element.

  • This is because silver is made up of silver particles (i.e.; atoms).
  • In the sense that silver contains only one type of constituent particles i.e.; silver atoms, it is a pure substance.
  • Silver atoms cannot be broken down into simpler substances.

It is not a compound because there is no combination of two or more substances as only one substance is present and that is silver only.

  • Similarly, it is not a mixture due to the presence of only one substance.

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 sand.

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