大象传媒

The nature of substances and chemical reactions

Part of Chemistry (Single Science)

  • The nature of substances and chemical reactions

    • Elements, compounds and formulae

      An overview of the definitions of different types of chemicals, how chemicals can be represented in chemical equations, how chemicals can be separated, and a number of important calculations related to chemical formulae.

    • Separating mixtures

      Different experimental techniques are used to separate a variety of mixtures into individual substances. There are also a number of ways to distinguish physical and chemical changes.

    • Chemical equations and calculations

      Reaction information is shown using word and symbol equations. Mass is conserved in chemical reactions. We can predict the masses of products and reactants involved in chemical reactions as no atoms are made or destroyed in chemical reactions. Relative atomic masses can be used to find the relative formula mass of a compound.

    • Further calculations [Higher tier only]

      Calculation techniques for the higher tier to determine the empirical and molecular formulae of a substance, masses of a required substance in a reaction, and calculations involving moles.

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