大象传媒

  • Bonding, structure and the properties of matter

    • The three states of matter - AQA

      The three states of matter can be represented by the particle model. This model explains the properties of substances in their different states, as well as changes of state.

    • Ionic compounds - AQA

      An ionic compound is made up of charged particles, called ions. It has a giant lattice structure with strong electrostatic forces of attraction.

    • Small molecules - AQA

      A covalent bond is a shared pair of electrons. Covalent bonding forms molecules. Substances with small molecules have low melting and boiling points, and do not conduct electricity.

    • Giant covalent molecules - AQA

      Giant covalent substances have many atoms joined together by covalent bonds. Diamond, graphite and graphene are forms of carbon with different giant covalent structures.

    • Metals and alloys - AQA

      The structure of metals explains their high melting and boiling points and their conductivity. The properties of a metal can be modified by mixing it with another substance to form an alloy.

    • Nanoscience - AQA

      Nanoparticles are 1 nm to 100 nm in size. They have very large surface area to volume ratios. The properties of nanoparticulate substances are different from those of the same substance in bulk.

    • Sample exam questions - bonding, structure and matter - AQA

      Understanding how to approach exam questions helps to boost exam performance. Question types will include multiple choice, structured, mathematical and practical questions.

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