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Key words and definitions

Enthalpy change remains consistent despite the path taken in a reaction. Skeletal formula illustrates how atoms bond, while auto-ignition creates engine sound. Homologous series and enthalpy change definitions further delve into chemical concepts.

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Key words and definitions

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  1. Key words and definitions

  2. Key word(s) ? As long as your starting and finishing points are the same, the enthalpy change will always be the same. This is regardless of how you go from start to finish

  3. Definition ? Skeletal formula

  4. Definition ? Unsaturated

  5. Key word(s) ? This shows how all the atoms in a molecule bond to each other

  6. Key word(s) ? The sound which comes from an engine if auto-ignition occurs

  7. Definition ? • 298 K (25oC) for temperature • 1 atmosphere for pressure • 1 mol dm-3 for concentrations of solutions

  8. Definition ? Homologous series

  9. Key word(s) ? This is the energy required to pull the atoms bonded in a gaseous compound apart e.g. H2(g)  2H(g). This is always positive

  10. Definition ? HC

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