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Separate chemistry 1

Edexcel GCSE ChemistryTopic 5 of 927 lessons

Revision notes for Separate chemistry 1 in Edexcel Chemistry (1CH0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. Transition metals and their propertiesMost metals are transition metals.
  2. Corrosion of metalsCorrosion is the gradual destruction of a metal by reaction with substances in its surroundings, such as oxygen and water.
  3. Preventing rustingIron needs both oxygen and water to rust.
  4. ElectroplatingElectroplating uses electrolysis to coat an object with a thin layer of metal.
  5. Why alloys are stronger than pure metalsA pure metal contains atoms that are all the same size, arranged in regular layers.
  6. Alloy steelsPure iron is soft, bends easily and rusts, so it is not much use for building things.
  7. Uses of metals and alloys related to their propertiesThe use of a metal follows from its properties.
  8. Concentration in mol/dm3 and g/dm3The concentration of a solution tells you how much solute is dissolved in each cubic decimetre.
  9. Core practical: acid-alkali titrationA titration finds the volume of acid that exactly neutralises a fixed volume of alkali.
  10. Titration calculationsA titration result lets you find an unknown concentration or an unknown volume.
  11. Percentage yieldThe theoretical yield is the maximum mass of product that could form, calculated from the balanced equation.
  12. Why the actual yield is less than the theoretical yieldThe theoretical yield assumes every reactant turns into product and every bit of product is collected.
  13. Atom economyA chemical reaction often makes more than one product, and usually only one of them is the one you want.
  14. Calculating atom economyTo calculate the atom economy, first write the balanced equation and pick out the desired product.
  15. Choosing a reaction pathwayA company that wants to make a chemical often has more than one reaction pathway to choose from.
  16. Molar volume of a gasThe particles in a gas are very far apart, so the space taken up by a gas depends on how many molecules there are, not on how big each molecule is.
  17. Gas volumes and masses of solidsMany reactions involve a solid and a gas, for example a metal reacting with acid to give hydrogen.
  18. Avogadro's law and gas volumesAvogadro's law says that equal volumes of different gases, at the same temperature and pressure, contain the same number of molecules.
  19. The Haber processThe Haber process makes ammonia, NH3, from nitrogen and hydrogen.
  20. Rate of reaching equilibriumWhen a reversible reaction takes place in a closed container, the mixture eventually reaches equilibrium.
  21. Industrial conditions and costIndustry wants to make a lot of product, quickly, at a low cost.
  22. Fertilisers and plant growthPlants need certain elements to grow well.
  23. Making ammonium nitrateAmmonia dissolves in water to form an alkaline solution.
  24. Ammonium sulfate: lab and industryAmmonium sulfate, (NH4)2SO4, is a salt used as a fertiliser.
  25. Chemical cellsA chemical cell makes electricity from a chemical reaction.
  26. Hydrogen-oxygen fuel cellsA fuel cell is a cell that makes a voltage from a fuel and oxygen.
  27. Evaluating fuel cellsTo evaluate a fuel cell you weigh its strengths against its weaknesses for a particular use.

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