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Chemistry 0620

3. Stoichiometry

Formulae, equations, relative masses, the mole, concentration and yield calculations.

  1. 3.1

    Formulae

    Writing formulae of ionic and covalent compounds and balancing chemical equations.

    Full lesson2 questions4 cards
    • 3.1.1Write and balance chemical equations, including state symbols.
    • 3.1.2Deduce the formula of an ionic compound from the charges on its ions.
  2. 3.2

    Relative masses of atoms and molecules

    Relative atomic mass and relative formula mass, and percentage composition.

    Full lesson2 questions3 cardsReview first: 3.1
    • 3.2.1Define relative atomic mass and relative formula mass and calculate Mr from a formula.
  3. 3.3

    The mole and the Avogadro constant

    Moles from mass and from concentration, gas volumes, reacting-mass calculations, empirical formulae and yield.

    Full lesson3 questions5 cardsReview first: 3.2
    • 3.3.1Use the relationship between mass, relative formula mass and number of moles (n = m / Mr).
    • 3.3.2Use the mole ratio in a balanced equation to calculate reacting masses.
    • 3.3.3Calculate concentration in mol/dm³ and g/dm³ and use it in titration calculations.
    • + 2 more objectives