Video lecture (English) of C06 Quantitative Chemistry
C06 Quantitative Chemistry
What’s on the Specification
C4.1 Use $A_r$ values to calculate the relative molar mass, $M_r$.
C4.2 Know that Avogadro’s number gives the number of particles in one mole of a substance.
C4.3 Know that one mole of a substance is the $A_r$ or $M_r$ in grams, and perform conversions ofgrams to moles and vice versa (including working in tonnes and kilograms). Know that the amount of a substance corresponds to the number of moles of a substance.
C4.4 Calculate the percentage composition by mass of a compound using given $A_r$ values.
C4.5 Know that the empirical formula is the simplest integer ratio of atoms in a compound. Find the empirical formula of a compound from a variety of data, such as the percentage composition by mass of the elements present or reacting masses. Find the molecular formula from the empirical formula if given the $M_r$ value.
C4.6 Use balanced chemical equations to calculate the masses of reactants and products, including if there is a limiting reactant present.
C4.7 Be able to construct balanced chemical equations from reacting masses or gas volumes data.
C4.8 Understand that (for an ideal gas) one mole of a gas occupies a set volume at a given temperature and pressure (for example, $24 \mathrm{dm}^3$ at room temperature and pressure (rtp)).and perform conversions of volumes to number of moles, and vice versa
C4.9 Solutions:
– a. Understand that concentration can be measured in $\mathrm{mol} \mathrm{dm}^{-3}$ or $\mathbf{g ~ d m}^{-\mathbf{3}}$, and beable to calculate the concentration given the number of moles (or mass) of soluteand the volume of solution.
– b. Know the term saturated solution, be able to calculate solubility and interpret solubility data.
C4.10 Use the concentrations of solutions (or find the concentrations from given data) and the reacting ratio of reactants from the balanced equation to perform titration calculations.
C4.11 Calculate the percentage yield of a reaction using the balanced chemical equation and the equation: percentage yield $= \frac{\text { actual yield }(\mathrm{g})}{\text { predicted yield }(\mathrm{g})} \times 100$
Learning Objectives
- Know the Avogadro’s constant and use value to calculate the relative molar mass, .
- Calculations from equations.
- Know the term saturated solution and calculate solubility.
- Know titration calculations.
- Calculate the percentage yield.
Suggested Time
| Task | No. of Questions | Suggested Time |
|---|---|---|
| Examples | 14 | 20 min |
| Quiz | 12 | 20 min |
| Practice A | 23 | 40 min |
| Practice B | 20 | 40 min |
| Total | 69 | approx. 2 hrs |
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