Quantitative chemistry

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Sample objectives

What this unit covers

• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Explain that the mass of the products equals the mass of the reactants in a chemical reaction.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Represent chemical reactions using balanced symbol equations.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Calculate the relative formula mass of a compound from its chemical formula and relative atomic masses.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Calculate the percentage by mass of an element in a compound given the relative formula mass and relative atomic masses.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Use a balanced symbol equation to explain observed mass changes in a non-enclosed system.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Explain why some reactions appear to involve a change in mass when a gas is a reactant or product.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Make estimations of uncertainty from a set of chemical measurements.
• Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations: Distinguish uncertainty from mistakes or anomalous results when discussing chemical measurements.
• Use of amount of substance in relation to masses of pure substances: (HT only) State that the symbol for the unit mole is mol.
• Use of amount of substance in relation to masses of pure substances: (HT only) Use the number of moles and relative formula mass to calculate the mass of a substance.
• Use of amount of substance in relation to masses of pure substances: (HT only) Substitute numerical values into algebraic equations using appropriate units. (MS 3c)
• Use of amount of substance in relation to masses of pure substances: (HT only) Use mole ratios from coefficients in balanced equations.
• Use of amount of substance in relation to masses of pure substances: (HT only) Use mole ratios calculated from masses to balance a symbol equation.
• Use of amount of substance in relation to masses of pure substances: (HT only) Balance an equation given the masses of reactants and products.
• Use of amount of substance in relation to masses of pure substances: (HT only) Define the limiting reactant as the reactant that is completely used up in a reaction.
• Use of amount of substance in relation to masses of pure substances: (HT only) Explain limiting reactants in terms of amounts in moles.
• Use of amount of substance in relation to masses of pure substances: State that the concentration of a solution can be measured in mass per given volume of solution.
• Use of amount of substance in relation to masses of pure substances: Calculate volume when given mass of solute and concentration.
• Yield and atom economy of chemical reactions (chemistry only): (chemistry only) Explain why some product may be lost when separated from a reaction mixture.
• Yield and atom economy of chemical reactions (chemistry only): (chemistry only) Define yield as the amount of product obtained from a reaction.
• Yield and atom economy of chemical reactions (chemistry only): (chemistry only) Identify the desired product when calculating atom economy.
• Yield and atom economy of chemical reactions (chemistry only): (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful products.
• Using concentrations of solutions in mol/dm3 (chemistry only) (HT only): (chemistry only) (HT only) Explain how concentration in mol/dm3 is related to mass of solute and volume of solution.
• Using concentrations of solutions in mol/dm3 (chemistry only) (HT only): (chemistry only) (HT only) Calculate an unknown concentration when reacting volumes are known and one concentration is known.
• Use of amount of substance in relation to volumes of gases (chemistry only) (HT only): (chemistry only) (HT only) Calculate amount in moles from gas volume at room temperature and pressure.
• Use of amount of substance in relation to volumes of gases (chemistry only) (HT only): (chemistry only) (HT only) Calculate the volume of a gas at room temperature and pressure from its amount in moles.