SC9 Calculations involving masses SC9a Masses and empirical formulae Step Learning outcome Had a look Nearly Nailed it! Calculate the relative formula mass of a substance from relative atomic masses. Calculate the empirical formula of a compound from the masses of the elements it contains. Explain the difference between an empirical formula and a molecular formula. Deduce the empirical formula from a molecular formula. Deduce the molecular formula for a compound from its empirical formula and its relative formula mass. Describe an experiment to determine the empirical formula for a compound. SC9b Conservation of mass Step Learning outcome Had a look Nearly there Nailed it! Explain the law of conservation of mass in a closed system. Explain the law of conservation of mass in a system. Calculate the mass of product formed from a given mass of reactant, using a balanced equation. Calculate the mass of a reactant needed to produce a given amount of product, using a balanced equation. Calculate the concentration of a solution in g dm–3. SC9c Moles H Step Learning outcome Had a look Nearly there Nailed it! H Describe what is by a mole of particles. H Calculate the number of moles of particles in a given mass of a certain substance and vice versa. H Calculate the number of particles in a given number of moles or mass of a substance and vice versa. H Explain that the mass of a product formed in a reaction is controlled by the mass of reactant that is not in excess. H Deduce the balanced equation for a reaction from the masses of reactants and/or products.
SC9 Calculations involving masses SC9a Masses and empirical formulae Step Learning outcome Had a look Nearly Nailed it! Calculate the relative formula mass of a substance from relative atomic masses. Calculate the empirical formula of a compound from the masses of the elements it contains. Explain the difference between an empirical formula and a molecular formula. Deduce the empirical formula from a molecular formula. Deduce the molecular formula for a compound from its empirical formula and its relative formula mass. Describe an experiment to determine the empirical formula for a compound. SC9b Conservation of mass Step Learning outcome Had a look Nearly there Nailed it! Explain the law of conservation of mass in a closed system. Explain the law of conservation of mass in a system. Calculate the mass of product formed from a given mass of reactant, using a balanced equation. Calculate the mass of a reactant needed to produce a given amount of product, using a balanced equation. Calculate the concentration of a solution in g dm–3. SC9c Moles H Step Learning outcome Had a look Nearly there Nailed it! H Describe what is by a mole of particles. H Calculate the number of moles of particles in a given mass of a certain substance and vice versa. H Calculate the number of particles in a given number of moles or mass of a substance and vice versa. H Explain that the mass of a product formed in a reaction is controlled by the mass of reactant that is not in excess. H Deduce the balanced equation for a reaction from the masses of reactants and/or products.