7 2.1.3 (b) use of the Carbonate rocks! Complete 'Carbonate rocks' practical activity. This activity will also support the practical specification statements 1.1.1(a), 1.1.2(a), (i) empirical formula (the simplest This is a similar experiment to the provided 1.1.2(c), 1.1.3(a), 1.1.4(a), 1.2.1(a), 1.2.1(d), 1.2.1(e), 1.2.1(f), number ratio of atoms of OCR magnesium sulfate activity but with a 1.2.1(h), 1.2.1(i), 1.2.2(a). each element present in a different way of interpreting group results compound) graphically. The experiment is essentially the well-established practical for (ii) molecular formula (the number determination of the empirical formula of and type of atoms of each magnesium oxide. element in a molecule) 2.1.3 (c) calculations of empirical and molecular formulae, from Activity: composition by mass or percentage compositions by mass and relative molecular mass 8 2.1.3 (d) the anhydrous, Determination of the formula of hydrated * Have learners read the relevant pages in the textbook and write and down descriptions of the key terms. hydrated water of magnesium sulfate crystallisation and calculation of Experiment on the determination of the * Discuss practical procedures for determining water of crystallisation, the formula of a hydrated salt formula of hydrated magnesium sulfate. including assumptions inherent in the procedure (that all the water will from given percentage have been lost and that no further decomposition has taken place). composition, mass composition or Read through the procedure for the practical activity of ‘Determination based on experimental results the fomula of hydrated magnesium sulfate’. 1.1.1 (c) evaluation that an * Set relevant questions in the textbook. experimental method is appropriate to meet the expected outcomes 1.1.4 (c) the limitations in experimental procedures
7 2.1.3 (b) use of the (i) empirical formula (the simplest number ratio of atoms of each element present in a compound) (ii) molecular formula (the number and type of atoms of each element in a molecule) 2.1.3 (c) calculations of empirical and molecular formulae, from composition by mass or percentage compositions by mass and relative molecular mass Carbonate rocks! This is a similar experiment to the provided OCR magnesium sulfate activity but with a different way of interpreting group results graphically. The experiment is essentially the well-established practical for determination of the empirical formula of magnesium oxide. Activity: Complete 'Carbonate rocks' practical activity. This activity will also support the practical specification statements 1.1.1(a), 1.1.2(a), 1.1.2(c), 1.1.3(a), 1.1.4(a), 1.2.1(a), 1.2.1(d), 1.2.1(e), 1.2.1(f), 1.2.1(h), 1.2.1(i), 1.2.2(a). 8 2.1.3 (d) the anhydrous, hydrated and water of crystallisation and calculation of the formula of a hydrated salt from given percentage composition, mass composition or based on experimental results 1.1.1 (c) evaluation that an experimental method is appropriate to meet the expected outcomes 1.1.4 (c) the limitations in experimental procedures Determination of the formula of hydrated magnesium sulfate Experiment on the determination of the formula of hydrated magnesium sulfate. * Have learners read the relevant pages in the textbook and write down descriptions of the key terms. * Discuss practical procedures for determining water of crystallisation, including assumptions inherent in the procedure (that all the water will have been lost and that no further decomposition has taken place). Read through the procedure for the practical activity ‘Determination of the fomula of hydrated magnesium sulfate’. * Set relevant questions in the textbook.