3.1.2.5 0.6 Write balanced equations Students learn the formulae and Precipitation, acid-base and Balanced equations. weeks for reactions studied. charges of common ions and use thermal decomposition reactions as them to write formulae of examples of writing formulae and Formulae and equations. Balance equations for compounds and balanced balancing equations. unfamiliar reactions when equations. reactants and products are specified. Students use their observations from simple test-tube reactions to identify the products and write balanced equations. 3.1.2.2 0.2 Carry out calculations: Students practice carrying out using the Avogadro The mole and the weeks appropriate calculations. constant Avogadro constant. Practical activity: the number of using mass of The Avogadro constant molecules in a mouthful of water. substance, Mr, and as the number of amount in particles in a mole. moles(concentrations and gas volume The mole as applied to calculations are covered later) electrons, atoms, molecules, ions, formulas and equations. 3.1.2.4 0.6 Calculate empirical formula Students carry out appropriate June 2010 Unit 1 Empirical and molecular weeks from data giving calculations. Q4a formula. composition by mass or percentage by mass. Practical activity: Empirical formula June 2009 Unit 1 Definition of empirical of magnesium Q2c formula and molecular Calculate molecular formula, and the formula from the empirical
3.1.2.5 Balanced equations. Formulae and equations. 0.6 weeks Write balanced equations for reactions studied. Balance equations for unfamiliar reactions when reactants and products are specified. Students learn the formulae and charges of common ions and use them to write formulae of compounds and balanced equations. Students use their observations from simple test-tube reactions to identify the products and write balanced equations. Precipitation, acid-base and thermal decomposition reactions as examples of writing formulae and balancing equations. 3.1.2.2 The mole and the Avogadro constant. The Avogadro constant as the number of particles in a mole. The mole as applied to electrons, atoms, molecules, ions, formulas and equations. 0.2 weeks Carry out calculations: using the Avogadro constant using mass of substance, Mr, and amount in moles(concentrations and gas volume calculations are covered later) Students practice carrying out appropriate calculations. Practical activity: the number of molecules in a mouthful of water. 3.1.2.4 Empirical and molecular formula. Definition of empirical formula and molecular formula, and the 0.6 weeks Calculate empirical formula from data giving composition by mass or percentage by mass. Calculate molecular formula from the empirical Students carry out appropriate calculations. Practical activity: Empirical formula of magnesium June 2010 Unit 1 Q4a June 2009 Unit 1 Q2c
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