Chemistry Assessment 34% SAC 33%Exam 1 33% Exam 2 3 SACs per Semester Extended investigation (50 marks) Written report (25 marks) Response to stimulus material, Q and A. (25 marks)

Extended investigation Contents in fertilizer Sulfur, nitrogen and iron contents through gravimetric analysis, back titration and redox titration. Written report- esters Response to stimulus material test - DNA

Analytical Chemistry Must Must Must Review this chapter in detail at home as we don’t have enough time in class!

Analytical Technique Depends on: Nature of sample Nature of chemical Concentration of that chemical Accuracy required Time available Cost benefits

Week 1 Unit 3 Chemistry Key Knowledge Chemical analysis in action, some case studies Qualitative and quantitative analysis 1, 5, 8 Analytical techniques utilise chemical and physical properties of substances Overview of analytical techniques 2 Measuring water content 5 Review the mole concept general gas equation, molar volume 6, 7, 9, 19, 20, 23 Review determination of empirical and molecular formula 10, 12, 13, 24, 34, 47 Calculations involving mass of reactants and products 15, 16, 26, 28 Using gravimetric analysis to find the composition of a mixture 17, 44, 46, 48

Measuring Water Content Percentage of water in a sample can be determined by heating the sample at 110 degrees until there is no change in mass. “Heating to constant mass” What formula do we use to determine %mass?

THE MOLE You need to Know what Each of these Letters represent

More Revision Molar Volume of a gas-dependant on pressure and temperature At “standard temperature and pressure” (STP 0˚C and 1atm) the molar V is 22.4L /mol At “standard laboratory conditions” SLC 25˚C and 1 atm 24.5L/mol

And more Revision Empirical formulas “Percentage to Mass, Mass to Moles divide by smallest multiply til whole” Molecular Formulas