Coaching Centre
Chapter 8: Applying Chemical Ideas Notes
HSC Chemistry Module 8: monitoring the environment, identifying cations and anions, gravimetric analysis, precipitation titrations, colorimetry, UV-visible spectrophotometry and AAS, tests for organic functional groups, mass spectrometry, infrared and NMR spectroscopy, identifying unknown compounds, and designing chemical syntheses for industry.
Sections
-
8A Why we monitor the environment Mastered
Why chemists monitor ions in water, soil and living things: heavy metals, nutrients and acid drainage, bioaccumulation and biomagnification, guideline values, ppm and ppb conversions, and Australian case studies.
-
8B Identifying cations Mastered
How to identify Ba²⁺, Ca²⁺, Mg²⁺, Pb²⁺, Ag⁺, Cu²⁺, Fe²⁺ and Fe³⁺ in solution using flame tests, precipitation reactions and complexation reactions, with net ionic equations and a flowchart that separates them in as few tests as possible.
-
8C Identifying anions Mastered
Tests for carbonate, hydroxide, sulfate, phosphate, chloride, bromide, iodide and ethanoate ions, with net ionic equations, and why the order of the tests matters when a sample holds more than one anion.
-
8D Gravimetric analysis and precipitation titrations Mastered
Quantitative analysis by mass and by precipitation titration: finding sulfate in a fertiliser by gravimetric analysis, finding chloride by the Mohr method, and the errors that affect each.
-
8E Colorimetry, UV-visible spectrophotometry and AAS Mastered
Measuring concentration from absorbed light: the Beer–Lambert law, colorimeters and UV-visible spectrophotometers, atomic absorption spectroscopy and its Australian invention, and how to make and use a calibration curve.
-
8F Testing for functional groups Mastered
Chemical tests for carbon–carbon double and triple bonds, hydroxyl groups and carboxylic acids, how to tell primary, secondary and tertiary alcohols apart, and why chemical tests are now backed up by instruments.
-
8G Mass spectrometry Mastered
How a mass spectrometer ionises, sorts and detects molecules; reading the molecular ion, base peak and fragments; and using isotope patterns for chlorine and bromine.
-
8H Infrared spectroscopy Mastered
Why covalent bonds absorb infrared radiation, how to read an IR spectrum using wavenumber ranges from the data sheet, and how to tell alcohols, carboxylic acids, carbonyl compounds and alkenes apart.
-
8I NMR spectroscopy Mastered
How nuclear magnetic resonance works, chemical shift, carbon-13 NMR for counting carbon environments, and proton NMR with chemical shift, integration and splitting (the n + 1 rule).
-
8J Identifying an unknown compound Mastered
Combining percentage composition, mass spectrometry, infrared, carbon-13 NMR and proton NMR, plus chemical tests, to work out the structure of an unknown organic compound, with a full worked example.
-
8K Planning a chemical synthesis Mastered
Designing a route to a product: choosing reagents and conditions, limiting reagents and percentage yield, why yields multiply in multi-step syntheses, and how products are purified and their purity checked.
-
8L Industrial chemistry and sustainability Mastered
How industrial processes are chosen and evaluated: rate, yield, cost, safety and environmental impact, the principles of green chemistry, a case study of the two routes to ethanol, the Haber process revisited, and bioplastics.
-
8M Applying chemical ideas review Mastered
A summary of all of Module 8 Applying Chemical Ideas, how the topics connect, key words, and a mixed HSC-style test covering ion tests, gravimetric and titration analysis, AAS and colorimetry, functional group tests, spectroscopy and chemical synthesis.