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Topic 4: Managing Resources

7 dot points, in syllabus order. Each dot point has a focused answer, with exam-style questions and worked answers where available.

How is the energy content of a fuel measured and compared?

Define and calculate the enthalpy of combustion of fuels, and compare fuels by their energy content per gram and per mole.

Defining and calculating enthalpy of combustion, comparing fuels by energy per gram and per mole, complete versus incomplete combustion, biofuels, and fully worked SACE-style combustion-calorimetry calculations.

9 min read →

How does electrical energy drive non-spontaneous redox reactions in electrolysis?

Describe electrolytic cells, predict electrode products, and apply Faraday's relationships to calculate amounts in electrolysis.

How electrolytic cells use electrical energy to drive non-spontaneous redox reactions, predicting electrode products, and applying the charge and Faraday relationships, with fully worked SACE-style electrolysis calculations.

10 min read →

How do primary and secondary cells store and supply electrical energy?

Distinguish primary and secondary cells, describe their electrode reactions, and evaluate them as energy resources.

The difference between primary and secondary (rechargeable) cells, their electrode half-equations, the lead-acid and lithium-ion examples, and worked SACE-style charge-capacity and electrode calculations, with a sustainability evaluation.

9 min read →

How are metals extracted from ores and protected from corrosion?

Describe methods of metal extraction and explain corrosion (rusting) of iron and methods used to prevent it.

Extraction methods linked to reactivity (carbon reduction, electrolysis), the electrochemical mechanism of rusting, and corrosion-prevention methods including sacrificial protection, with worked SACE-style stoichiometry and half-equation examples.

9 min read →

How does a galvanic cell convert a redox reaction into electrical energy?

Describe the operation of galvanic cells and use standard electrode potentials to calculate cell potential and predict spontaneity.

The structure and operation of galvanic cells, the role of the salt bridge, using standard electrode potentials to calculate cell EMF and predict spontaneity, and worked SACE-style cell-potential calculations.

9 min read →

How can the full environmental impact of a product or process be assessed?

Use life cycle analysis to evaluate the sustainability and environmental impact of materials, products and chemical processes.

The stages of a life cycle analysis (raw materials, manufacture, use, disposal), how to evaluate and compare products for sustainability, the value of recycling, and worked SACE-style quantitative impact comparisons.

8 min read →

How are oxidation and reduction tracked using oxidation numbers and half-equations?

Assign oxidation numbers, identify oxidation and reduction, and balance redox equations using half-equations.

The oxidation-number rules, identifying oxidation, reduction, oxidising and reducing agents, and balancing redox equations from half-equations in acidic solution, with fully worked SACE-style examples.

9 min read →