HSC Sciences – improving performance in extended responses - By: Amit Kothiyal

Like it or hate it, the way HSC science subjects (e.g. Physics, Chemistry, Biology) are implemented in our HSC requires students not only to have quantitative skills for calculation-type questions, but also be skilled in forming cohesive arguments to support a conclusion – much like essays in English, but about scientific issues. Many students don’t have as much trouble with the quantitative aspects of HSC sciences, but have issues consolidating the qualitative aspects of their courses for essay-type responses.

Summarise essay dot-points that have extended response requirements

It is a good idea to know which parts of the syllabus correspond to essay-type exam responses. As you learn the course, always cross reference the content you cover with the syllabus. Become strongly familiar with the syllabus dot-points for each module. You will notice that most subsections in each module (i.e. the numbered sub-parts in each module) will have one or two dot-points that require ‘discuss’ or ‘assess’ or ‘evaluate’ – words which require students to be able to synthesise content and form coherent arguments.

Familiarise yourself with these dot-points. Revise related content, or ask your teacher / tutor about the relevant issues for each, then make a short summary sheet (probably half a page for each) in dot-point form to lay out everything that’s relevant.

Here’s a couple of examples of how you might roughly summarise the essay requirements for a sample module.

HSC Chemistry

The Acidic Environment

1. Summarise the industrial sources of SO2 and NOx and evaluate the reasons for concern about their release into the environment. For example: SO2 is from coal burning and car exhaust, and causes acid rain. NOx is from automobile exhaust mainly, (older cars, or malfunctioning catalytic converters) and causes photochemical smog, acid rain etc.

2. Trace the developments in understanding of acid / base reactions. E.g. understand the main developments in our definitions of acids / bases, outline the concept of conjugates, discuss the validity of current definition of acids / bases compared to past definitions.

3. Assess the use of neutralisation as a safety measure / to fix acid spills. E.g. outline what buffers are and how weak bases can be useful in neutralising acids. Understand why a weak base instead of a strong base is used. Explain neutralisation and buffer systems in terms of Le Chatelier’s principle.

HSC Physics

Space

1. Contribution of Tsiolkovsky, Obert, Goddard, Esnault-Pelterie, O’Neill, or von Braun to the development of space exploration (i.e. modern rocketry). E.g. Robert H. Goddard, considered as ‘father of modern rocketry’ developed the world’s first liquid-fuel rocket, pioneered research into multi-stage rockets (allowed astronauts to reach the moon), research into gyroscopic stabilisation, and steerable thrusters, allowing greater, safer control of rockets.

2. Discuss issues with safe reentry into Earth’s atmosphere. E.g. backward-facing astronauts (eyeball-in effect is less stressful than eyeball-out), radio blackout prevents communication to ground base during most of re-entry. Optimum angle of re-entry ensures probe does not skip off atmosphere, or undergo excessive deceleration and heating. Heat shields carry away heat. Parachutes are required for final deceleration, or in the case of a shuttle, gliding like a plane.

3. Describe, evaluate and interpret the MM experiment’s results. E.g. the MM experiment produced a null result for the existence of the aether. This result alone does not disprove the aether’s existence, but it does not contradict Einstein’s Theory of Special Relativity. The latter was developed further and was successful in predicting real-world phenomena, such as time dilation / length contraction observed between inertial frames with relative motion.

4. Discuss the relationship between theory and evidence supporting it, using Einstein’s predictions. E.g. Einstein’s thought experiments were merely conjectures supported by logical deduction – at the time, there was no experimental way to verify Einstein’s predictions. In modern times, with the advent of atomic clocks and space flight, we are able to experimentally verify Einstein’s predictions as correct. The relationship is theory of the unknown comes from deduction of what is known, and experimental verification follows. If real-world results differ, the theory must be modified or superseded. This is the scientific method.

Do this for the entire syllabus, by first identifying which syllabus dot-points require an extended response in order to be tested in an exam. These dot-points are guaranteed to come up in your exams, either in your first assessment, half yearly, HSC trials, or the external HSC exams. Don’t leave this till last minute – familiarise yourself as you go through the course, then revise and re-familiarise. Be sure to include all of the relevant issues, some of which are latent and require deeper analysis. E.g. is Ethanol truly greenhouse neutral? You can argue yes or no, depending on what evidence you include in your response.

Finally, don’t be afraid of those 6 mark or 7 mark discuss / evaluate / assess exam questions. As long as you’re familiar with most of the relevant issues that particular question entails, you will be fine. Good luck!

About the Author

Dux College is a Sydney-based HSC coaching center specializing in HSC subjects including HSC Physics, HSC Chemistry Tutoring, Maths tutoring. Dux College’s HSC tuition programs are intensive and results driven, aimed at giving our students the skills to achieve Band 6, and their highest potential UAI.

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