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HSC Chemistry

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3 | Chemical monitoring and management

4: Human activity has caused changes in the composition and the structure of the atmosphere. Chemists monitor these changes so that further damage can be limited.

Lesson 1 | Layered structure of atmosphere and main pollutants

  • Describe the composition and layered structure of the atmosphere

  • Identify the main pollutants found in the lower atmosphere and their sources

Lesson 2 | Coordinate covalent bond and structure of ozone and oxygen relate to properties

  • Describe the formation of a coordinate covalent bond

  • Demonstrate the formation of coordinate covalent bonds using Lewis electron dot structures

  • Compare the properties of the oxygen allotropes O2 and O3 and account for them on the basis of molecular structure and bonding

  • Compare the properties of the gaseous forms of oxygen and the oxygen free radical

Lesson 3 | Ozone in troposphere and stratosphere

  • Describe ozone as a molecule able to act both as an upper atmosphere UV radiation shield and a lower atmosphere pollutant

  • Analyse the information available that indicates changes in atmospheric ozone concentrations, describe the changes observed and explain how this information was obtained

Lesson 4 | CFCs and halons

  • Identify the origins of chlorofluorocarbons (CFCs) and halons in the atmosphere

  • Discuss the problems associated with the use of CFCs and assess the effectiveness of steps taken to alleviate these problems

  • Present information from secondary sources to write the equations to show the reactions involving CFCs and ozone to demonstrate the removal of ozone from the atmosphere

  • Present information from secondary sources to identify alternative chemicals used to replace CFCs and evaluate the effectiveness of their use as a replacement for CFCs

Lesson 5 | CFCs nomenclature and isomers

  • Identify and name examples of isomers (excluding geometrical and optical) of haloalkanes up to eight carbon atoms

  • Gather, process and present information from secondary sources including simulations, molecular model kits or pictorial representations to model isomers of haloalkanes

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  • HSCStudy Lab Lessons

    60 Lessons

    Lessons by expert teachers that cover the NSW HSC Chemistry Syllabus comprehensively.

  • HSCStudy Lab Quizzes

    59 Practice questions

    59 lesson quizzes that include a variety of questions. This course also includes 15 focus level and 3 module level tests, as well as a comprehensive end of course practice exam.

  • HSCStudy Lab videos

    51 Hours of video

    Videos that fully explain complex chemistry questions through animation, practical experiments, and tutorials.

  • HSCStudy Lab interactives

    17 Interactive activities

    Interactive activities that help you explore and understand key syllabus dot point as well as additional resources such as an interactive Periodic Table.

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