Matter, and chemical change are the themes common to all the units of Chemistry 20. An understanding of the nature of matter and an analysis of its changes is essential for understanding what is happening and for predicting what will happen. Control of change is essential for the design of technological systems. The principles of conservation of mass and energy help to predict and explain the changes that occur within a closed system.

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Matter, and chemical change are the themes common to all the units of Chemistry 20. An understanding of the nature of matter and an analysis of its changes is essential for understanding what is happening and for predicting what will happen. Control of change is essential for the design of technological systems. The principles of conservation of mass and energy help to predict and explain the changes that occur within a closed system.

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The themes of systems, energy, diversity and change are central in Chemistry 30. The components of a system, which may be a collection of substances or processes, influence each other by the transfer of energy and matter. Changes to one part result in changes to other parts of the system. In a system at equilibrium, opposing reactions are balanced.

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