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Summary Energy change & rates of reactions simplified

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This summary will equip you with all the knowledge you need heading into your final IEB examinations. This document isn't only beneficial for grade 12 learners but for grades 10 up to 12. The summary is aligned with the IEB SAGs document, meaning there is NOTHING you can be examed on that isn't inc...

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  • July 20, 2021
  • 10
  • 2020/2021
  • Summary
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1|Energetics

, Contents
Energy changes in reactions (Exothermic and Endothermic reactions ...................... 4

Terminology: ........................................................................................................... 4

Exothermic vs endothermic: ................................................................................... 4

Exothermic .......................................................................................................... 4

Endothermic ........................................................................................................ 4

Strength of bonds: ............................................................................................... 5

Activation energy ........................................................................................................ 5

Terminology: ........................................................................................................... 5

Potential energy profile graphs: .............................................................................. 5

Rates of reactions ...................................................................................................... 6

Terminology: ........................................................................................................... 6

Calculating reaction rate: ........................................................................................ 6

Average vs instantaneous reaction rate:................................................................. 6

Average ............................................................................................................... 6

Instantaneous...................................................................................................... 6

Factors affecting reaction rate: ............................................................................... 6

Nature of substance: ........................................................................................... 6

Surface area:....................................................................................................... 6

Concentration (pressure for gasses): .................................................................. 7

Temperature:....................................................................................................... 7

Catalyst: .............................................................................................................. 7

Collision theory: ...................................................................................................... 7

Conditions for an effective collision: .................................................................... 7

Measuring reaction rate: ......................................................................................... 7

Gas volume: ........................................................................................................ 7

Turbidity: ............................................................................................................. 8


2|Energetics

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