SOUND: ONLINE IGCSE PHYSICS CLASS In this chapter, we will be  Discovering properties of sound waves We will be investigating the waveform of sound waves, amplitude and frequency We will be talking about echoes Review some questions A sound is a form of a wave. Sound waves are a.

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OXIDATION AND REDUCTION: ONLINE IGCSE CHEMISTRY CLASS Let’s learn to understand the difference between oxidation and reduction. Oxidation Reduction Oxidising agent Reducing agent We conclude that A reducing agent is oxidized and an oxidizing agent is reduced.