Oxidation & Reduction

• Oxidation is loss

  Reduction is gain
• What do you call reactions when something is reduced and oxidised?

  REDOX reactions
• If something is reduced, it gains. What does this mean?

  This means that electrons are "used" so they go on the reactants side. for example - $2H^+$$\ 2e^-\rightarrow\ H_2$
• If something is oxidised, it loses electrons. What does this mean?

  This means electrons are "made" so they go on the products side. For example - $Mg\ \rightarrow\ Mg^{2+}+$$\ 2e^-$