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Exothermic reactions release heat (surroundings get warmer), while endothermic reactions absorb heat (surroundings get colder). 5. Organic Chemistry This topic focuses on carbon compounds. Focus on: Alkanes: Saturated hydrocarbons ( CnH2n+2cap C sub n cap H sub 2 n plus 2 end-sub Alkenes: Unsaturated hydrocarbons with a double bond ( CnH2ncap C sub n cap H sub 2 n end-sub
This is a high-yield topic. You must distinguish between the three main types of bonds: gcse chemistry revision notes pdf
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