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Energy - Coggle Diagram

- - - - Not enough energy to meet the activation energy
- - - - The energy change IN THE SUBSTANCES BEING REACTED
        
        Don't confuse - change in (heat) energy of surroundings
      - Negative (-)
        
        REACTANTS/PRODUCTS lose (POTENTIAL) energy
        
        (Conservation of energy - cannot be destroyed/created)
        
        SURROUNDINGS gain THERMAL energy
      - Positive (+)
        
        REACTANTS/PRODUCTS gain (POTENTIAL) energy
        
        (Conservation of energy - cannot be destroyed/created)
        
        SURROUNDINGS lose THERMAL energy
- - - - After 'upfront investment', Releases more energy FORMING BONDS than used to BREAK BONDS
        
        keep going (until all reactant used)
        
        e.g a combustion reaction (burning of ethanol)
        
        Continues - until all ethanol burned (in constant conditions)
        
        1366.8 kJ of energy is released when 1 mol of ethanol burns (reacts with 02)
        
        Mental Image: campfire
        
        Needs heat provided to light upfront
        
        continues alight until all fuel used up
    - - After 'upfront investment', Releases less energy FORMING BONDS than used to BREAK BONDS
        
        need input/'investment' of ENOUGH energy to keep going (until all reactant used)
        
        ENOUGH heat must be added for all reactants to react to form products
        
        when one mole of nitrogen reacts with one mole of O2 at constant volume 180 kj heat is absorbed
        
        Mental Image: Melting ice cubes
        
        requires INPUT of heat for the process to keep going, and the ice to turn to water