Paper 2: Rate of reaction, equilibrium & Energy and change
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11 Terms
heat of reaction/enthalpy (ΔH)
the energy absorbed or released per mole in a chemical reaction
exothermic reactions
reactions that release energy
endothermic reactions
reactions that absorb energy
activation energy
the minimum energy needed for a reaction to take place
activated complex
the unstable transition state from reactants to products
rate of reaction
the change in concentration of reactants or products per unit time
catalyst
a substance that increases the rate of a chemical reaction without itself undergoing a permanent change
open system
a system that continuously interacts with its environment
isolated system
a system that is isolated from its surroundings
reversible reaction
a reaction is reversible when products can be converted back to reactants and vice versa
chemical equilibrium
a dynamic equilibrium when the rate of the forward reaction equals the rate of the reverse reaction
Note 
Flashcards (125)