0 Kelvin - Known as 'absolute zero', 298 Kelvin is equal to - 25 oC, -273 oC is equal to - 0 Kelvin, Exothermic reactions - Have a negative enthalpy change, Endothermic reactions - Absorb energy from the surroundings, Internal energy - The sum of the kinetic and internal energy in a system, Temperature is - A measure of the kinetic energy in a system, Enthalpy - The total heat content of a system, Entropy - A measure of disorder in a system, Gas - The state of matter with the most internal energy, Solid - The state of matter with the least entropy, Delta ⩟ - We use this to denote 'change', Available/useful energy in a system is known as - Enthalpy, Unavailable/useless energy in a system is known as - Entropy, A feasible reaction is also known as - Spontaneous , Units for enthalpy - KJ Mol-1, Units for entropy - J K-1 Mol-1, Gibbs free energy - The available/useful energy a system has, Delta ⩟G - The change in Gibbs free energy,

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