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exothermic reactions - neutralization - combustion - transfer heat energy from the system to the surroundings - heat content decreases - enthalpy is negative - bond making enthalpy the heat content of a substance endothermic - energy transfer from the surroundings to the system. - enthalpy is positive - photosynthesis - bond breaking increase in temp. when an object is heated depends on - mass of the object (the object with the smallest number of particles will experience the larger temp. increase) - heat added - nature of the substance