CHM135H1 Study Guide - Final Guide: Magnesium Hydroxide, Pipette, Dont
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CHM135H1 Full Course Notes
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5. 1 the enthalpy change of a reaction can be calculated from their effect on the temperature of their surroundings. 5. 2 first law of thermodynamics: energy cannot be created nor destroyed. 5. 3 energy is absorbed (endothermic) when bonds are broken and released (exothermic) when bonds are formed. 15. 1 the concept of energy change in a single step being equivalent to the summation of smaller steps can be applied to changes involving ionic compounds (hess" law) 15. 2 second law of thermodynamics: a reaction is spontaneous if the overall transformation leads to an increase of total entropy (system + surroundings). The direction of spontaneous change always increases the total entropy of the universe, at the expense energy available to do useful work. Energy: a measure of the ability to do work, that is to move an object against an opposing force. Heat: a measure of the total energy (in j) and is dependent on the mass of substance present.
