Chemistry exam review unit 3 energy change and rates of reaction

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Grade 12 Chem Flashcards on Chemistry exam review unit 3 energy change and rates of reaction , created by sadies-geniole on 01/21/2014.

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Question Answer
Calorimety Technological process of measuring energy change in chemical system
Chemical change A change in chemical bonds between atoms resulting into a new substance
Chemical system A set of reactants and products under study, represented by a chemical equation
Endothermic Absorbing thermal energy as heat flows into the system
Enthalpy change The difference in enthral pies of reactants and products during a change
Exothermic Releasing thermal energy as heat flow out of the system
Heat Amount of energy transferred between substances
Hess's law The value of the H for any reaction that can be written in steps equal to H for each step
Isolated system An ideal system in which neither matter nor energy can move in or out
Molar enthalpy The enthalpy change associated with a physical, chemical or nuclear change involving 1 mole of a substance
Molar enthalpy of reaction (change) The energy change associated with the reaction of 1 mole of a substance
Nuclear change A change in a proton or neutron in an atom, resulting in the formation of a new atom
Open system 1 in which both matter and energy can move in or out
Physical change A change in the form of a substance, in which no chemical bonds are broken
Potential energy diagram A graphical representation of the energy transferred during a physical or chemical change
Specific heat capacity Quantity of heat required to raise the temperature of a unit mass of a substance 1*C or 1K
Standard enthalpy of formation The quantity of energy associated with the formation of 1 mole of a substance from its elements in standard state
Surroundings All matter around the system that is capable of absorbing or releasing thermal energy
Temperature Average kinetic energy of the practicles in a sample of matter
Thermal energy Energy available from a substance as a result of the motion of its molecules
Thermochemistry The study of the energy changes that accompany physical or chemical changes in matter
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