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Definition
| The study of energy and its transformations |
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| the study of the relationship between chemical reactions and energy changes |
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| capacity to do work or transfer heat |
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Energy of motion
*particles of a substance(gas, liquid, or solid) undergo motion. |
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| Energy stored by an objct as a result of its position and mass |
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| Si unit of energy is a joule(J); defiens as 2.0 kg object moving at a velocity of 1 m/s |
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Unit used for energy changes accompanying a chemical reaction
1 cal= 4.184 J |
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Definition
| is part of the unviverse being studied |
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| is everything else in unvivers other then system |
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| First law of thermodynamics |
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Definition
| the total sum of energy is its kinetic and potential energy of its component parts |
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| Total change in energy (Delta E) |
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| the system has gained energy |
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heat absorbed or released under constant pressure (H)
Cant measure H but can measure change in H |
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| If reaction is carried out in steps, Delta H for the reaction will be equal to the sum of enthalpy changes for the individual steps |
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(l)-->(g)
Delta H vaporization |
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Definition
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Definition
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| Apparatus that measures the heat flow |
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| Amount of heat required to raise a substance temperature by 1K(or 1 degree C). |
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Definition
| heat capacity of 1.0 mole of substance |
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Definition
| heat capacity of 1.0 gram of substance |
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