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Ch. 16 vocab chem
chemistry
Term | Definition |
---|---|
thermodynamics | the study of heat changes in chemical reactions |
energy | the ability to do work or produce heat |
heat (q) | the transfer of kinetic energy from warm objects to cooler objects |
units of heat | joules, calorie, Calorie, BTUs |
calorimetry | measure of heat released or absorbed during a chemical reaction |
specific heat | J needed to raise the temp of 1 g of a substance by 1 degree celsius |
system | environment chemical reactions take place in |
Standard T and P in standard enthalpy change | T=25 P=1 atm |
enthalpy | the heat content of a system at constant pressure |
enthalpy change | heat absorbed or released during a chemical reaction |
Hess's Law | if a series of reactions are added together, the enthalpy change for the net reaction is the sum of enthalpy change of individual steps |
spontaneous chemical reaction | a reaction that proceeds on its own w/o outside intervention |
entropy (s) | the disorder of substance in a chemical reactions |