| Term | Definition |
|---|
| the study of energy transfers as heat in chemical reactions or physical changes | What is thermochemistry? |
| give off heat, high negative enthalpy | Definition: exothermic (what type of enthalpy) |
| take in heat, high positive enthalpy | Definition: endothermic (what type of enthalpy) |
| q=mc(delta)t | What is the formula for energy? |
| Kinetic Energy | What is temperature the measure of? |
| the energy transfered between samples because of their difference in temperature | What is heat? |
| warm to cold | Which way does heat flow? |
| (delta) H= Hproducts-Hreactants or PEproducts-PEreactants | What is the formula of enthalpy? |
| chemical reactions that include the amount of energy released or absorbed | Definition: thermochemical equations |
| number of moles | Enthalpy is directly proportional to the... (3) of the substance |
| The amount of heat/energy needed to make 1 mole of a substance | What is the molar Enthalpy? |
| If the state changes, then the heat changes | Why is physical state important? |
| true | True/False: The value of enthalpy does NOT change significantly with temperature? |
| element in standar state, crystallize solid | The enthalpy of formation is zero for... (2) |
| the change in energy when one mole of a compound is formed from its elements | What is the molar enthalpy of formation? |
| large negative | Which will make the reaction more spontaneous: a large negative or a large positive enthalpy? |
| The overall change in enthalpy of the reaction is equal to the sum of the enthalpys of the individual steps | What does Hess's Law state? |
| How the reaction procedes from origional reactants to ultimate products | What is the mechanism of a reaction? |
| produced in one step and consumed in another | What are intermediates? |
| internal energy of a substance | What is enthalpy the measure of? |
| not | Spontaneous/ Not: a high positive delta h |
| spontaneous | Spontaneous/ Not: a high negative delta h |
| spontaneous | Spontaneous/ Not: a high positive entropy |
| not | Spontaneous/ Not: a high negative entropy |
| the degree of randomness of the particle in the system | What is entropy a measure of? |
| solid<liquid<aqueous<gas | High to low, entropy tends to proceed (States of matter)... |
| whether the reaction will occur in nature under the given conditions | What does spontaneity determine? |
| relates entropy and enthalpy in a given reaction system (an index to determine spontaneous reactions) | What is Gibbs Free Energy? |
| spontaneous | Spontaneous/ Not: negative delta G |
| not | Spontaneous/ Not: positive delta G |
| spontaneous | Spontaneous/ Not: - enthalpy - + entropy (if sometimes, why?) |
| not | Spontaneous/ Not: + enthalpy - - entropy (if sometimes, why?) |
| sometimes, needs a high temperature | Spontaneous/ Not: + enthalpy - + entropy (if sometimes, why?) |
| sometimes, needs a low temperature | Spontaneous/ Not: - enthalpy - - entropy (if sometimes, why?) |
| (delta) G= (delta) H - T(delta)S | What is the equation for Gibbs Free Energy? |
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