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21 Cards in this Set
- Front
- Back
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How much energy is required to increase 250mL of water to 80 degrees celcius?
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Calories=(grams of substance) * (temp in celcius).
250*80= 20000 calories |
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What is the equation for heat capacity?
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Cp= mass * specific heat
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There are four process conditions in thermodynamics, isothermal, adibatic, isochloric, isobaric, what are the conditions?
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Adibatic- no heat exchange
Isochloirc- same volume Isothermal-same heat Isobaric- same pressure |
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The internal energy of something is equal to what?
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It's absolute temperature
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Expanded gases ____
Compressed gases ____ |
Cools
Warms |
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As heat is absorbed, is q + or negative -
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+
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As the gas expands ( the system does work) is work negative or positive
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Negative
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In certain conditions, the four conditions.....isothermal....make each component become a zero number?
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E= is zero in isothermal
q= is zero in adibatic W= is zero in isocholiric |
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What is the equation in thermodynamics representing energy
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Einternal = q + Work
Work equals - pressure * (Delta)Volume Pressure = F/A |
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When you reverse a reaction, what will happen to the enthalpy?
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The enthalpy will reverse directions
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What is enthalpy?
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This is the change in heat content
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If you go from reactants to energy in products being higher, did you have an endothermic or exothermic reaction?
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Endothermic
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When forming bonds, do you have a -enthalpy or a positive
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You have a negative H becuase energy is released
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What will increase the entropy in a system?
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Increase Temp
Increase moles Increase phase to a gas |
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With just gases in a system, a increase in volume will decrease or increase entropy?
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This will increase entropy
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If given the BDE and assaigned to find the enthalpy, what would you do?
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BDE broken- BDE formed
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What i s the heat of formation
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Amount of energy to make one mole of a compound from its constiuent elements
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What is the heat of formation for a elements in their standard state
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Zero
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Where is Activation energy measured from
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The bottom of the reactnat of a graph to the amplitude
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What does not fit for Thermodynamics:
Stability Keq Speed Delta G Catalyst Elementary Step |
Speed
Catalyst Elementary Step |
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If you have a negative work, is work done by or on the system?
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Work is done by the system
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