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14 Cards in this Set
- Front
- Back
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What is bond energy?energy
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required to break a bond - always a positive number
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Three factors can affect the enthalpy of reaction:
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• The concentrations of the reactants and the products
• The temperature of the system • The partial pressures of the gases involved (if any) |
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What is enthalpy?
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A measure of the energy change in the system plus work done to or by the system
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Explain the first law of thermodynamics:
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energy is conserved
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What is the difference between heat and temperature?
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temperature is the average kinetic energy of the molecules of a substance
heat is energy; total energy possessed by the molecules in a piece of matter |
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What is the first law of thermodynamics?
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Esys = q + w
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Compounds for which the force of attraction between particles is strong have large values for a.
Therefore, compounds with large values of a would have __ boiling points. |
higher
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In the van der Waals equation, what does a represent and what are the units used?
(P + (an^2 / V^2))(V - nb) = nRT |
attraction between particles
(L^2 x atm/mol^2) |
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In the van der Waals equation, what does b represent and what are the units used?
(P + (an^2 / V^2))(V - nb) = nRT |
rough measurement of the size of the particle
(L/mol) |
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What is van der Waals equation?
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(P + (an^2 / V^2))(V - nb) = nRT
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When does deviation from ideal gas behavior occur?
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when the gas is at low temperatures, or high pressures
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What do Graham’s observations suggest about the relative speeds of molecules that have different molecular weights?
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light molecules travel faster than heavy molecules
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What is effusion of a gas?
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rate at which gas escapes through a pinhole into a vacuum
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What is diffusion of a gas?
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rate at which two gases mix
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