Chapter_15 - Test bank

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Chapter 15 Thermal Properties of Matter
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a z X An atom is described by an atomic mass a and an atomic number z a determines the mass of the atom ( in u) 1 u = the mass of one proton or neutron= g 24 10 66 . 1 The mass of 1 mole of the substance X = a (g) 1 mole of the substance X = A N atoms of X mole atoms N A 23 6.02 number s Avogadro' 1- Avogadro’s number and mole
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number s Avogadro' atoms of number Total A N N n s mass molar atom m The number of moles n : The mass of an atom:
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2- Equations of State • Experimental observations: T is constant: P inversely proportional to V P is constant: V directly proportional to T V is constant: P directly proportional to T Establishment of an empirical law for ideal gas
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Macroscopic description of an ideal gas • Equation of state: nRT PV Kelvin in e Temperatur T mol.K J 8.31 constant gas universal R moles of number mass molar sample of mass n m Volume V Pa Pressure 3 P
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Boltzmann constant number s Avogadro' atoms of number Total A N N n RT N N nRT PV A T Nk B K J k N B 23 A 10 38 . 1 N R constant s Boltzman' molecules of Total
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Concept test What happens to the size of vapor bubbles in a pot of boiling water as they move up towards the surface of the water (T=cst): 1. It decreases 2. It remains the same 3. It increases 3. Considering that the temperature is the same every where in the pot, the size of the bubbles increase because as the bubble moves up the pressure of the fluid decreases: V P nRT V
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PT plots PV diagram • It proves especially useful to plot pressure and volume at constant temperature for a range of temperatures. In this way we can generate a 3-D surface of isothermal lines and make predictions of an ideal gas’s behavior.
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Chapter_15 - Test bank

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