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17 Cards in this Set
- Front
- Back
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deposition
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gas -> solid
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heat of transition (del H)
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amt of energy required to complete transition
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when temp doesn't change but phase change, q = ?
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n * del H
- n (mol) and H (cal/mol) or m * del H |
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1 cal = what joule
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4.2 joule
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when a substance absorbs or releases heat, either its temp changes or phase changes but never both. true or false
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true
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when temp change but phase doesn't change, q = ?
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q = m*c*del T
-m = mass in gram -c = specific heat (J/g*K) -T = kelvin -q = heat added or released (cal or joule) |
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the higher specific heat (c), the better the substance what?
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can hold on to the absorbed heat
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stronger the bond, what happen to specific heat?
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higher specific heat
ex: CH4 (nonpolar) or CO ( weak dipole force) has weaker bond than CH3OH (H bond) |
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heat of vaporization > heat of fustion (T or F )
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T (always)
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during a phase transiton, does the temperature change?
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NO! (look at the phase transition diagram)
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in phase diagram:
x and y axis are what? |
x = temp
y = pressure |
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triple point
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temp and pressure at which all 3 phases exist simulaneouly in equi
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critical point
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end of liq and gas boundary
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superficial fluid
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beyond critical point
a substance has both liq and gas ( cannot distinct) |
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water
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unlike other, more dense in liq than solid when increase pressure at constant temp
thus it has neg liquid slope in phase diagram |
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standard state
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1 atm
298 K or 25 C |
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STP
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1 atm
273 K or 0 C |
