Week 4 Flashcards
There is ~10% mass difference between _____ (mass 18) and _____ (mass 20)
1H2 16O
1H2 18O
The lighter molecule (____) has a higher vibrational frequency, hence slightly weaker bond strength than the heavier molecule ___ -> so _____ is slightly more reactive (and more easily vaporized)
1H2 16O
1H2 18O
1H2 16O
The greater the mass difference, the ____ the fractionation
bigger
Equilibrium fractionation factor alpha equation
(a-1)*1000 = dproducts - dreactants
an alpha value less than one means the reactions goes from ___ to ____
reactants
products
IDK COME BACK AND CHECK
Bond strength differences results in heavier molecules _____
Example __C reacts slower than __C
reacting more slowly
13
12
d18O of rain falling in Los Angeles (34°N) is _______ that falling in Alaska (55°N).
This is because the vapor pressure of H218O is slightly ____________ that of H216O
higher than
lower than
What is Henry’s Law equation?
[X (aq)] = KH * [X(g)]
KH = Henry’s law constant
Higher molecular weight gases dissolve more in seawater than do lower molecular weight gases. True or false?
true
As you heat up the sea surface, what happens to the solubility of a gas in the water?
it goes down
As wind speed increases, what happens to the stagnant boundary layer on the sea surface?
it gets thinner
Calculate d18O of water liquid (d18Oliq) in the Pacific, that is in equilibrium with water vapor, assuming that d18Ovap of the vapor above the sea surface = -15.0 ‰. The equilibrium fractionation factor for this reaction, alpha, is 1.0120. What is the equation showing this reaction?
d18Ovap –> d18Oliq d18Oliq= -3.0‰
d18Oliq –> d18Ovap
d18Ovap –> d18Oliq d18Oliq= -3.0‰
At what latitude does surface ocean water with a d18O of -40‰ originate?
80°N or °S
d18O of rain falling in Los Angeles, USA is _______ that falling in Beijing, China.
higher than
