1) How many H- ions are around each
Na+ ion in NaH, which has a cubic unit cell
with H- ions on each corner and each
face?
2) An atom has a radius of 165 pm and crystallizes in the
body-centered cubic unit cell. What is the volume of the unit cell
in cm^3?
3) A substance has a triple point at a temperature of 17 ∘C and a
pressure of 3.2 atmospheres. In what states can the substance exist...
The
Goldman Equation
K+, Na+
and Cl- ions concentrations
Changing the ratio of one of the ions has
the most dramatic effect. Which is it? Why do you suppose this
is?
Hard water often contains dissolved Ca2+ and Mg2+ ions. One way
to soften water is to add phosphates. The phosphate ion forms
insoluble precipitates with calcium and magnesium ions, removing
them from solution. Suppose that a solution is 0.049 M in calcium
chloride and 0.094 M in magnesium nitrate. What mass of sodium
phosphate would have to be added to 1.4 L of this solution to
completely eliminate the hard water ions? Assume complete reaction.
Enter a numerical answer in...
Nutrients
Choose a pair of nutrients (one mineral and one vitamin) that
works together in the body and then answer the following
questions:
What is a common deficiency disorder of these nutrients? What
diet and/or lifestyle factors contribute to risk of deficiency?
What diet recommendations could you make to a patient with this
deficiency disorder?
For the vitamin you chose, suppose that it is likely to reach
toxic levels in the body from excessive supplementation and then
answer the following...
1/ Instructions: Choose one answer from each
pair of selections.
Overcast skies usually result in cooler daytime temperatures
because clouds are good REFLECTORS | ABSORBERS of sunlight.
2/
Instructions: Choose one answer from each pair of
selections.
Compared to Phoenix (30°N latitude), Minneapolis (45°N) will have
shorter days in the winter and LONGER | SHORTER days in the
summer.
3/ Match each item
with the appropriate description.
conduction[ Choose ]the transfer of heat by the mass movement
of a fluid,...
If one choose to work on a column packed with smaller particle
sizes, what might be the biggest disadvantage of using smaller
particles (in size) as packing material (stationary phase) in
column chromotography for separation of mixtures?
12. For each of the four problems below, consider the two pairs
of atoms/ions/molecules. Which pair (i or ii) would be attracted to
one another by the strongest intermolecular interaction? Justify
your answer, making sure to name the type(s) of intermolecular
interaction(s) that are involved in each case. You will receive no
credit without a proper justification.
a. (5 points) i) Two argon atoms OR ii) two xenon atoms?
b. (5 points) i) Two NH3 molecules OR ii) two PH3...