falloutgirl

If the Ksp of Ag2CO3 at 25 oC is 8.46e-12 , what is the molar solubility of Ag2CO3 at this temperature?

a) At this temperature the molar solubility of Ag2CO3 is 6.05e-34 mol/L.

b) At this temperature the molar solubility of Ag2CO3 is 1.28e-04 mol/L.

c) At this temperature the molar solubility of Ag2CO3 is 1.62e-04 mol/L.

d) At this temperature the molar solubility of Ag2CO3 is 2.91e-06 mol/L.

e) At this temperature the molar solubility of Ag2CO3 is 2.04e-04 mol/L

A solution of NaF is added dropwise to a solution that is 7.02e-02 M in Mg2+ and 2.17e-05 M in Y3+.

The Ksp of MgF2 is 5.16e-11.

The Ksp of YF3 is 8.62e-21.

Calculate the concentration of F- present in the Mg2+/Y3+ solution when the first (initial) cation begins to precipitate, and the concentration of F- present in this solution when the second (final) cation begins to precipitate. Write down which cation precipitates first and which precipitates second (last). Choose the correct statement from below based on your work.

a) The molarity of F- which begins to precipitate the initial cation is 3.62e-12 M.

b) The molarity of F- which begins to precipitate the initial cation is 7.35e-06 M.

c) The molarity of F- which begins to precipitate the final cation is 2.38e-06 M.

d) The molarity of F- which begins to precipitate the final cation is 1.23e-19 M.

e) The first metal cation to precipitate is Mg2+ .

A buffer solution contains 0.51 mol of hydrazoic acid (HN3) and 0.71 mol of sodium hydrazoate (NaN3) in 3.60 L.

The Ka of hydrazoic acid (HN3) is Ka = 1.9e-05.

(a) What is the pH of this buffer?

pH =

(b) What is the pH of the buffer after the addition of 0.36 mol of NaOH? (assume no volume change)

pH =

(c) What is the pH of the original buffer after the addition of 0.47 mol of HI? (assume no volume change)

pH =

a) means that sexual reproduction can occur in specialized structures

b) results in more genetic variation during sexual reproduction

c) allows fungi to reproduce asexually most of the time

d) results in heterokaryotic cells

e) is strong support for the claim that fungi are not truly eukaryotic

multicellular

haploid

produces spores by meiosis

produces gametes (eggs & sperm) by meiosis

the choices are: gametophyte, sporophyte, both, and neither

Double fertilization means that angiosperms

a) are the only plants that can produce dizygotic twins

b) produce twice as many embryos per fertilization event as do gymnosperms

c) have two sperm nuclei, both of which unite with nuclei of the female gametophyte

d) have two sperm nuclei, which simultaneously fertilize the single egg

e) have embryos that are triploid

What condition would have made the primitive atmosphere of Earth more conducive to the origin of life than the present one? The primitive atmosphere

a. had a layer of ozone that shielded the first fragile cells.

b. removed electrons that impeded the formation of protobionts.

c. may have been a reducing one that facilitated the formation of complex substances from simple molecules.

d. had more oxygen than the modern atmosphere, and thus it successfully sustained the first living organisms.

e. had less free energy than the modern atmosphere, and thus newly formed organisms were less likely to be destroyed.

a. internal fertilization

b. amniote egg

c. production of milk for young

d. complete embryonic development inside a uterus

The more the sequences of amino acids in homologous proteins vary, the more recently the two species have diverged.

True or False?

I picked it up last night from Barnes & Noble, but I haven't heard much about it. I loved the DaVinci Code and Angels & Demons. Is it worth the read?