To obtain a resolution of 1.50, how many theoretical plates must
a packed column have for...
To obtain a resolution of 1.50, how many theoretical plates must
a packed column have for two peaks which elute at 5.42 and 5.63
minutes, where tm = 1.00 min? With a resolution of 1.50, are these
peaks considered to be resolved?
An HPLC column received from a manufacturer was specified to
have 4000 plates measured under standard conditions with a test
compound. When the customer repeated the test she found only 1500
plates, despite a symmetrical Gaussian peak shape. What might
account for this?
a. How
many people must be surveyed to obtain the percent of the
population that has health insurance to within 4% with
90% confidence? b. How
many subjects must be sampled to estimate the mean annual expense
of a family on cell phones to within $4 with
99% confidence. Assume the population standard deviation is $9.
[7] How many MB of video memory is required to display an
image with a resolution of 1,920 x 1,080 pixels and 65,536 colors
(2^16colors)? However, 1 [MB] = 1,000 [kB] and 1 [kB] = 1,000
(B).
[8] What is the amount of video memory required to display an
image with a resolution of 1,600 x 1,200 pixels and 65,536 colors
(2^16 colors)? However, 1 [MB]= 1,000 [kB], 1 (kB] = 1,000
(B).
[9] Minimum required for video distribution at...
5. How many recessive alleles for a trait must an organism
inherit in order to have that trait?
6. Gregor Mendel crossed true-breeding purple-flowered plants
with true-breeding white-flowered plants. Explain why all the
offspring were purple.
7. Name and explain the categories of gene mutations.
8. What is the role of tRNA in translation?
9. Explain the makeup of the DNA molecule.
10. Define codon.
11. What do the filled-in squares of a Punnett square
represent?
1. How many grams of solid sodium
nitrite should be added to 1.50 L
of a 0.106 M nitrous acid
solution to prepare a buffer with a pH of
4.058?
grams sodium nitrite = _____
g.
2. How many grams of solid sodium
cyanide should be added to 1.00 L
of a 0.196 M hydrocyanic acid
solution to prepare a buffer with a pH of
10.140?
grams sodium cyanide =
_____g.
1) How many grams of solid ammonium
chloride should be added to 1.50
L of a 0.273 M ammonia solution
to prepare a buffer with a pH of 8.540 ?
2) How many grams of solid sodium
hypochlorite should be added to
1.00 L of a 0.239 M
hypochlorous acid solution to prepare a buffer
with a pH of 8.109 ?