1. What is the molar concentration of sucrose in a can of Red Bull (27 g sucrose/250 mL)?
2. How much glycine is needed to make 125 mL of a 1.5 M stock solution?
3. What volume of ethylene glycol is needed to prepare 200 mL of a 0.25 M stock solution?
4. Using the above stock solutions from questions #2 and #3, how would you prepare 750 mL of a solution that is 10 mM in glycine and 25 mM in ethylene glycol?
5. You are given a stock solution of 50 mM of alkaline phosphatase. What volume of this solution would you need to add to what volume of distilled water to make 25 mL of a 5 mM solution?
6. You are given a 50X stock solution of DNA gel running buffer and asked to make 25 mL of the corresponding 1X solution. What volumes of the stock solution and water do you need?
7. You are given a 0.5 M solution of sodium citrate. How would you make 3 mL of a 20-fold dilution?
8. Consider an assay that involves a serial dilution as listed below. What is the total dilution factor for this assay?
--0.5 mL of trypsin is pipetted into 1.0 mL of buffer.
--0.035 mL of this sample is then pipetted into 1.0 mL of the assay
solution.
9. You are given 1.0 mL of the enzyme amylase and add cold 95%
ethanol to reach a final concentration of 25% ethanol. What volume
of the 95% ethanol did you need to add to the enzyme solution to
obtain this concentration?
(*note: this one is a little tricky—you will need to account for
the starting volume of the enzyme solution.)
10. Do the following conversions. (Show all work)
a. 0.5 mg/mL to μg/uL
b. 0.2g to ug
c. 0.4 μM to mmol/mL
In: Chemistry
About 27% of US citizens say football is their favorite sport to watch on TV. A random sample of 100 US citizens is obtained. Is the sampling distribution of the sample proportion normally distributed? Why?
In: Statistics and Probability
27. What are the techniques used in project scheduling?
28. What is coding? What are the different types of codes used in data entry? Provide examples for each
In: Computer Science
Calculate the theoretical yield if 46g of salicylic acid is reacted with 27 g of acetic anhydride.
In: Chemistry
In: Physics
27. Explain the reaction that had to occur to detect the free indole (substrate, enzyme, and products)
In: Biology
(1 point) Bacteria grow at a rate of 27% per hour in a petri dish. If there are initially 100 bacteria and a carrying capacity of 500000 cells, how long does it take to reach 94000 cells?
t = _____ hours
In: Math
Sulfur is a required nutrient because…
Question 27 options:
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In: Biology
Evaluate the integral. (Use C for the constant of integration.)
√(-x^2-6x+27)
In: Math
1a. A mixture of hydrogen and xenon gases, in a 8.27 L flask at 27 °C, contains 0.932 grams of hydrogen and 22.2 grams of xenon. The partial pressure of xenon in the flask is atm and the total pressure in the flask is atm.
1b. A mixture of argon and methane gases is maintained in a 9.12 L flask at a pressure of 2.42 atm and a temperature of 10 °C. If the gas mixture contains 13.4 grams of argon, the number of grams of methane in the mixture is g.
1c.
A mixture of hydrogen and xenon gases, at a total pressure of 950 mm Hg, contains 0.621 grams of hydrogen and 14.8 grams of xenon. What is the partial pressure of each gas in the mixture?
PH2 = mm
Hg
PXe = mm Hg
1d. A mixture of argon and
methane gases contains argon at a
partial pressure of 280 mm Hg and
methane at a partial pressure of
510mm Hg. What is the mole fraction of each gas in
the mixture?
XAr =
XCH4 =
In: Chemistry