1. Often you may have seen results of an experiment, such as blood analysis, reported as “counts”. (a) What type of results may be represented by counts? Hint: there’s more than one type.

Assuming complete dissociation, what is the pH of a 4.21 mg/L Ba(OH)2 solution?

pH=

Calculate the solubility of LaF3 (Ksp = 2 x 10-19) in grams per liter in: a) pure water b) 0.010 M KF solution

if a titration using these solutions started with 25.00 mL of potassium chromate solution (0.5056 M), what volume of 0.2456 M lead (II) nitrate solution would be required to reach the end point? what MASS of the products would be created in that reaction?

Calculate % yield of triphenylmethanol (crude and pure)

Remember it is a two step calculations, so you should obtain the following to aid in the calculations: the mass of first reagent, mass of second reagent (including HCl – Vol & Density), and moles of both reagents (for each procedure). Then set up a Balanced Stoichiometric Equation, determine the molar ratio, determine limiting reagent and compute the theoretical yield.

These are the values:
Bromobenzene + Magnesium --> Phenylmagnesium Bromide

Phenylmagnesium Bromide + Benzophenone ---> Triphenylmethanol + Magnesium Bromide Hydroxide

0.1538g of Mg 0.9mL Bromo/Ether solution 1.0910 benzophenone + 2mL ether —-> 0.349g

   6mL of 6M HCl 2mL diethyl ether 0.301g triphenylmethanol (recrystalized and weighed 0.201 g triphenylmethanol)

What is the difference between an electrochemical cell and a voltaic cell? Is there any? If they are different how do each of their electrons flow?

How many grams of CH3OH (MW = 32.04) are in 900 g of a 1.5 m aqueous solution?

I got 43.3 g but the answer is 41.3 g. I don't know where I went wrong.

I converted 1.5 m (molality) into .0015 mol/g multiplied by 900 g and multiplied again by 32.04 g/mol.

Tempered glass is made by heating glass to a temperature to 620 ºC, then cooling it quickly by spraying the surface in a procedure known as quenching. Quenching cools the outer surfaces more quickly than the center. As the center cools, it tries to pull back from the outer surfaces, which results in tension of the center and compression of the surfaces, which gives tempered glass its strength. The specific heat capacity of glass is 0.84 J/g ºC. A 23.6 kilogram windshield at 620ºC is tempered using 54.2 kg of water at 18.6ºC. If the windshield is removed when its temperature is 75.3ºC, what is the new temperature of the water? Assume that no water evaporates. Round your answer to the nearest 10th degree. (Type "degrees" for the units.)

16. Write the balanced molecular equation, the ionic equation and the net ionic equation for the reaction that occurs when solutions of CuSO₄ and NH₄OH are mixed.

Molecular equation: (4 points)

Ionic equation: (4 points)

Net ionic equation: (3 points)

Chapter 10: Clinical Laboratory Procedures Case Study

A request for “ova and parasites” was received in the laboratory in the late afternoon. The specimen consisted of one polyvinyl alcohol (PVA) vial and one 10% formalin vial. The specimen label included the patient’s name, the doctor’s name, and the date collected. There was a note attached requesting “special attention for amoeba.” The technologist noted that the specimen vials contained material that was yellowish, opaque, and appeared chalky looking.

1. The medical laboratory scientist (MLS) checked the patient’s history and found that he had been scheduled for a lower G.I. tract x-ray series that morning. What conclusion would be drawn from this information and what action should be taken?
   1. Process the specimen as usual.

2. Reject the specimen; barium is present in the specimen.

3. Reject the specimen; identification information is incomplete.

4. Reject the specimen for reasons B and C.

2. What effect does barium have on the specimen?

1. It makes observation of parasites impossible.

2. It kills all eggs, cysts, and trophozoites.

3. It makes the specimen hazardous for workers.

2. 4. It confuses the MLS because it looks like yeast.
3. A week later, a new and properly labeled specimen arrived for parasite examination at 2 p.m.

The collection time on the unpreserved liquid specimen was 9 a.m. The comment on the order stated, “Rule out Giardiasis.” How should the MLS handle this specimen?

1. Process as usual; a proper specimen was submitted.

2. Immediately look for trophozoites in a wet mount.
3. Process as usual, noting that trophozoites might not be visible because the sample was not submitted when collected.
4. Reject the specimen because it was not preserved when collected.

4. Two days later a new, fresh, correctly labeled specimen and a PVA tube containing the patient’s feces were submitted for parasitic examination. The specimen, collected at 10 a.m., arrived in the laboratory at 10:30 a.m. Select the correct sequence used to properly process this specimen.
   1. Prepare smears for trichrome and modified acid-fast stains; concentrate and read results from 10% formalin preparation; stain and read the trichrome smears.
   2. Prepare and read the direct mount made from fresh feces; prepare trichrome smears from the PVA tube; concentrate and read results from the PVA tube.
   3. Concentrate and read results from 10% formalin preparation; prepare and read the direct mount made from fresh feces; prepare, stain, and read the trichrome smears from the PVAtube.
   4. Prepare and read the direct mount made from fresh feces; prepare smears for trichrome and modified acid-fast stains; concentrate and read results from 10% formalin preparation; stain and read the trichrome and acid-fast smears.

How do I find the % Mass of sugar in Mt.Dew if I only have the measured density of 1.04g/mL?

9. Determine the amount of product. Do not forget units.

How much lithium chloride (in grams) can be produced using 20 grams of lithium hydroxide? Answer in three significant digits. (5 points)

LiOH         +         KCl        à         LiCl        +        KOH

You are given 5mL of 3mg/mL protein solution. You are asked to prepare samples for SDS-PAGE containing 250ng, 500ng, 750ng, and 1000ng. Your pipettes are calibrated to 2uL at the lower limit. Your total volume is 20uL, with 5uL being your loading buffer. How would you prepare these samples?

TYPED RESPONSE ONLY

Choose a metal to describe in depth; do not choose a nonmetal already selected by another student. Include information on its discovery, history, abundance, physical and chemical properties, and uses or applications.