50 mL of 0.060 M K₂CrO₄ is mixed with 50 mL of 0.080 M AgNO₃. Calculate the following:

a. The solubility of Ag₂CrO₄ (K_sp = 1.9 X 10^-12) in the solution in moles per liter.

b. The concentrations of the following ions Ag⁺, CrO₄^-2, K⁺, and NO₃^-.

The mass of an iron bolt was 5.4 greater when it was manufactured. After being bolted to an outdoor structure for several months, the mass of the bolt was found to hae increased by 0.2 grams. Given the following balanced equation for the reaction, does the example support the law of conservation of mass? Why or why not?

4Fe +3O2--> 2Fe2O3

Draw the structure of four benzoic acid molecules and as many water molecules as you need to illustrate how the solid state of benzoic acid might look in cold water prior to recrystallization. In a second drawing illustrate what happens if the water is heated to near 100C, where benzoic acid is soluble. In each drawing identify, by name, specific examples of types of intermolecular interactions involved. Based on your drawings explain why benzoic acid is soluble in hot water and not soluble in cold water. Answer the question at the molecular level discussing the specific interactions involved in your drawings.

Find the volume (mL) and the pH of 0.135 M HCl needed to reach the equivalence point(s) in titrations of the following. (You need to find the pH at the equivalence point, not the initial pH of the solution.

(a) 50.8 mL of 0.272 M NH3

(b) 11.8 mL of 1.76 M CH3NH2

(1) What volume of 1-butanol is needed to convert 1.00 gram of benzhydrol to n-butyl benzydryl ether?

(2) Write the mechanism for the acid catalyzed condensation of ethyl alcohol to give diethyl ether. Note: make sure your mechanism has the following three steps (a) protonation (b) SN2 (not SN1) and finally (c) deprotonation.

CalculatethepHofthesolutionformedbyadding25.10mL0.100MHNO3to15.00mL0.150 M KOH.

No. 5

A 1.00L bulb containing 0.233 Mol N2 and 0.341 mol PCl5 is heated up to 523K. The total pressure at equilibrium is 29.33 bar. Assuming that all gases are ideal, calculate Kp for the only reaction that occurs: PCl5(g)<--->PCl3(g) +Cl2(g) (Hint: Notice that the total number of moles at equilibrium is not the same as the initial number of moles)

Draw a reaction wheel for boron.

1)For the following reaction, 4.56 grams of iron(II) chloride are mixed with excess silver nitrate. The reaction yields 5.35 grams of iron(II) nitrate. iron(II) chloride (aq) + silver nitrate (aq) iron(II) nitrate (aq) + silver chloride (s) What is the theoretical yield of iron(II) nitrate ? grams What is the percent yield of iron(II) nitrate ? %

2) For the following reaction, 6.19 grams of iron are mixed with excess oxygen gas . The reaction yields 5.24 grams of iron(II) oxide . iron ( s ) + oxygen ( g ) iron(II) oxide ( s ) What is the theoretical yield of iron(II) oxide ? grams What is the percent yield for this reaction ? %

Challenge problem:Critical mass is the smallest amount of radioactive material necessary to sustain a nuclear chain reaction. Uranium-235, the isotope of uranium used in the "little boy" bomb dropped on Hiroshima during Wordl War II,has a critical mass of 52 kg. How many long tons of yellowcake (64% uranium by mass) need to be processed to produce a critical mass of U-235? The percent natural abundance of U-235 is 0.72% and its nuclide mass is 235.0439 amu.

1 long ton = 2240 lb., 1 kg = 2.20 lb.

How can an organism generate ATP from Acetyl-CoA directly (not via electron transfer chains indirectly)? Describe the chemistry involved.

Imagine that you are in chemistry lab and need to make 1.00 LL of a solution with a pHpH of 2.60.

You have in front of you

• 100 mLmL of 6.00×10−2mol L−16.00×10−2mol L−1 HClHCl,
• 100 mLmL of 5.00×10−2mol L−15.00×10−2mol L−1 NaOHNaOH, and
• plenty of distilled water.

You start to add HClHCl to a beaker of water when someone asks you a question. When you return to your dilution, you accidentally grab the wrong cylinder and add some NaOHNaOH. Once you realize your error, you assess the situation. You have 83.0 mLmL of HClHCl and 90.0 mLmL of NaOHNaOH left in their original containers.

Assuming the final solution will be diluted to 1.00 LL , how much more HClHCl should you add to achieve the desired pH?

For each of the following molecules, draw the most preferred Lewis structure and label each of the atoms with its formal charge. Question to consider: What is/are the main criteria for drawing a preferred Lewis structure? (a) TeF5 – (b) NO2 +

Ignoring activities, determine the molar solubility of copper (I) azide (CuN3) in a solution with a pH of 3.088. Ksp (CuN3) = 4.9