Be sure to answer all parts.

Rank the following species according to their relative stability and indicate their magnetic properties:

O₂, O₂⁺, O₂

⁻

(superoxide ion), and O₂²

⁻

(peroxide ion)

I recently performed a lab on Chemical Equilibrium.

Here is some background on the experiment:

-We made a stock solution by combining Fe(NO3)3 and NH4SCN. This made a blood red solution. Then, we added different reagents to see the change of color and the shift of equilibrium.

I'm being asked the following question: Based on the color of solutions reported, determine the direction of the reaction's: Fe^3+(aq)+SCN^- --> [FeSCN]^2+(aq) equilibrium shift upon each addition of each reagent investigated and write the chemical reaction involving the reagent that is reponsible for the shift.

We investigated the following additions:

a. 1 M iron (III) nitrate

-Upon adding iron (III) nitrate to the blood red stock solution, it turned a somewhat lighter red.

b. 1 M ammonium thiocyanate

-Upon adding this to the stock solution, it turned from blood red to a dark red/black

c. 0.1 M tin (II) chloride

-Upon adding this to the stock solution, it turned from blood red to a cloudy orange color.

Please explain how you determined the shift and equation, I don't understand how to find either.

Thank you so much for your help!

Why are we performing each of the following four steps during the work-up of the second synthesis (“Hydrogenation of a Chalcone”)? (What is the purpose of each step?) Please explain.

a) Add 15 mL of brine and 10 mL of ethyl acetate to the mixture. Shake vigorously, then separate the ethyl acetate layer from the aqueous phase. Store the ethyl acetate layer in a dry, clean Erlenmeyer flask.

b) Extract the aqueous phase again with an additional 5 mL of ethyl acetate.

c) Combine the two ethyl acetate solutions and wash this ethyl acetate layer with 5 mL of brine. Drain the aqueous phase and pour the ethyl acetate solution into a clean 25-mL Erlenmeyer flask.

d) Dry the organic phase with anhydrous magnesium sulfate for 5 min.

Aqueous hydrochloric acid and aqueous potassium permanganate react to form chlorine gas, liquid water, solid potassium chloride, and aqueous manganese chloride. If 8.88×104 milligrams of hydrochloric acid reacts with an excess of potassium permanganate, determine the mass of chlorine in grams. I really have no Idea how to approach this problem. Please help this is due at midnight tonight.

A. 1.01×106 grams

B. 7.79×103 grams

C. 2.59×108 grams

D. 5.53×105 grams

E.54.0 grams

in a lab experiment to test the change in temperature of NaCl and the change in temperature of water:

Specific heat of NaCl is 0.88
specific heat of DI water is 4.2

in the experiment, the change in temperature for the water was much greater than the change in temperature of the table salt as well as the change in energy.
(when using equation E = g C × change in T)

why did this occur?

Pre-Lab Assignment

1. A 0.1017 g sample of KBrO3 was dissolved in dilute acid and treated with an excess of KI. BrO3¯ + 9I¯ + 6H+ Br¯ + 3I3¯ + 3H2O The generated I3¯ required 27.39 mL of a Na2S2O3 solution to reduce it to I¯. Use the above equation and those found in the introduction to determine the molarity of the Na2S2O3 solution.

2. The following data was obtained for an iodometric titration of an ascorbic acid tablet.

Mass of tablet: 1.2381 g

Mass of sample analyzed: 0.2483 g

Vol. of 0.0166 mol•L-1 KIO3: 25.00 mL

Vol. of 0.0198 mol•L-1 Na2S2O3 to reach endpoint: 11.01 mL

Using the equations found in the introduction, determine: the mass of ascorbic acid in the sample analyzed and the mass of ascorbic acid contained within the tablet.

explain why all glassware must be dry and the solvent anhydrous during formation and reaction of a grignard reaction. Further, explain whether acetone would be a viable solvnt for a generation of a grignard reagent. include one or more balanced chemical equations in your answer.

Flame-retardant fabrics often have ________ atoms incorporated into the fabric's fibers.

a) N or Cl

b) N or O

c)Cl or Cr

d)Cl or Br

My alpha radiation source is polonium-210. When new, the activity of the source is 0.1 microcurie.

1.What is the half-life?

2.Calculate the decay constant.

3.What is the activity of the new source in bequerels?

4.How many ²¹⁰Po atoms are present in the source when it

2,4-Dichlorophenoxyacetic acid ("2,4-D") is a widely used herbicide with the molecular formula C8H6Cl2O3. The pKa of 2,4-D is 2.73. A certain water-based herbicide product contains 110 gL−1 of 2,4-D. What is the pH of the 2,4-D solution?

A)

Calculate the mass defect of the oxygen nucleus 16  8O. The mass of neutral 16  8O is equal to 15.994914 atomic mass units.

Express your answer in atomic mass units to four significant figures.

B)

Calculate the binding energy E of the oxygen nucleus 16  8O (1eV=1.602×10−19J).

Express your answer in millions of electron volts to four significant figures.

C)

Calculate the binding energy per nucleon of the oxygen nucleus 16  8O.

Express your answer in millions of electron volts to four significant figures.

D)

Calculate the mass defect of the helium nucleus 52He. The mass of neutral 52He is given by MHe=5.012225amu.

Express your answer in atomic mass units to four significant figures.

E)

Calculate the binding energy E of the helium nucleus 52He (1eV=1.602×10−19J).

Express your answer in millions of electron volts to four significant figures.

F)

Calculate the binding energy per nucleon of the helium nucleus 52He.

Express your answer in millions of electron volts to four significant figures.

1. Glycogen:

a.)  Is mainly broken down to glucose-1-P by glycogen synthase

b.)  Has branch chains that are attached at the branch points by alpha 1,4

glycosidic linkages

c.)  Built by glycogen phosphorylase when there is high ATP and high glucose-6-

P

d.)  Is an important storage form of glucose in our livers

e.)  Both a and c 

2. What effect will high fructose-2,6-bisphosphate and low ATP have on gluconeogenesis?

a.)  It will shut gluconeogenesis down at the step of triose phosphate isomerase

b.)  It will speed gluconeogenesis up at fructose-1,6-bisphosphate phosphatase

c.)  It will speed up gluconeogenesis by hyperactivating triose phosphate

isomerase

d.)  It will speed up gluconeogenesis by hyperactivating phosphofructokinase

e.)  Both b and d

1. The solubility product, K_sp, for aluminum hydroxide, Al(OH)₃, is 1.9 ✕ 10⁻³³ at 25°C. What is the molar solubility of aluminum hydroxide in a solution containing 0.066 M KOHat 25°C?