Solve an equilibrium problem (using an ICE table) to calculate the pH of each of the following solutions.

a) 0.13 mol*L−1 CH3NH2

b) 0.13 mol*L−1 CH3NH3Cl

c)a mixture that is 0.13 molL−1 in CH3NH2
and 0.13 molL−1 in CH3NH3Cl

Complete the stoichiometry table using the starting values provided.

reagent molecular weight mass (g) mmoles equivalents density (g/mL) vol. (mL) bromobenzene 0.448 2.122 magnesium 1.358 benzophenone 1 diethyl ether 28.161 theoretical product triphenylmethanol melting point of triphenylmethanol (°C) Select the name of the catalyst used for this reaction, if there was no catalyst used, select none: bromobenzenemagnesiumbenzophenonediethyl ethernone

The combustion of liquid ethanol (C2H5OH) produces carbon dioxide and water. After 4.61 mL of ethanol (density=0.789g/ml) was allowed to burn in the presence of 15.70 g of oxygen gas, 3.71 mL of water (density=1.00g/ml) was collected. Determine the theoretical yield of H2O for the reaction. Determine the percent yield of H2O for the reaction.

An enzymatic reaction was analyzed for rate versus substrate concentration. Roughly estimate the Vmax and Km from these measurements. (Hint: Slope = rise/run and remember what Km represents!)

v^o(nM/s)           [S] (nM)

30                           100,000

29.5                        10,000

29                           1,000

28                           200                        

25                           150

20                           100

10                           50

5                              20

a. Vmax = 10 nM/s, Km = 20 nM

b. Vmax = 20 nM/s , Km = 50 nM

c. Vmax = 40 nM/s , Km = 150 nM

d. Vmax = 70 nM/s, Km = 250 nM

ANSWER is (c), how?

Determination of an Equilibrium Constant

1.    What is meant by a reversible reaction?

2.   True or False :       The numerical value of the equilibrium constant for                        a given reaction only changes if the temperature
                   changes.

3.   Which component of the reaction mixture was it that was titrated with
   sodium hydroxide?

   A.   Acetic acid           B.   Isopropyl alcohol

   C.   Water               D.   Phenolphthalein

4.   Why was it necessary to wrap your rubber stopper in plastic wrap?

5.   Why was it necessary to titrate a blank sample solution, that is, a sample
   of distilled water which contain only sulfuric acid?

6.   List two advantages of using a buret for measuring reaction volumes as
opposed to maybe a graduated cylinder. (Precision and accuracy are not exceptable answers)

7.   What is a catalyst and how and why was a catalyst needed in this
   experiment?

8.   When would you want to use a pipet instead of a buret in an experiment?

Chemical Engineering Question

100 mol/minute of propane gas is burned completely in a continuous reactor with air to form carbon dioxide and water. Develop an Excel spreadsheet to calculate the adiabatic flame temperature if the gasses are fed at 30oC, 1atm for the following cases:

% Excess Air = 0%, +10%, +25%, +50%, +75%, +100%, +150%, +200%

Use heat capacity data from Table B.2 for all components in the combustion reaction.Turn in a hard copy of the Excel spreadsheet as well as a plot of adiabatic flame temperature vs.% excess air.

Please post a detailed explaination:

Compare and contrast the actions of ribonuclease and restriction enzymes as to substrate choice and mechanism. Show how their strategies are similar, but also why they must use different strategies.

Please use the values in the resources listed below instead of the textbook values.

Balance the following in acidic solution. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.)

(a)

Ti + Cr₂O₇²⁻ → Ti³⁺ + Cr³⁺

Oxidation reaction

_________________

Reduction reaction

_________________

Net reaction

_________________

(b)

H₂O₂ + Mo²⁺ → H₂O + Mo⁴⁺

Oxidation reaction

_________________

Reduction reaction

_________________

Net reaction

_________________

(c)

Hg + SnO₂ → Hg₂²⁺ + Sn²⁺

Oxidation reaction

_________________

Reduction reaction

_________________

Net reaction

_________________

A 4.50 mL sample of a 0.100 M solution of an aromatic hydrocarbon dissolved in hexane is excited with a flash of light. The aromatic compound emits 19.3 J of energy at an average wavelength of 379 nm. What percentage of the aromatic compound molecules emitted a photon? Please Help, Thanks

How many grams of sodium lactate (MW = 112 g/mol) are required to prepare 200 ml solution at 1.0 M? Given pKa of lactic acid = 3.86, what is the pH of this solution?

If the Kb of a weak base is 3.8 × 10-6, what is the pH of a 0.39 M solution of this base?

You are given a sample containing a hydrocarbon and an amine - both compounds are very insoluble in water and very soluble in diethyl ether. Describe how you could efficiently separate these two compounds using extraction methods; clearly explain why your procedure should give a good separation of the components (i.e., both compounds isolated in good yield and purity).

Calculate the pH during titration of 25 mL of 0.175 M HCN with 0.3 M NaOH after the addition of 0 mL, 7.29mL, 14.5833 mL, and 20 mL base. Kb of CN- is 2.03 x 10^-5. Show all work.

1)The data below were collected for the following reaction:
CH3Cl(g)+3Cl2(g)→CCl4(g)+3HCl(g)

[CH3Cl](M)	[Cl2](M)	Initial Rate (M/s)
0.050	0.050	0.014
0.100	0.050	0.029
0.100	0.100	0.041
0.200	0.200	0.115

A

Calculate the value of the rate constant, k.

Express your answer using two significant figures.

B

What is the overall order of the reaction?

Express your answer using two significant figures.

2)

t (s)	[A] (M)	ln[A]	1/[A]
0.00	0.500	−0.693	2.00
20.0	0.389	−0.944	2.57
40.0	0.303	−1.19	3.30
60.0	0.236	−1.44	4.24
80.0	0.184	−1.69	5.43

What is the activation energy of this reaction?

Express your answer to three significant figures and include the appropriate units.

3)

The decomposition of XY is second order in XYand has a rate constant of 7.08×10⁻³ M−1⋅s−1at a certain temperature.

-

If the initial concentration of XY is 0.140 M , how long will it take for the concentration to decrease to 6.80×10⁻² M ?

Express your answer using two significant figures.

4)

The rate constant of a chemical reaction increased from 0.100 s−1 to 2.70 s−1 upon raising the temperature from 25.0 ∘C to 55.0 ∘C .

A"SOLVED"

−3.07×10−4

K−1

B

Calculate the value of ln(k1k2) where k1 and k2 correspond to the rate constants at the initial and the final temperatures as defined in part A.

Express your answer numerically

C

What is the activation energy of the reaction?

Express your answer numerically in kilojoules per mole.

5)

The rate constant (k) for a reaction was measured as a function of temperature. A plot of lnk versus 1/T(in K) is linear and has a slope of−1.02×10⁴ K .

Calculate the activation energy for the reaction.

Express your answer with the appropriate units.

6)

Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The osmotic pressures required for this process can be as high as 19.1 atm . What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 28 ∘C ?

At 1 atm, how much energy is required to heat 93.0 g of H₂O(s) at -14.0 degrees C to H₂O(g) at 141.0 degrees C?