hoanganhchiendp

What is the answer to 5. and 6.

Numerical Response

5. Select the correct numbers from the above cell that represent the

anode __________________              (Record in the first column) 

cathode _________________              (Record in the second column) 

anion flow _______________              (Record in the third column) 

electron flow_____________               (Record in the fourth column) 

(Record your four digit answer in the numerical-response section on the answer sheet.)

i

6. The equation for the half-reaction that occurs at the anode is       i        , and at the cathode you would observe       ii        being formed.

 

Row	i	ii
A.		bubbles
B.		a brown substance
C.		bubbles
D.		a brown substance

 

Answer the following redox titration questions and submit your complete solution below. (10 points each)

1.  A 0.9882 gram sample of iron ore is dissolved, the iron reduced to Fe2+, and the solution was titrated with 36.40 mL of 0.02065 M KMnO4 in acid solution.

(a)  Write the titration reaction. 

(b)  Calculate the %FeO (M.M. = 71.85) in the sample.

2.  A sample of primary standard grade K2Cr2O7 (MM = 294.20) weighing 0.2153 g is dissolved, the solution acidified and excess KI added. The liberated I2 requires 44.86 mL of the Na2S2O3 for titration.

(a)  Write the titration reaction. 

(b)  Calculate the molarity of the titrant solution. 

Predict whether the following reactions would occur spontaneously in aqueous solution at 25°C.
Assume that the initial concentrations of dissolved species are all 1.0 M. 

(a)  Ca(s)   +   Cd2+(aq)   --->     Ca2+(aq)   +   Cd(s)

(b)   2Br-(aq)   +   Sn2+(aq)  --->   Br2(l)   +   Sn(s)

(c)    2Ag(s)    +     Ni2+(aq)    --->   2Ag+(aq)    +    Ni(s)

(d)   Cu+(aq)   +   Fe3+(aq)    --->     Cu2+(aq)   +   Fe2+(aq)

Use the standard reduction potential values from the potential table provided in this module. 

Upload your answer and complete solution below. 

1. How can the story's protagonist increase control over his or her big emotional challenge that keeps recurring?
   
   Deadline: 20 May, 08:00
   Design an emotion control for the protagonist of the story (it could be you) following the guidelines below.
   
   1. who is the protagonist and what is their problem? - 1p
   2. proposed control of the situation - 1p
   3. cognitive impact (on what is in consciousness) - 1p
   4. physiological impact - 1p
   5. impact on expression - 1p
   
   

1. How can the story's protagonist increase control over his or her big emotional challenge that keeps recurring?
   
   Deadline: 20 May, 08:00
   Design an emotion control for the protagonist of the story (it could be you) following the guidelines below.
   
   1. who is the protagonist and what is their problem? - 1p
   2. proposed control of the situation - 1p
   3. cognitive impact (on what is in consciousness) - 1p
   4. physiological impact - 1p
   5. impact on expression - 1p

Kim Nguyen was leading a meeting to create the work breakdown structure (WBS) for her  company's IT upgrade project. This project was necessary because of several high-priority, Internet-based applications the company was developing. The IT upgrade project involved creating  and implementing a plan to make all employees' IT assets meet new corporate standards within nine months. These standards specified the minimum requirements for each desktop or laptop computer, including the type of processor, amount of memory, hard disk size, type of network connection, and software.

Let f : R 2 → R 2 and g : R 2 → R be differentiable, and let ~a ∈ R 2 be fixed. Suppose: f(~a) = [2, 3], g(~a) = [3], [D f(~a)] = [1 2, 3 4], [D g(~a)] = [3 −7] Here, expressions like [7] mean a 1 × 1 matrix (i.e., a scalar). The commas mean the start of another row in the matrix.

(a) Evaluate (fg)(~a). (b) Evaluate [D(fg)(~a)] h~ for h~ = [1, −1/2]

Fructose 1-P Glucose-1-P catalyzed by a hexose isomerase. Calculate the equilibrium constant and free energy when the equilibrium concentrations of [F16p] = 2 mM and [G1P] = 4 mM?

show that (P -1)² /(P -1)!

Assuming all of the conditions for interference have been met, does the data above provide sufficient evidence at an a=0.05 level that a larger proportion of people in small towns marry before age 25 than people in big cities?

1. Write the balanced reduction half-reaction:

b. O2(g) is reduced to hydrogen peroxide (acidic condition)

* * the answer is not 0.695 or 0.69

2. Write the balanced reduction half-reaction:

a. hydrogen peroxide is reduced to water (acidic condition)

* the answer is not 1.776 or 1.78

3. Calculating cell potentials, E° cell

* Predict the standard cell potential when Mg and Cd are added to a solution containing Mg^2+ and Cd^2+ ions.

       Cd^2+ (aq) + 2e^-  => Cd(s)               E° = -0.040 V

     Mg^2+ (aq) + 2e^-  => Mg(s)               E° = -2.37 V

* since Cd^2+ has the least negative value, it is reduced and so Mg is oxidized

* E° cell = E° red - E° ox = -0.40 - (-2.37V) = 1.97 V

=> The spontaneous reaction is :

        Cd^2+ (aq) + Mg^2+ (aq) => Cd(s)  + Mg(s)

#

What is the Eocell (volts) for the degradation of H2O2 to water and oxygen?

2 H2O2  --> 2 H2O + O2  Eocell = ?

A sample of an ideal gas  from A to B, the process is adiabatic ; from B to C, it is isobaric process with 100kilojoulse of energy entering the system by heat. From C to D, the process is isothermal from D to A, it is isobaric with 150 kilojoulse of energy determine: (a).  Amount of work done. (b). Heat added or removed (c). Chemical internal energy in eac process. (d). The total work done. (e). The total heat added or removed. (f). The total change in iternal energy.

 REVIEWING THE 100 BEST COMPANIES TO WORK FOR Each year Fortune magazine devotes an issue to the top 100 best companies to work for.  Find the most recent of Fortune that does this.  First, develop a numerical summary that describes the 100 companies in terms of their relative industries.  Which industries are the most dominant?

Pick one of the more dominant industries (preferably one in which you would like to work) and choose a specific highlighted company.

2. A dilute peroxide solution was prepared by quantitatively diluting 10 mL stock H2O2 (MW = 34.0147) to 250mL using a volumetric flask. 50 mL aliquot of the diluted peroxide solution was titrated using the previously standardized KMnO4 in problem 1. Titration of the sample required 29.00 mL titrant and the blank containing 50 mL 1:5 H2SO4 required 0.75 mL of the standard KMnO4. Calculate the concentration in %w/v of the stock H2O2. (Hint: H2O2 produces O2 under acidic condition).

Note: Follow rules of Sig Fig!

# 18.73 is incorrect

3. Which of the following is the likely label of the commercial H2O2 solution?

- 30 Volumes agua oxigenada   - 40 Volumes agua oxigenada - 50 Volumes agua oxigenada - 100 Volumes agua oxigenada  - 3 Volumes agua oxigenada - 10 Volumes agua oxigenada - 20 Volumes agua oxigenada   # 30 volumes is incorrect     4. A 1.9300 g impure sample of Fe(NH4)2(SO4)2 (FW = 392.14) was dissolved in 75 mL 0.75 M H2SO4 and was titrated with the standard KMnO4 in problem 1. Titration of the sample required 24.00mL while the blank containing 75mL 0.75 M H2SO4 required 0.75 mL of the KMnO4 titrant. Calculate the concentration of Fe(NH4)2(SO4)2 in %w/w in the impure sample.    # 8.75 is incorrect     5. Which of the following statements is/are FALSE? - KMnO4 solutions should be stored in an amber colored bottle protected by light to prevent oxidation
- MnO2 solids which may form during storage can be filtered out using a filter paper
- purple solution of KMnO4 in burette may be cleaned using oxalate or peroxide - the burette should be washed with the titrant first before titration - HCl cannot be used in place of H2SO4
-  all statements are false
     

Nick wonders, "What is this all  [the large parties] for?" Then, the gentleman replies, "That my dear, is the question."

This conversation is only in the movie, not the novel. Why would the director and screen writer have added this short conversation? (In other words, what effect would it have on the movie's audience?)

Show that W= {P∈ P∞ / x divides p} is a subsapce of P∞ ( Hint p ∈ W as p=xq for some q ∈ P∞). this question is from intersection of the subspace is also ia subapsce of V.

Delta Enterprises trades an asset that costs $55,000 and hadaccumulated depreciation of $37,000 for another asset with a fairmarket value of $20,000. The exchange is deemed to lack commercialsubstance. Delta pays $500 in cash. Delta's asset has a fair marketvalue of $19,500. Compute Delta's recognized gain or loss on theexchange.

D & D trades an asset that had a book value of $18,000 for another asset with a fair market value of $20,000. Assume lack of commercial substance. J & J pays $500 in cash. D & D’s asset has a fair market value of $19,500. D & D would record the cost of the new asset at?

$21,500

$18,500

$19,500

$20,000

Analyze the IR spectra . What are the key peaks and bonds of functional groups?

 Blood Typing

Description:

2. Virtual Laboratory: Using the table, answer the following questions. (2 points each)

5. What is the blood type of Sample 4? A. None of the choices. B. Blood type B      C. Blood type AB D. Blood type O     E. Blood type A    6. What is the blood type of Sample 2? A. Blood type A B. Blood type O C. None of the choices. D. Blood type B      E. Blood type AB  7. Which, if any, of the blood samples tested can the patient with blood type B⁺ receive? A. Sample 3 B. Sample 2 C. Sample 1 D. Sample 4 E. Both sample 1 and 3. 8. What is the blood type of Sample 3? A. Blood type AB B. Blood type B      C. Blood type O D. None of the choices. E. Blood type A  9. What is the blood type of Sample 1? A. Blood type A B. Blood type O C. None of the choices. D. Blood type B E. Blood type AB 

Match the hormones that are supposed to be added to a plant in order to achieve the following results:
 
a. Auxin
b. Gibberellin
c. Cytokinin              
d. Abscisic Acid
e. Ethylene

1. unpollinated flowers are treated with this hormone so ovary enlarges and becomes a seedless fruit.

2.substitute for temperature or light cues in plant seeds to get them to germinate.

3. black spots on banana skin are spots where these are produced inducing ripening

4. seeds/bulbs stay dormant during winter to ensure survival of the plant when it germinates

5. most grape growers spray this in vines to increase length of branches between fruit clusters for more air spaces among fruits to lower fungal infections

6. sprayed on cut leaves and stems so they will remain green longer while unsprayed leaves will turn yellow and die

Reaction Time of Unlearned Responses
 
Results:
Person A:
Trial 1 _______ cm; Trial 2 _______ cm; Trial 3 _______ cm = ________ (average)
Person B:
Trial 1 _______ cm; Trial 2 _______ cm; Trial 3 _______ cm = ________ (average) 

1. Based on acceleration due to gravity (9.8 m/sec2), calculate the speed of the subject’s reflexes by                                                    time (sec) = sq. root of (2 x distance (m)/9.8m/s2).

      Ex. If the average measurement is 25cm, then divide 0.25 by 9.8, multiply by 2, and get the square root.
Convert the average distance to time:
Student A - _____sec.                        Student B - _____sec.
Compare the results among housemates.
Housemate range (maximum, minimum) ________ - ________ sec.
              There are at least 10 synapses involved in this response. Based on your results, what is the minimum amount of time that a neuron requires to receive and send a signal? ____________ seconds.

1. Cats make great pets, you have to be affectionate with them. Not always coming when you call them. Because they are rather independent animals. Many people prefer dogs, you can train them to come, or sit, or fetch a bone. With cats, on the other hand, you have to be willing to let them live their own lives if you attempt to train them you may become discouraged. If you put two cats in the same room you are in for quite a treat. They chase each other, usually all in fun and when one catches the other the real show begins. Often they will cuddle and clean each other sometimes they will fight. The wise pet owner will know when to break up a fight and when to let go since it is only play for the cats. They can be great company if you understand them.

1.  Who helped the ladybug get matches in the minuscule valley of lost ants

• Does it seem likely that she might be compressing nerves in the area between the acromion and the humerus?

solve it step by step urgently

HELP how do you do these two?? how do you do the work and what are the answers step by step?? URGENT

  

  

 

1. A 0.8250 g of soda ash sample was dissolved in distilled H2O and diluted to 250-mL using a volumetric flask.  A 50.00 mL aliquot portion of the dilute soda ash solution needed 4.50 mL of 0.1200 M HCl to reach the phenolphthalein end point and 10.00 mL to reach the methyl orange end point. 

Consider the titration carried out in the 50-mL aliquot portion of the dilute soda ash solution:

Calculate the number of millimoles of HCl needed to reach the phenolphthalein end point.

2. Calculate the number of millimoles of HCl needed to reach the methyl orange end point.

3. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of Na2CO3 are there in the aliquot portion that was titrated?

4. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of NaHCO3 are there in the aliquot portion that was titrated?   5. What is the %Na2CO3 (%w/w) present in the soda ash sample? FW Na2CO3 = 105.99 g/mol (Hint: Use dilution factor)   6. What is the %NaHCO3 (%w/w) present in the soda ash sample? FW NaHCO3 = 84.01 g/mol (Hint: Use dilution factor)   7. What is the % inert component in the soda ash sample? (Hint: Subtract %Na2CO3 and %NaHCO3 from 100%)    8. Which of the following is an incompatible mixture in soda-ash analysis? NaOH - NaHCO3NaOH - Na2CO3 Na2CO3 - NaHCO3

A sample of material contains for its active components NaOH, Na2CO3, NaHCO3 or compatible mixtures of these. Two samples, each weighing 1.000 g, are dissolved in H2O. To one sample phenolphthalein is added and the solution is titrated cold with 1.038 M HCl, of which, 17.96 mL is required. The other sample is titrated cold, with methyl orange as indicator, and 21.17 mL of the same acid is required. What alkalis are present, and what is the percentage of each in the original sample?

What is the % Na2CO3? (Correct: 13.37)

What is the % NaHCO3? (Incorrect: 16.84)

What is the % NaOH? (Incorrect: 69.79)

What is the % inert material?

The Michaelis-Menten (M-M) equation is the starting point for all of classical enzyme kinetics. M & M came up with a simple chemical scheme involving enzyme (E), substrate (S) and the consequent product (P).

Draw a reaction progress graph. Assume a starting concentration of [S] = 10 μM and the total enzyme concentration [E]T = 1 μM, Be sure to include [P] as a function of time as well, and any intermediates included in part (a). Using you graph indicate how to estimate the initial velocity of the reaction, v0. You may assume the reaction proceeds completely to products.

1.0 M H2SO4
1.0M H2SO3
1.0 M CH3COOH
1.0M H2CO3