A student mixed 5.00 mL of 0.0120 M Pb(NO3)2 with 5.00 mL of 0.0300 M KI and observed a yellow precipitate.

a. What is the molecular formula of the precipitate? PbI2

b. How many moles of Pb2+ are present initially? ___

c. How many moles of I- are present initially? ___ The concentration of I- at equilibrium is experimentally determined to be 8.0*10^-3 M.

d. How many moles of I- are present in the solution (10mL)? ___

e. How many moles of I- precipitated? ___

f. How many moles of Pb2+ remain in solution? ___

g. What is the concentration of Pb2+ in the equilibrium solution? ____ M (Equilibrium solution is still 10mL)

h. Determine Ksp of PbI2 from this data. ____

Please answer and provide explanation on how to solve these problems. Thank you!

1) A block of mass 5.67 kg rests on a horizontal table. The block is pushed with a force of 70.2N that makes an angles of 25.0 degrees with the horizontal. The coefficient of kinetic friction between the block and surface of the table is 0.256. What is the acceleration of the block? What is its speed after traveling 2.30m?

2) The volume and the pressure of the Argon gas of 2.00 mol are 2.000L and 10.0atm respectively. The molar mass of Argon is 40.00 g/mol. Wha id the vrms speed of argon atom?

Compare this with vrms speed of hydrogen under the same conditions! Molar mass of hydrogen is 2,00g/mol.

1 atm = 10^5 Pa; 1L = 10^-3 m^3. R = 8.314 J/mol.k

3)A 250.0 g of copper calorimeter contain 500.0g of water at 20.0C. A block of mass 100.0g at 25.00C of water at 85.00C are added to the calorimeter. When thermal equilibrium is reached the final temperature of the system is 50.00C. What is the specific heat of the block?

Specific heat: Copper = 387J/kg.C; Water = 4186J/Kg.C

4) A container is filled up to the rim with 1.5L of mercury at 20C. he container is heated to 70C, 8ml of mercury spills out. Calculate the linear expansion coefficient of the container. The volume expansion of mercury is 1.8x10^-4/C. 1L = 10^-3 m^3, 1ml = 10^-3 L

if the nested solenoids were used as a step up transformer which coil would you connect the time varying current to? what is your predicted value of the ratio of the voltages?

if the nested solenoids were used as a step down transformer which coil would you connect the time varying current to? what is your predicted value of the ratio of the voltages?

In a development organization that has the quality records of the software projects it has developed over the past 20 years, what is/are methods that should be considered first to estimate activity effort and duration. Explain why the methods(s) should be considered first.

topic: deciding when to die , active euthanasia and physician assisted suicide. why did this topic capture your attention and how will it inform your life moving forward if at all?.

Assignment 3.1 - Is Your Organization Structure Strategic?

Analyze your current work environment (Walgreens) through the structural frame. Describe the structure of Walgreen's organization. Based on your experience and knowledge, was the structure of Walgreen's a strategic one or has it evolved as it has grown over time? Do you think that Walgreen's could benefit from reorganizing? What recommendations would you make, and why?

Discuss the phrase “let the buyer beware” and its relationship to an ethical marketing perspective.

in 300 words

4. Construct regular expressions for the following languages over the alphabet {a, b}: a. Strings that do not begin with an “a”.

b. Strings that contain both aa and bb as substrings.

5. Let ? = {? ?? ?? ? | ? > ? + ?}. a. List all strings of length 7. (use power notation: i.e. aabbbbaaaaaaaa is a2b 4a 8 )

b. Use the Pumping Lemma for Regular Languages to prove that L is not regular.

Two loudspeakers emit sound waves along the x-axis. A listener in front of both speakers hears a maximum sound intensity when speaker 2 is at the origin and speaker 1 is at x = 0.450 m . If speaker 1 is slowly moved forward, the sound intensity decreases and then increases, reaching another maximum when speaker 1 is at x = 0.850 m.

A.What is the frequency of the sound? Assume v_sound =340m/s.

B. What is the phase difference between the speakers?

a. On January ​1, 2018​, NRRC issued no par common stock for $ 425 comma 000. b. Early in January​, NRRC made the following cash​ payments: 1. For store​ fixtures, $ 45 comma 000 2. For merchandise​ inventory, $ 290 comma 000 3. For rent expense on a store​ building, $ 12 comma 000 c. Later in the​ year, NRRC purchased merchandise inventory on account for $ 245 comma 000. Before​ year-end, NRRC paid $ 155 comma 000 of this accounts payable. d. During 2018​, NRRC sold 2 comma 200 units of merchandise inventory for $ 225 each. Before​ year-end, the company collected 80​% of this amount. Cost of goods sold for the year was $ 310 comma 000​, and ending merchandise inventory totaled $ 225 comma 000. e. The store employs three people. The combined annual payroll is $ 86 comma 000​, of which NRRC still owes $ 4 comma 000 at​ year-end. f. At the end of the​ year, NRRC paid income tax of $ 19 comma 000. There are no income taxes payable. g. Late in 2018​, NRRC paid cash dividends of $ 36 comma 000. h. For store​ fixtures, NRRC uses the​ straight-line depreciation​ method, over five​ years, with zero residual value.

Rock, Paper, Scissors is a two-player game in which each player chooses one of three items. If both players choose the same item, the game is tied. Otherwise, the rules that determine the winner are: (a) Rock always beats Scissors (Rock crushes Scissors) (b) Scissors always beats Paper (Scissors cut Paper) (c) Paper always beats Rock (Paper covers Rock) Implement function rps() that takes the choice ('R', 'P', or 'S') of player 1 and the choice of player 2, and returns −1 if player 1 wins, 1 if player 2 wins, or 0 if there is a tie. 1

>>> rps('R', 'P') 1

>>> rps('R', 'S') -1

>>> rps('S', 'S') 0

What is the meaning of knocking

What’s the best company culture. How will that organization ensure that the company culture continues through the years?

also, what is the role of the individual in the organization? Consider everyone from the janitor to the CEO.?

Why is improvisation, creativity, and flexibility important? what are some examples of these activities being applied to real world emergency management incidents.

Miller Toy Company manufactures a plastic swimming pool at its Westwood Plant. The plant has been experiencing problems as shown by its June contribution format income statement below:

*Contains direct materials, direct labor, and variable manufacturing overhead.

Janet Dunn, who has just been appointed general manager of the Westwood Plant, has been given instructions to “get things under control.” Upon reviewing the plant’s income statement, Ms. Dunn has concluded that the major problem lies in the variable cost of goods sold. She has been provided with the following standard cost per swimming pool:

*Based on machine-hours.

During June, the plant produced 5,000 pools and incurred the following costs:

1. Purchased 24,500 pounds of materials at a cost of $2.95 per pound.

2. Used 19,300 pounds of materials in production. (Finished goods and work in process inventories are insignificant and can be ignored.)

3. Worked 4,600 direct labor-hours at a cost of $7.70 per hour.

4. Incurred variable manufacturing overhead cost totaling $5,070 for the month. A total of 1,300 machine-hours was recorded.

It is the company’s policy to close all variances to cost of goods sold on a monthly basis.

Required:

1. Compute the following variances for June:

a. Materials price and quantity variances.

b. Labor rate and efficiency variances.

c. Variable overhead rate and efficiency variances.

2. Summarize the variances that you computed in (1) above by showing the net overall favorable or unfavorable variance for the month.