QUESTION 1

Magnesium chloride (MgCl₂) dissolves completely in water. What is the molarity of the Mg²⁺(aq) cation in a 0.00500 M MgCl₂(aq) solution? (3 significant digits, units M)

1 points   

QUESTION 2

What is the molarity of Cl^-(aq) anion in the same solution as Question 1? (3 significant digits, units M)

1 points   

QUESTION 3

The parts per million (ppm) unit can be expressed as mg solute per liter solution (mg/L) for dilute aqueous solutions. Convert the Mg²⁺(aq)concentration from Question 1 into units of ppm. Use the molecular weight of the ion in the conversion. (Round to 3 significant digits, units ppm)

1 points   

QUESTION 4

Convert the Cl^-(aq) concentration from Question 2 into units of ppm. (Round to 3 significant digits, units ppm)

1 points   

QUESTION 5

How many grams of Mg²⁺(aq) are contained in 100.0 g of 0.00500 M MgCl₂(aq) solution? Assume the solution density is 1.0 g/mL, like water. (Round to 3 significant digits, unit g)

1 points   

QUESTION 6

What is the % by mass of Mg²⁺(aq) in the solution from Question 5? (Round to 3 significant digits, unit %)

1 points   

QUESTION 7

Questions 7 through 10 are linked together. A solution of red dye #40 was made with a concentration of 0.000440 M. Use Beer's Law, A = ebcwhere c stands for the concentration, to calculate the absorbance (A) if the value of the molar absorptivity (e) is 1700 Lmol^-1cm^-1 and the cell length (b, the diameter of the vial) is 2 cm. (Use 4 significant digits, no units)

1 points   

QUESTION 8

A student diluted the original 0.000440 M red dye solution (from Question 7) by measuring 25.00 mL with a pipet into a 100.0 mL volumetric flask and then adding water up to the line on the flask. Calculate the new concentration of the diluted solution. (Round to 3 significant digits, unit M)

1 points   

QUESTION 9

The absorbance was 0.388 when the student's diluted solution (from Question 8) was measured in the Microlab spectrometer. Use the e and b values from Question 7 to calculate the actual concentration of the diluted solution. (Round to 3 significant digits, unit M)

1 points   

QUESTION 10

The student desires a concentration of 0.000044 M, exactly one tenth of the original red dye solution strength. What volume of the original 0.000440 M solution should be measured into a 100.0 volumetric flask, to be diluted with water up to the line of the flask? (3 significant digits, unit mL)

Siegel Company manufactures a product that is available in both a deluxe model and a regular model. The company has manufactured the regular model for years. The deluxe model was introduced several years ago to tap a new segment of the market. Since introduction of the deluxe model, the company’s profits have steadily declined and management has become increasingly concerned about the accuracy of its costing system. Sales of the deluxe model have been increasing rapidly.

Manufacturing overhead is assigned to products on the basis of direct labor-hours. For the current year, the company has estimated that it will incur $6,088,700 in manufacturing overhead cost and produce 17,000 units of the deluxe model and 118,000 units of the regular model. The deluxe model requires 1.0 hours of direct labor time per unit, and the regular model requires 0.5 hour. Material and labor costs per unit are as follows:

    Model
Deluxe   Regular
Direct materials   $   145      $   105     
Direct labor   $   11      $   7     

Required:
1-a. Using direct labor-hours as the base for assigning manufacturing overhead cost to products, compute the predetermined overhead rate.
1-b. Using the predetermined overhead rate computed in 1-a above and other data from the problem, determine the unit product cost of each model.
2. Management is considering using activity-based absorption costing to apply manufacturing overhead cost to products. The activity-based system would have the following four activity cost pools:

Activity Cost Pool   Activity Measure   Estimated Overhead Cost
Purchasing   Purchase orders issued   $   233,100
Processing   Machine-hours      3,500,000
Scrap/rework   Scrap/rework orders issued      804,600
Shipping   Number of shipments      1,551,000
       $   6,088,700


   
Expected Activity
Activity Measure   Deluxe   Regular   Total
Purchase orders issued   420   840   1,260
Machine-hours   20,000   30,000   50,000
Scrap/rework orders issued   600   480   1,080
Number of shipments   5,640   8,460   14,100


Determine the predetermined overhead rate for each of the four activity cost pools.
3. Using the predetermined overhead rates you computed in part (2), do the following:
a. Compute the total amount of manufacturing overhead cost that would be applied to each model using the activity-based absorption costing system. After these totals have been computed, determine the amount of manufacturing overhead cost per unit of each model.
b. Compute the unit product cost of each model (direct materials, direct labor, and manufacturing overhead).

Siegel Company manufactures a product that is available in both a deluxe model and a regular model. The company has manufactured the regular model for years. The deluxe model was introduced several years ago to tap a new segment of the market. Since introduction of the deluxe model, the company’s profits have steadily declined and management has become increasingly concerned about the accuracy of its costing system. Sales of the deluxe model have been increasing rapidly.

Manufacturing overhead is assigned to products on the basis of direct labor-hours. For the current year, the company has estimated that it will incur $6,088,700 in manufacturing overhead cost and produce 17,000 units of the deluxe model and 118,000 units of the regular model. The deluxe model requires 1.0 hours of direct labor time per unit, and the regular model requires 0.5 hour. Material and labor costs per unit are as follows:

Required:

1-a. Using direct labor-hours as the base for assigning manufacturing overhead cost to products, compute the predetermined overhead rate.

1-b. Using the predetermined overhead rate computed in 1-a above and other data from the problem, determine the unit product cost of each model.

2. Management is considering using activity-based absorption costing to apply manufacturing overhead cost to products. The activity-based system would have the following four activity cost pools:

Determine the predetermined overhead rate for each of the four activity cost pools.

3. Using the predetermined overhead rates you computed in part (2), do the following:

a. Compute the total amount of manufacturing overhead cost that would be applied to each model using the activity-based absorption costing system. After these totals have been computed, determine the amount of manufacturing overhead cost per unit of each model.

b. Compute the unit product cost of each model (direct materials, direct labor, and manufacturing overhead).

Siegel Company manufactures a product that is available in both a deluxe model and a regular model. The company has manufactured the regular model for years. The deluxe model was introduced several years ago to tap a new segment of the market. Since introduction of the deluxe model, the company’s profits have steadily declined and management has become increasingly concerned about the accuracy of its costing system. Sales of the deluxe model have been increasing rapidly.

Manufacturing overhead is assigned to products on the basis of direct labor-hours. For the current year, the company has estimated that it will incur $6,088,700 in manufacturing overhead cost and produce 17,000 units of the deluxe model and 118,000 units of the regular model. The deluxe model requires 1.0 hours of direct labor time per unit, and the regular model requires 0.5 hour. Material and labor costs per unit are as follows:

Required:

1-a. Using direct labor-hours as the base for assigning manufacturing overhead cost to products, compute the predetermined overhead rate.

1-b. Using the predetermined overhead rate computed in 1-a above and other data from the problem, determine the unit product cost of each model.

2. Management is considering using activity-based absorption costing to apply manufacturing overhead cost to products. The activity-based system would have the following four activity cost pools:

Determine the predetermined overhead rate for each of the four activity cost pools.

3. Using the predetermined overhead rates you computed in part (2), do the following:

a. Compute the total amount of manufacturing overhead cost that would be applied to each model using the activity-based absorption costing system. After these totals have been computed, determine the amount of manufacturing overhead cost per unit of each model.

b. Compute the unit product cost of each model (direct materials, direct labor, and manufacturing overhead).

Smoky Mountain Corporation makes two types of hiking boots—the Xtreme and the Pathfinder. Data concerning these two product lines appear below:

The company has a traditional costing system in which manufacturing overhead is applied to units based on direct labor-hours. Data concerning manufacturing overhead and direct labor-hours for the upcoming year appear below:

Required:

1. Compute the product margins for the Xtreme and the Pathfinder products under the company’s traditional costing system.

2. The company is considering replacing its traditional costing system with an activity-based costing system that would assign its manufacturing overhead to the following four activity cost pools (the Other cost pool includes organization-sustaining costs and idle capacity costs):

Compute the product margins for the Xtreme and the Pathfinder products under the activity-based costing system.

3. Prepare a quantitative comparison of the traditional and activity-based cost assignments.

repare a quantitative comparison of the traditional and activity-based cost assignments. (Round your intermediate calculations to 2 decimal places and "Percentage" answers to 1 decimal place.)

A.) The equilibrium constant for the reaction A(g) ⇌ B(g) is 10² . A reaction mixture initially contains [A] = 18.6 M and [B] = 0.0 M. Which statement is true at equilibrium?

B.) Determine the value of K_c for the following reaction if the equilibrium concentrations are as follows: [H₂]_eq = 0.14 M, [F ₂]_eq = 0.39 M, [HF]_eq = 1.6 M.

H₂(g) + F ₂(g) ↔ 2 HF(g)

C.) The equilibrium constant is equal to 5.00 at 1300 K for the reaction:

2 SO₂(g) + O₂(g) ↔ 2 SO₃(g).

If initial concentrations are [SO₂] = 3.60 M, [O₂] = 0.45 M, and [SO₃] = 5.40 M, the system is

D.) The equilibrium constant, K _p, equals 3.40 for the isomerization reaction:

cis-2-butene ↔ trans-2-butene.
If a flask initially contains 0.250 atm of cis-2-butene and 0.165 atm of trans-2-butene, what is the equilibrium pressure of each gas?

E.) Consider the reaction SO₂(g) + NO₂(g) ↔ NO(g) + SO₃(g) at 460°C. What is the equilibrium concentration of the SO₃ if the initial concentrations are [SO₂] = [NO₂] = 3.00 x 10^-3 M and [NO] = [SO₃] = 4.00 x 10^-2 M? The value of the equilibrium constant for the reaction is 85.0 at 460°C.

Consider the following comparative balance sheets for the Midland Manufacturing Corporation.

Prepare a statement of cash flows (using the indirect method) for the Midland Manufacturing Corporation for the year ending December Year 2, based on the comparative balance sheets shown above. Use minus sign to indicate cash outflows. Enter your answers in millions. For example, an answer of $1.2 million should be entered as 1.2, not 1,200,000. Round your answers to one decimal place.

Resolve Example 6.20, except with the generation at bus 2 set to a fixed value (i.e., modeled as off of AGC). Plot the variation in the total hourly cost as the generation at bus 2 is varied between 0 to 200 MW in 5-MW steps, resolving the economic dispatch at each step. What is the relationship between bus 2 generation at the minimum point on this plot and the value from economic dispatch in Example 6.20? Assume a load scalar of 1.0

Example 6.20: PowerWorld Simulator case Example 6_20 uses a five-bus, three-generator lossless case to show the interaction between economic dispatch and the transmission system (see Figure 6.19). The variable operating costs for each of the units are given by C1 = 10P1 + 0.016P 1 Square $yhr C2 =8P2 + 0.018P2 Square $yhr C4 = 12P4 + 0.018P 4 Square $yhr where P1, P2, and P4 are the generator outputs in megawatts. Each generator has minimum/maximum limits of 100 <=P1 <=400 MW 150 <=P2 <= 500 MW 50 <= P4 <=300 MW In addition to solving the power flow equations, PowerWorld Simulator can simultaneously solve the economic dispatch problem to optimally allocate the generation in an area. To turn on this option, select Case Information, Aggregation,
Areas… to view a list of each of the control areas in a case (just one in this example). Then toggle the AGC Status field to ED. Now anytime the power flow equations are solved, the generator outputs are also changed using the economic dispatchInitially, the case has a total load of 392 MW with an economic dispatch of P1 =141 MW, P2 = 181, and P4 = 70, and an incremental operating cost, l, of 14.52 $?MWh. To view a graph showing the incremental cost curves for all of the area generators, right-click on any generator to display the generator’s local menu, and then select All Area Gen IC Curves (right-click on the graph’s axes to change their scaling). To see how changing the load impacts the economic dispatch and power flow solutions, first select Tools, Play to begin the simulation. Then, on the oneline, click on the up/down arrows next to the Load Scalar field. This field is used to scale the load at each bus in the system. Notice that the change in the Total Hourly Cost field is well approximated by the change in the load multiplied by the incremental operating cost. Determine the maximum amount of load this system can supply without overloading any transmission line with the generators dispatched using economic dispatch.

1. conic memory is a type of memory that holds visual information for about half a second (0.5 seconds). To demonstrate this type of memory, participants were shown three rows of four letters for 50 milliseconds. They were then asked to recall as many letters as possible, with a 0-, 0.5-, or 1.0-second delay before responding. Researchers hypothesized that longer delays would result in poorer recall. The number of letters correctly recalled is given in the table.

(a) Complete the F-table. (Round your values for MS and F to two decimal places.)

(b) Compute Tukey's HSD post hoc test and interpret the results. (Assume alpha equal to 0.05. Round your answer to two decimal places.)

The critical value is    for each pairwise comparison.

c) Which of the comparisons had significant differences? (Select all that apply.)

a. Recall following no delay was significantly different from recall following a one second delay.

b. Recall following a half second delay was significantly different from recall following a one second delay.

c. The null hypothesis of no difference should be retained because none of the pairwise comparisons demonstrate a significant difference.

d. Recall following no delay was significantly different from recall following a half second delay.

2. An educator wants to evaluate four different methods aimed at reducing the time children spend "off task" in the classroom. To test these methods, she implements one method in each of four similar classrooms and records the time spent off task (in minutes) in each classroom. The results are given in the table.

(a) Complete the F-table. (Round your answers to two decimal places.)

3. After computing a one-way within-subjects analysis of variance at a 0.1 level of significance, a psychologist begins to calculate a Bonferroni procedure. If she will make a 5 pairwise comparisons, what will be the testwise alpha?

The following data represent petal lengths (in cm) for independent random samples of two species of Iris.

Petal length (in cm) of Iris virginica: x₁; n₁ = 35

Petal length (in cm) of Iris setosa: x₂; n₂ = 38

(a) Use a calculator with mean and standard deviation keys to calculate x₁, s₁, x₂, and s₂. (Round your answers to two decimal places.)

(b) Let μ₁ be the population mean for x₁ and let μ₂ be the population mean for x₂. Find a 99% confidence interval for μ₁ − μ₂. (Round your answers to two decimal places.)

(c) Explain what the confidence interval means in the context of this problem. Does the interval consist of numbers that are all positive? all negative? of different signs? At the 99% level of confidence, is the population mean petal length of Iris virginica longer than that of Iris setosa?

Because the interval contains only positive numbers, we can say that the mean petal length of Iris virginica is longer. Because the interval contains only negative numbers, we can say that the mean petal length of Iris virginica is shorter.     Because the interval contains both positive and negative numbers, we cannot say that the mean petal length of Iris virginica is longer.

(d) Which distribution did you use? Why?

The Student's t-distribution was used because σ₁ and σ₂ are unknown. The standard normal distribution was used because σ₁ and σ₂ are unknown.     The standard normal distribution was used because σ₁ and σ₂ are known. The Student's t-distribution was used because σ₁ and σ₂ are known.

Do you need information about the petal length distributions? Explain.

Both samples are large, so information about the distributions is needed. Both samples are large, so information about the distributions is not needed.     Both samples are small, so information about the distributions is needed. Both samples are small, so information about the distri