Questions
Bonding and Molecular Geometry Pre-Laboratory Question 1. Most elements exist as components of compounds rather than...
Bonding and Molecular Geometry
Pre-Laboratory Question
1. Most elements exist as components of compounds rather than in a free state. Explain why.
2. Use colored pencils to lightly shade each element in the Periodic Table of Electronegativity Values. Color 1 Color 2 Color 3 Color 4 0 – 0.9 1.0 – 1.9 2.0 – 2.9 3.0 – 4.0 Laboratory Questions
1. How does electronegativity influence the bond character between two elements?
2. Describe the conditions that make covalent compounds polar.
3. List the advantages of each type of model and the information that it provides and then list the limitations of that model. Molecular Formula Structural Formula Condensed Structural Formula Skeletal Model Ball-and-Stick Model Space-Filling Model
4. Both the alkene C4H8 and the alkyne C4H6 have rigid bond structures. However, C4H8 can form three isomers, whereas C4H6 can form only two isomers. Why is this so?
5. Are these molecules isomers? Why or why not?
6. Which of the following molecules are geometric isomers, and which are structural isomers? Which molecule is in the trans position and which is in the cis position?
7. The skeletal model of benzene is often drawn like this:
In: Chemistry
Weston Industries has a debt–equity ratio of 1.1. Its WACC is 8.2 percent, and its pretax...
|
Weston Industries has a debt–equity ratio of 1.1. Its WACC is 8.2 percent, and its pretax cost of debt is 6.4 percent. The corporate tax rate is 35 percent. |
| a. |
What is the company’s cost of equity capital? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) |
| Cost of equity capital | % |
| b. |
What is the company’s unlevered cost of equity capital? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) |
| Unlevered cost of equity capital | % |
| c-1. |
What would the cost of equity be if the debt–equity ratio were 2? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) |
| Cost of equity | % |
| c-2. |
What would the cost of equity be if the debt–equity ratio were 1.0? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) |
| Cost of equity | % |
| c-3. |
What would the cost of equity be if the debt–equity ratio were zero? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) |
| Cost of equity | % |
In: Finance
The following data represent petal lengths (in cm) for independent random samples of two species of...
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
| 5.3 | 5.6 | 6.3 | 6.1 | 5.1 | 5.5 | 5.3 | 5.5 | 6.9 | 5.0 | 4.9 | 6.0 | 4.8 | 6.1 | 5.6 | 5.1 |
| 5.6 | 4.8 | 5.4 | 5.1 | 5.1 | 5.9 | 5.2 | 5.7 | 5.4 | 4.5 | 6.4 | 5.3 | 5.5 | 6.7 | 5.7 | 4.9 |
| 4.8 | 5.9 | 5.1 |
Petal length (in cm) of Iris setosa: x2; n2 = 38
| 1.4 | 1.6 | 1.4 | 1.5 | 1.5 | 1.6 | 1.4 | 1.1 | 1.2 | 1.4 | 1.7 | 1.0 | 1.7 | 1.9 | 1.6 | 1.4 |
| 1.5 | 1.4 | 1.2 | 1.3 | 1.5 | 1.3 | 1.6 | 1.9 | 1.4 | 1.6 | 1.5 | 1.4 | 1.6 | 1.2 | 1.9 | 1.5 |
| 1.6 | 1.4 | 1.3 | 1.7 | 1.5 | 1.6 |
(a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to two decimal places.)
| x1 = | |
| s1 = | |
| x2 = | |
| s2 = |
(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.)
| lower limit | |
| upper limit |
In: Math
1D List Practice Could you write the code to solve the following problem that uses 1D...
1D List Practice
Could you write the code to solve the following problem that uses 1D lists?
You have been tasked with writing a Python program that will assist the CAU Registrar’s Office with determining the following:
- the average GPA of the freshman class after their first semester
- the top five GPAs
- the number of students who are eligible for the Dean’s List (i.e., their GPA is 3.25 or higher)
Your program will contain at least three (3) functions - main, getInfo, and compute - that complete the following tasks:
- a function named main that “kicks off” the program with a description of what the program will do. It will then call the getInfo function (see below).
- a function named getInfo reads the file named freshmen.txt and puts the GPAs of the freshman class into a list (named students). This function will then call (with the list as the argument) the compute function (see below).
- a function compute will calculate and display
(to the screen):
- the average GPA of the freshman class after their first semester
- the top five GPAs
- the number of students who are eligible for the Dean’s List (i.e., their GPA is 3.25 or higher)
Note: To test/run your program, you will need to generate a file named freshmen.txt that contains 450 GPAs (each on its own line) that have been randomly generated, ranging from 1.0 to 4.0
In: Computer Science
Suppose the inflation rate is expected to be 6.3% next year, 4.15% the following year, and...
Suppose the inflation rate is expected to be 6.3% next year, 4.15% the following year, and 3.65% thereafter. Assume that the real risk-free rate, r*, will remain at 2.3% and that maturity risk premiums on Treasury securities rise from zero on very short-term bonds (those that mature in a few days) to 0.2% for 1-year securities. Furthermore, maturity risk premiums increase 0.2% for each year to maturity, up to a limit of 1.0% on 5-year or longer-term T-bonds.
a.
Calculate the interest rate on 1-year Treasury securities. Round
your answer to two decimal places.
Calculate the interest rate on 2-year Treasury securities. Round
your answer to two decimal places.
Calculate the interest rate on 3-year Treasury securities. Round
your answer to two decimal places.
Calculate the interest rate on 4-year Treasury securities. Round
your answer to two decimal places.
Calculate the interest rate on 5-year Treasury securities. Round
your answer to two decimal places.
Calculate the interest rate on 10-year Treasury securities.
Round your answer to two decimal places.
Calculate the interest rate on 20-year Treasury securities.
Round your answer to two decimal places.
In: Finance
Ironman steps from the top of a tall building. He falls freely from rest to the...
Ironman steps from the top of a tall building. He falls freely from rest to the ground a distance of h. He falls a distance of h/ 4 in the last interval of time of 1.0 s of his fall.
Hint: First, compute the velocity when Ironman reaches the height equal to the distance fallen. This requires that you do the following: define origin as the bottom of the building. Then use x-x0 = -v0*(t-t0)-(1/2)g(t-t0)^2 where x=0 and x0= (distance fallen) and t-t0 is the time interval given. In this formulation, you are going to get magnitude of v0 since you already inserted the sign. You then insert v0 that you just calculated into the kinematic equation that involves v, g, and displacement (v^2-v0^2 = 2g(height-(distance fallen)), but now v (which is the final velocity is v0 from above) and v0 in this case is the velocity that the Ironman has when he begins to fall, which is 0. This gives a quadratic equation for height h, and you will need to use the binomial equation to solve for h. Choose the larger of the two solutions.
Part A
What is the height h of the building?
Express your answer using two significant figures.
In: Physics
Be sure to answer all parts. In 2006, an ex-KGB agent was murdered in London. Subsequent...
Be sure to answer all parts. In 2006, an ex-KGB agent was murdered in London. Subsequent investigation showed that the cause of death was poisoning with the radioactive isotope 210Po, which was added to his drinks/food. (a) 210Po is prepared by bombarding 209Bi with neutrons. Write an equation for the reaction. Show the mass number and atomic number of all species. Tip: use the sup-subscript button to insert all symbols. (b) Who discovered the element polonium? Marie and Pierre Curie Enrico Fermi (c) The half-life of 210Po is 138 d. It decays with the emission of an α−particle. Write an equation for the decay process. Show the mass number and atomic number of all species. Tip: use the sup-subscript button to insert all symbols. (d) Calculate the energy of an emitted α−particle. Assume both the parent and daughter nuclei to have zero kinetic energy. The atomic masses are: 210Po (209.98285 amu), 206Pb (205.97444 amu), α−particle (4.00150 amu). (Enter your answer in scientific notation). × 10 J (e) Ingestion of 1.0 mg of 210Po could prove fatal. What is the total energy released by this quantity of 210Po, assuming every atom decays? (Enter your answer in scientific notation). × 10 J
In: Chemistry
The following data represent petal lengths (in cm) for independent random samples of two species of...
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
| 5.0 | 5.7 | 6.4 | 6.1 | 5.1 | 5.5 | 5.3 | 5.5 | 6.9 | 5.0 | 4.9 | 6.0 | 4.8 | 6.1 | 5.6 | 5.1 |
| 5.6 | 4.8 | 5.4 | 5.1 | 5.1 | 5.9 | 5.2 | 5.7 | 5.4 | 4.5 | 6.4 | 5.3 | 5.5 | 6.7 | 5.7 | 4.9 |
| 4.8 | 5.7 | 5.1 |
Petal length (in cm) of Iris setosa: x2; n2 = 38
| 1.6 | 1.6 | 1.4 | 1.5 | 1.5 | 1.6 | 1.4 | 1.1 | 1.2 | 1.4 | 1.7 | 1.0 | 1.7 | 1.9 | 1.6 | 1.4 |
| 1.5 | 1.4 | 1.2 | 1.3 | 1.5 | 1.3 | 1.6 | 1.9 | 1.4 | 1.6 | 1.5 | 1.4 | 1.6 | 1.2 | 1.9 | 1.5 |
| 1.6 | 1.4 | 1.3 | 1.7 | 1.5 | 1.6 |
(a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to two decimal places.)
| x1 = | |
| s1 = | |
| x2 = | |
| s2 = |
(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.)
| lower limit= | |
| upper limit= |
In: Math
Two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force.
Part F - Example: Finding Two Forces (Part I)
Two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. The block in (Figure 1) has a mass m=10kg and is being pulled by a force F on a table with coefficient of static friction μs=0.3. Four forces act on it:
The applied force F (directed θ=30∘ above the horizontal).
The force of gravity Fg=mg (directly down, where g=9.8m/s2).
The normal force N (directly up).
The force of static friction fs (directly left, opposing any potential motion).
If we want to find the size of the force necessary to just barely overcome static friction (in which case fs=μsN), we use the condition that the sum of the forces in both directions must be 0. Using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as:
Fcosθ−μsN=0
Fsinθ+N−mg=0
In order to find the magnitude of force F, we have to solve a system of two equations with both F and the normal force N unknown. Use the methods we have learned to find an expression for F in terms of m, g, θ, and μs (no N)
Part G - Example: Finding Two Forces (Part II)
For the situation in Part F, find the magnitude of the force F (in kg⋅m/s2) necessary to make the block move
In: Physics
Directions: Place all answers on this sheet and show your work. Calculate a client’s intake and...
Directions: Place all answers on this sheet and show your work.
- Calculate a client’s intake and output (I&O) in milliliters (mL) from 0700 to 1500.
Breakfast: 3/4 cup of coffee
3 oz glass orange juice
Lunch: 4 oz diet soda
6 oz chicken broth
Voided: 200mL at 1000
200mL at 1400
Emesis: 125mL at 1300
IV fluids: Lactated Ringers @ 100 mL/hr
Total 8 hour intake = mL
Total 8 hours output = ml
- The nurse receives an order to give atropine 300mcg SQ now. The medication is available in 1mg/mL vial. How many mL should the nurse administer? (Do not round)
300/100 = 0.3 ml/hr
- Calculate the IV infusion rate using a pump (mL/hr) for 1L LR over 8 hours.
1000/
- Calculate the blood transfusion rate using a pump (mL/hr). 1 unit PRBC (225mL) over 2 hours. (round to the nearest whole number)
- Calculate the following IVPB infusion using a pump (mL/hr). Zofran 20mg IVPB every 6 hours infused over 30 minutes. The IV bag contains 20mg in 100mLs NS.
- How long will it take to finish infusing 1L of D5NS 100mL/hr?
- The nurse receives an order to give heparin 1,500 units/hr. The IV bag contains 20,000 units heparin in 500mL D5W. Calculate the IV rate in mL/hr. (do not round)
In: Nursing