A buffer solution is prepared from equal volumes of 0.200 M acetic acid and 0.600 M sodium acetate use 1.80 *10^-5 as Ka for acetic acid.

a.) what is the pH of the solution

b.) Is the solution acidic or basic

c.) What is the pH of a solution that results when 3.00ml of 0.034 M HCl is added to 0.200L of the original buffer

The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours (A?h). A 50 A?h battery can supply a current of 50 A for 1.0 h, or 25 A for 2.0 h, and so on.

(I need some help on Part A & C Thank you : )

Part A

What total energy can be supplied by a 10V , 80A?h battery if its internal resistance is negligible?

Express your answer using two significant figures.

Part B

What volume (in liters) of gasoline has a total heat of combustion equal to the energy obtained in part (a)? (See Section 17.6; the density of gasoline is 900 kg/m3.)

Express your answer using two significant figures.

Ans: 7.0*10^-2

Part C

If a generator with an average electrical power output of 0.45kW is connected to the battery, how much time will be required for it to charge the battery fully?

Express your answer using two significant figures.

You plan to purchase a $270,000 house using a 15-year mortgage obtained from your bank. The mortgage rate offered to you is 5.00 percent. You will make a down payment of 20 percent of the purchase price.

a. Calculate your monthly payments on this mortgage.
b. Construct the amortization schedule for the mortgage. How much total interest is paid on this mortgage?

Construct the amortization schedule for the mortgage? (Do not round intermediate calculations. Round your answers to 2 decimal places. (e.g., 32.16))

How much total interest is paid on this mortgage?

**new answer needed****

Applying Principles of the Nervous System to Pharmaceutical Research

Imagine you are a student studying for your pharmacy technician certification exam. Your friend is quizzing you over drugs that affect the nervous system.

As a pharmacy technician you may be asked by a customer how a drug works or why they are taking a particular medication. They may be taking many different medications and can’t remember why they take a certain one.

Unit 4 DQ Question: Serotonin is a neurotransmitter involved in the control of mood. Based on this description, predict what types of health conditions Selective Serotonin Reuptake Inhibitors (SSRIs) could be used to treat.

One of the conditions for Uniform Circular Motion is that the acceleration be centripetal and directed toward the center of motion. What would the effect be of a non-zero acceleration parallel to the tangential velocity?

Prof. Orlando Karam maintains an Ubuntu Linux server for his class. Every semester he needs to create an account for each student. It takes a lot of time to create these accounts one by one interactively. So he decides to automate the process by writing a script. You are Orlando’s TA and volunteered to complete the task. Please propose a solution and write a script (either Bash or Perl) to implement your solution. Basic requirements:  The script reads from a CSV file for student information (exported from Excel). The file is made up of the lines like this: Jack,Zheng,jzheng3 //[first name],[last name],[campus email id] Mark,Cuban,mcuban2 …  Please make up your own CSV file (with at least 5 students/lines) for testing purpose.  Every student is assigned a common initial password (you will determine the password).  Students are required to change their passwords at first login.  All student accounts should be assigned to a “student” group. This group already exists in the system (you need to create this group first for testing purpose).  Make some other assumptions if not specifically required. Reminder: you will and should do some research on how to read and parse CSV files, and how to process passwords programmatically. Execute your script and take two screen shots: a. The “passwd” file content, with the new accounts clearly shown. b. The “shadow” file content, with the new accounts clearly shown. 2. Login with one of the new student account and show that you have successfully logged in using the newly created account. Take a screen shot showing the user id in the terminal. 3. Compile one PDF document with the script, the CSV file content, and all three screen shots, clearly labeled for each part.

Determine the amount of heat (in kJ) given off when 1.38 X 10⁴ g of NO₂ is produced according to the following equation: 2 NO(g) + O₂ goes to 2NO₂ (g) Delta H = -114.6 kJ/mol Enter your answer in scientific notation

The following data table gives the position of an object during freefall. The time interval between adjacent points is 1/60 seconds.

What is the instantaneous velocity (in cm/s) of the object when it is at position 9?

Financial Records

Create a program to store weekly expenses and revenues over a period of time. The program should

store the expenses and revenues in two global array variables. Values stored in the array at index k

represent the total revenues/expenses recorded during the k(th) week. Assume that the maximum number of weeks tracked is 250.

Add the following functions to your program:

-

A function that finds the total of all expenses incurred since week t for a given t.

-

A function that records the total expenses and revenues for the next unrecorded week. It must check if there is still space in the array.

-

A function that prints the number of weeks recorded

-

A function that prints all revenues and expenses recorded

-

A function that returns a pointer to the largest revenue recorded

Organize the program so the function prototypes are presented

first, and the definitions after the main

function. Your program should keep asking the user to select

one of the following options and execute

the corresponding function based on the user choice:

(A)

computed the total of all expenses,

(B)

add a new expense/revenue ,

(C)

print the number of weeks recorded,

(D)

print all revenues and expenses recorded,

(E)

print the largest revenue recorded, or

(F)

exit the program.

At 25 ∘C phosphoric acid, H3PO4, has the following equilibrium constants:

H3PO4(aq)+H2O(l)H2PO4−(aq)+H2O(l)HPO42−(aq)+H2O(l)⇌⇌⇌H3O+(aq)+H2PO−4(aq)H3O+(aq)+HPO42−(aq)H3O+(aq)+PO43−(aq

What is the pH of a solution of 0.300 M K2HPO4, potassium hydrogen phosphate? Express your answer numerically to the hundredths place.

What is the pH of a solution of 0.700 M KH2PO4, potassium dihydrogen phosphate?

Express your answer numerically to the hundredths place.

1. The temperature to which air must be cooled to result in a relative humidity of 100% is called the

a) dew point temperature b) condensation point temperature c) wind cooling cool factor d) absolute temperature

2. Air moving from a higher altitude to a lower altitude on the side of a mountain

a) is cooled since cool air is more dense b) will have a higher absolute humidity c) will have a higher relative humidity d) is warmed by compression

3. The intertropical convergence zone has tropical rain forests because

a) sinking air warms, increasing the relative humidity b) rising air cools as it is pushed upward c) it is a high pressure belt of descending air d) dry rising air is moved horizontally by the jet stream

4. The principal source of water vapor in Earth's hydrologic cycle is

a) the ocean b) lakes, rivers, and soil c) plants and animals d) burning of wood, fossil fuels, and crop residue

5. Showers or thunderstorms are usually associated with which type of cloud?

a) stratus b) cirrus c) cumulus d) any of the above

6. A cold front is the boundary between

a) the southward edge of a cold air mass b) the northward edge of a warm air mass c) a moving warm air mass and a cooler air mass d) a moving cold air mass and a warmer air mass

7. Most of the southeastern part of the United States has a climate that is

a) Mediterranean b) humid continental c) marine d) humid subtropical

Why do the passengers in high-altitude jet planes feel the

sensation of weight while passengers in the International Space Station do not?