Friday

April 29, 2016
Total # Posts: 750

**Science**

A solution contains 0.01M ethyl acetate, 0.10M acetic acid and 0.10M ethanol. For the same equilibriujm constant of 2.00, calculate the equilibrium concentrations of ethyl acetate, ethanol, and acetic acid in the solution.
*July 24, 2012*

**Calc**

derivative? f(x)= e^(-2x^2+25x+8)
*July 20, 2012*

**chemistry**

E degrees (V) A galvanic cell based on the following half reaction s Au3+ 3e- ----> Au 1.50 Mg2+ 2e- ------> Mg -2.37 The cell is set up at 25 C with [Mg2+] = 1.00 x 10^-5 M The cell potential is observed to be 4.01 V. Calculate the [Au3+] that must be present. Au3+ = ...
*July 13, 2012*

**chemistry**

Consider the galvanic cell constructed from the following metals and their corresponding metal ions: E degrees (V) M^3+^ + 3e^-^ ----> M 0.29 N^2+^ + 2e^-^ ----> N 0.61 calculate the value of K for the cell reaction at 25C
*July 13, 2012*

**chemistry**

an aqueous solution of pdcl2 is electrolyzed for 27.4 seconds during this time 0.1064 g of Pd is deposited on the cathode. Calculate the average current used in the electrolysis.
*July 13, 2012*

**chemistry**

a certain radioactive nuclide has a half life of 5.00 hour. Calcuate the decay rate for 1.000 mole of this nuclide __________ decay s-1
*July 12, 2012*

**Physics PLEASE help!**

I REALLY NEED HELP WITH THIS!!!!! In this problem, your task is to analyze a lead balloon. The balloon in question is a hollow sphere of diameter of 20.0 m, constructed from a lead foil 0.25 mm thick and filled with helium gas. Below the balloon, a passenger basket is ...
*June 16, 2012*

**Physics**

A satellite with a mass of 284 kg approaches a large planet at a speed vi,1 = 14.4 km/s. The planet is moving at a speed vi,2 = 11.0 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a direction opposite to its ...
*June 6, 2012*

**physics**

The coordinates of an object moving in the xy plane vary with time according to the equations x = −6.85 sin ùt and y = 4.00 − 6.85 cos ùt, where ù is a constant, x and y are in meters, and t is in seconds. (a) Determine the components of ...
*June 3, 2012*

**Physics**

two skaters, each of mass 55 kg, approach each other along parallel paths separated by 3.8 m. They have opposite velocities of 1.9 m/s each. One skater carries one end of a long pole with negligible mass, and the second skater grabs the other end of it as she passes. The ...
*June 2, 2012*

**math**

the letters elementary are placed in a bag. one letter is randomly selected from the bag. what is the probability the letter selected is a consonant?
*May 26, 2012*

**algebra**

Does the parabola open up or down? -10m + m 2 = 21 + y
*May 9, 2012*

**GED-Word Problems**

14000 just times both number
*May 8, 2012*

**GED-Word Problems**

2970
*May 8, 2012*

**math**

its 4 1/4
*May 7, 2012*

**physics**

by gravity its going to far at a rate of 9.8 per sec you can drop basicly anything down a building and it will still fall the same speed. well basicly gravity
*May 3, 2012*

**physics**

i believe its was 9.8 mph persec
*May 3, 2012*

**physics**

30 if you divide them
*May 3, 2012*

**MATH**

Solve this system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions 2x-y=0 3x+y=5
*May 3, 2012*

**history**

Hamilton / Jefferson Readings Quiz can someone help me check my answers the answers with an (*) at the end them are the ones i think are right 1. Alexander Hamilton thought that having a virtuous citizenry was a necessity in a Repulic. A) True * B) False 2. Who said "The ...
*May 2, 2012*

**history**

the Puritan dilemma can someone help me check my answers the answers with an (*) at the end them are the ones i think are right 1. Englishmen rejoiced when Henry VIII turned his back on the Pope because now they felt they would be free to join the Protestant Reformation and ...
*May 2, 2012*

**history**

Hamilton / Jefferson Readings Quiz can someone help me check my answers the answers with an (*) at the end them are the ones i think are right 1. Alexander Hamilton thought that having a virtuous citizenry was a necessity in a Repulic. A) True * B) False 2. Who said "The ...
*May 1, 2012*

**history**

the Puritan dilemma can someone help me check my answers the answers with an (*) at the end them are the ones i think are right 1. Englishmen rejoiced when Henry VIII turned his back on the Pope because now they felt they would be free to join the Protestant Reformation and ...
*May 1, 2012*

**history**

Hamilton / Jefferson Readings Quiz 1. Alexander Hamilton thought that having a virtuous citizenry was a necessity in a Repulic. A) True B) False 2. Who said "The goodness of a government consists in a vigorous execution?" A) Thomas Jefferson B) Alexander Hamilton 3. ...
*May 1, 2012*

**history**

the Puritan dilemma 1. Englishmen rejoiced when Henry VIII turned his back on the Pope because now they felt they would be free to join the Protestant Reformation and gain a purer church. A) True B) False 2. Puritan's believed that marriage came before God. A) True B) ...
*May 1, 2012*

**math**

Evaluate the expression 8a + b for the given variable. b = 3a – 2
*April 30, 2012*

**Statistics**

“How would you describe your own physical health at this time? Would you say physical health is—excellent, good, only fair, or poor?” The Gallup Poll asked this question of 1005 randomly selected adults, of whom 29% said “excellent.” Suppose that in ...
*April 30, 2012*

**MATH URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

Tara is researching the stork population living in a bird reserve. On her first day, she captures and tags 37 birds. Two weeks later, she captures 48 birds and finds that 30 are not tagged. Estimate the actual number of storks in the bird reserve. 27. In a marketing survey ...
*April 27, 2012*

**Chemistry**

It is not wrong, correct way to calculate answers thanks DrBob222
*April 20, 2012*

**marketing**

Mark is trying to determine his firm's average cost per unit of production. He finds that the cost for all labor and materials is $80,000 and fixed overhead expenses are $40,000. If the company produces 20,000 items in the time period, the average cost is_____.
*April 12, 2012*

**Discrete Mathematics**

It was proven during the previous lecture that 1+2+3+....+n=[n(n+1)]/2. Using that result, find the sum of all 3-digit palindromes: a palindrome is a number that can be written as ABA, where 1=<A<=9 and 0<=B<=9. Hint: decompose ABA = 100*A + 10*B + A and use above ...
*April 10, 2012*

**Chemistry**

That's wrong
*April 9, 2012*

**American Literature**

To what does the title of the play Dutchman by Amiri Baraka allude?
*April 8, 2012*

**Politics**

In congress.
*April 6, 2012*

**Politics**

Which one is more preferable agency or sociological representation? Would be nice if someone can give any ideas on it. thanks
*April 6, 2012*

**algebra**

What is the value of n in the equation 12n + 8 = 11? Please submit your answer as a reduced fraction.
*March 21, 2012*

**Pre-algebra**

1/2x = x/2 its a fraction not division
*March 12, 2012*

**Chemistry**

If Kc = 0.450 at 40 degrees C and Kc = 0.545 at 90 C, what is the delta H for the reaction? X <---> Y ____ kJ would this problem include using a van hoff factor..?
*March 6, 2012*

**Trig**

N32.47E
*March 5, 2012*

**Algebra**

The amount of carbon dioxide (in pounds per 15,000 cubic miles) released by a certain SUV depends on its fuel efficiency according to the formula W = 33x2 − 2145x + 43,000 (12 ≤ x ≤ 33) where x is the fuel efficiency of an SUV in miles per gallon. According ...
*February 21, 2012*

**math**

How many different whole numbers can be made with the digits 5, 7, 8? For this problem, each different whole number may have 1, 2, or 3 digits and a digit may be repeated.
*February 21, 2012*

**Algebra**

Gymnast Clothing manufactures expensive soccer cleats for sale to college bookstores in runs of up to 500. Its cost (in dollars) for a run of x pairs of cleats is C(x) = 3000 + 9x + 0.1x2 (0 ≤ x ≤ 500). Gymnast Clothing sells the cleats at $130 per pair. Find the ...
*February 19, 2012*

**chemistry**

it was correct! what a stupid, unfortunate mistake =/ thanks for explaining it!
*February 19, 2012*

**chemistry**

I'm scared D:
*February 19, 2012*

**chemistry**

Assuming equal concentrations, rank these aqueous solutions by their freezing point.? K2CO3, Li3PO4, Sn(ClO3)4, NH4I I tried to rank them according to the number of ions but i can't get it. highest freezing point --> lowest freezing point Sn(ClO3)4 -> Li3PO4 -> ...
*February 19, 2012*

**Chemistry**

I am very sorry Dr. Bob =/ thank you so much for the help though I understand now
*February 19, 2012*

**Chemistry**

so would it be.. 1.35 = 1.206i i = 1.119? is that when you plug it in with osmotic pressure = i(m)(r)(t)? i'm sorry for my mistake!
*February 19, 2012*

**Chemistry**

I'm sorry! I did post it incorrectly! it was 0.05 M of solution not 0.500!
*February 19, 2012*

**Chemistry**

A solution is made by dissolving 0.500 mol of HF in enough water to make 1.00 L of solution. At 21 C, the osmotic pressure of the solution is 1.35 atm. What is the percent ionization of this acid? This is what i did.. is it correct? (1.35 atm) = (2)(M)(0.08206)(294 K) M = 0....
*February 19, 2012*

**english**

chick: a young woman A. direct definition B. indirect definition a
*February 18, 2012*

**english**

indirect definitions are subject to individual interpretation.
*February 18, 2012*

**english**

Indirect meanings are those meanings that we believe and assume to be true without looking them up in a dictionary. Sometimes these can even be true. Direct meanings are those that are proven to be true and factual. We can find those definitions in a dictionary or text books.
*February 18, 2012*

**english**

indirect definitions are subject to individual interpretation.
*February 18, 2012*

**Chemistry**

In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was added to 50.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 24.50 degrees C to 28.59 degrees C. If the solution has the same density and specific heat as water, what is ...
*February 10, 2012*

**Chemistry**

I got it thanks!
*February 9, 2012*

**Chemistry**

wait i got (18g)(4.18J)(28.59-24.50) which brings me to 307.7316, is that right? is that when i divide by 0.03? and then divide by 1000? that brought me to 10.257 is this correct..?
*February 9, 2012*

**Chemistry**

In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was added to 50.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 24.50 degrees C to 28.59 degrees C. If the solution has the same density and specific heat as water, what is ...
*February 9, 2012*

**Chemistry**

Consider an ideal gas encloesd in a 1.00 L container at an internal pressure of 10.0 atm. Calculate the work, w, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 20.0 L. w = ____ J now calculate the work done if this process is carried ...
*February 9, 2012*

**Chemistry**

ohhhhhhhh so 305J = (86.9)(0.128)(Tf-20) 305J = (11.1232)(Tf-20C) 305J = 11.1232[Tf] - 222.464 527.464 = 11.1232[Tf] Tf = 47.42 C is that correct..?
*February 8, 2012*

**Chemistry**

The specific heat of a certain type of metal is 0.128 J/(g-c). What is the final temperature if 305 J of heat is added to 86.9 g of this metal initially at 20 degrees C? Tfinal = ___ C
*February 8, 2012*

**Chemistry**

I figured it out! Sorry! Thank you to anyone who might have given it a try already!
*February 8, 2012*

**Chemistry**

When a 8.00 g of KBr is dissolved in water in a calorimeter that has a total heat capacity of 4.6 kJ·K^-1 the temperature decrases by 0.290 K. Calculate the molar heat of solution of KBr in kJ/mol. DeltaH soln = ?
*February 8, 2012*

**Math**

Professor Sousa has 83 students in her anthropology lecture class. 42 of the students are sophomores and the others are juniors. What fraction of the class is sophomores?
*February 2, 2012*

**chemistry**

A 141-mg sample was placed on a watch glass that weighed 9.203 g. What is the weight of the watch glass and sample in grams?
*January 31, 2012*

**chemistry**

A 141-mg sample was placed on a watch glass that weighed 9.203 g. What is the weight of the watch glass and sample in grams?
*January 31, 2012*

**Math**

140
*January 30, 2012*

**physics**

Mastering physics will take this answer: --> 26,64 <-- degrees.
*January 29, 2012*

**algebra**

43=3(x+1)+2x
*January 25, 2012*

**Chemistry**

The vapor pressure, P, of a certain liquid was measured at two temperatures, T. Represented in a table: T (in Kelvin) ------- P(in kPa) [325] --------------- [4.00] [775] --------------- [8.59] What is the enthalpy of vaporization for this liquid? (Delta H vap) in kJ/mol? If ...
*January 23, 2012*

**physics**

Method 1 Step 1: Solve for acceleration From F=ma, rearrange to a=F/m a=F/m= (53000 N)/(1.13 x 〖10〗^5 kg)= .469026549 〖m/s〗^2 Step 2: Solve for time t=∆v/a=(88.4 m/s)/(.469026549 〖m/s〗^2 )=188.4754716 seconds Step 3: Convert ...
*January 20, 2012*

**9th gradae physical science**

Since the density is 8.92 9/cm3. When you plot it the first time it would be Y=8.92 and X= 1, the second time the Y=17.84 and X = 2, the third time the Y=26.76 and the X is 3. These three plots are enough to show you that there is direct proportion and thus the slope is equal ...
*January 20, 2012*

**math**

using these alphabets a,b,c,d e,f spell these letters a=1,b=2,c=3,d=4,e=5,f=6 2+5+4=11 bed 2+5+1+4=12 bead 6+5+5+4=20 feed what numbers and alphabet = 30
*January 19, 2012*

**math**

using these alphabets a,b,c,d e,f spell these letters a=1,b=2,c=3,d=4,e=5,f=6 2+5+4=11 bed 2+5+1+4=12 bead 6+5+5+4=20 feed what numbers and alphabet = 30
*January 19, 2012*

**math**

using these alphabets a,b,c,d e,f spell these letters a=1,b=2,c=3,d=4,e=5,f=e 2+5+4=11 bed 2+5+1+4=12 bead 6+5+5+4=20 feed what numbers and alphabet = 30
*January 19, 2012*

**science**

80 years x 4in per year = 800 cm = .008 km
*January 18, 2012*

**Chemistry**

How many grams of CaCO3 can be precipitated if 50.0 ml of 0.10 M CaCl2 are mixed with 30 ml of 0.2 M KCO3?
*January 13, 2012*

**7th grade Math**

Thank you again.
*January 11, 2012*

**7th grade Math**

Hi Reiny, Before posting this question, I thought the same way by putting the same amount of white marbles but if you add the total amount of marbles for both bags and that wouldn't be equal since the question mentioned "Two bags contain the same number of marbles&...
*January 11, 2012*

**7th grade Math**

Hi Kelly, For this one. Multiply 14.28 by 3 = 42.84 *53 marbles Do you mean to say *43 marbles? rounded up from 42.84? Thanks for your help.
*January 11, 2012*

**7th grade Math**

Two bags contain the same number of marbles. In one bag, the ratio of black marbles to white marbles is 4:3. In the other bag, the ratio is 3:2. Which bag contains more black marbles? Thanks!
*January 11, 2012*

**Physics**

Method 1 Step 1: Solve for acceleration From F=ma, rearrange to a=F/m a=F/m= (53000 N)/(1.13 x 〖10〗^5 kg)= .469026549 〖m/s〗^2 Step 2: Solve for time t=∆v/a=(88.4 m/s)/(.469026549 〖m/s〗^2 )=188.4754716 seconds Step 3: Convert ...
*January 3, 2012*

**algebra 2**

The largest possible frame width is 17 inches long per side.
*December 29, 2011*

**math**

This question was written by a moron. Where does it say that he could only spend his monthly salary? What happened to the $2500 he saved last month, or the rest of the money he has in the bank? He could've saved any amount from $1-5000. Not to mention the bigger problem. ...
*December 7, 2011*

**Government**

Identify two alternative solutions for the high case load of the supreme court
*December 7, 2011*

**algebra**

A machine's ideal temperature is below 135 degreesF. The temperature T in degrees x minutes after it is turned on is T=-0.005x^2 = 0.45x + 125. Will the temperature ever exceed 135 degrees. Use the discriminate to decide. If the machine operates for 90 minutes before being...
*December 5, 2011*

**math**

A carpebter is making a brace in the shape of a right triangle. The hyp. is 41 inches long. The longer leg will be 31 inches longer than the shorter leg. Write a quadriatic equation that models the situation.
*December 2, 2011*

**math**

A baseball player hits a bakk that has the path of a parabola. It is at its highest point at second base which is 127 ft. from home plate. How far is the outfielder who catches the ball?
*December 2, 2011*

**math**

The price of a hair clip is .75 cents. The sales tax is 0.04 of the purchase price. How much is the sales tax on the hair clip?
*December 2, 2011*

**math**

The price of a hair clip is .75 cents. The sales tax is 0.04 of the purchase price. How much is the sales tax on the hair clip?
*December 2, 2011*

**8th Grade Chemistry**

This is from the Glencoe book Chemistry, Book L. Unlike sodium and chlorine, some atoms becomre more stable by sharing_______, forming______________rather than charged__________. The bonds in a molecule of oxygen are _______ _______ bonds, while the bonds in molecule of water ...
*November 15, 2011*

**social studies**

explain whether you think it is better for the country to have a policy of isolationism or one of imperialism. help meee its a study question for tommorrows test i need to know the answer!
*November 13, 2011*

**Physics **

In figure, the mass m2 = 10 kg slides on a frictionless shelf. The coefficients of static and kinetic friction between m2 and m1 = 5 kg are µs = 0.6 and µk = 0.4. (a) What is the maximum acceleration of m1? (b) What is the maximum value of m3 if m1 moves with m2 ...
*October 17, 2011*

**science**

How do you calculate how long will it take an object dropped from a window to fall a distance of 78.4 meters?
*October 17, 2011*

**calculus**

Consider the function y=x/(x+1) a) Find dy/dx b) Find the equation of the line tangent to the curve at x=-2 c) Find the equation of the line normal to the curve at x=1
*October 15, 2011*

**Calculus**

Could someone please help me on this question where you find the limit. I'm having a test tomorrow and I'm a little confused. lim -x/√(4-x^2) x-->-2+ Any help would be greatly appreciated. Thanks in advance!!
*October 10, 2011*

**alan b shepard**

If charles wants the area of the trapezoid to be 65 square feet. What should be the measure of the second base
*October 4, 2011*

**Physics**

You and your friend are practicing pass plays with a football. You throw the football at a 35.0° angle above the horizontal at 19.0 m/s. Your friend starts right next to you, and he moves down the field directly away from you at 5.50 m/s. How long after he starts running ...
*September 30, 2011*

**Calculus**

Why would it be 1?? I'm so confused...
*September 29, 2011*

**Calculus**

Could anyone please help me figure out the discontinuity that is removable of the following function?? Any help would be greatly appreciated! Thanks in advance!!! f(x)=4x/x^2+x-2
*September 29, 2011*

**algebra**

in a triangle abc, the measure of angle b is 34 degrees more than three times the measure of angle a. the measure c is 56 degrees more than the angle a. what is the measure of each angle
*September 28, 2011*