Sunday

December 21, 2014

December 21, 2014

Total # Posts: 386

**Chemistry**

Given a diprotic acid, H2A, with two ionization constants of Ka1 = 3.9× 10–2 and Ka2 = 5.9× 10–8. Calculate the pH and molar concentrations of each protonated form for a: (a)0.135 M solution of H2A pH= [H2A]= [HA]= [A2-]= (b)0.135 M solution of NaHA pH= [...
*July 21, 2012*

**Chemistry**

I'm not getting the right answers for the pH, [H2A], and [HA^-] in part a (0.135 M solution for H2A) For H2A, I did 3.9E-2=x^2/(.135-x) Using the quadratic formula: x^2+.039x-.005265=0 x=.06725 [H^+]=[HA^-]=.06725 M pH=-log(.06725)=1.17 Finding [H2A]=.135 M-.06725 M=.06775...
*July 21, 2012*

**Chemistry**

Given a diprotic acid, H2A, with two ionization constants of Ka1=3.9E-2 and Ka2=5.9E-8. Calculate the pH and molar concentration of each protonated form for a 0.135 M solution of: (a) H2A (b) NaHA (c) Na2A
*July 21, 2012*

**algebra**

equivalent expression for 2log(x+1)-2log(x-1)-log(x-1)
*July 5, 2012*

**science**

two tall buildings are 200m apart .with what speed must a ball be thrown horizontally from the window 540 m above the ground in one building, so that it will enter a window 50m above the ground in the other?
*July 1, 2012*

**statistics**

how large a sample size is needed for 2 sided 95% confidence interval to have a length of 2 weeks when mean is 3.6
*June 28, 2012*

**physics **

a missile is launched an angle of 26.5 with respect to the horizontal. if it travels in the straight line over the level Terran for 2 minute and its average speed is 6000 mile per hour. what is its altitude?
*June 23, 2012*

**physics**

a television antenna is on the roof of the building. from a pt. on the ground 36.0 feet from the building , the angle of elevation of the top and the bottom of the antenna are 51 degree celsiusand 42 degree celsuis respectively. how tall is antenna?
*June 23, 2012*

**Calculus help~!**

Which is the standard form of the equation with p = 26, O= 3pi/4 ? SQRT2x – SQRT2y = 0 SQRT2x – SQRT2y + 52 = 0 SQRT2x + 52 = 0 SQRT2x + 52y = 0
*May 8, 2012*

**algebra**

the product of two consecutive even integersis 34 less than 7 times their sum.find the two integers.
*May 7, 2012*

**algebra **

One number is 10 more than twice another.Their product is 10 more than twice their sum.Find the numbers.
*May 7, 2012*

**HISTORY**

thank you bobpursley!
*May 4, 2012*

**HISTORY**

In 2001, President George W. Bush signed the Economic Growth and Tax Relief Reconciliation Act of 2001 (EGTRRA). This bill called for large tax cuts just as the Economic Recovery Act of 1981 had and largely benefited the wealthiest Americans. President Bush’s approach to...
*May 4, 2012*

**english**

this summer I will be going to a theme park with my best friend will go too. It will be fun. Because I like when I get to go with friends. I've never been to this theme park before I heard it is very fun. Someone in my class. ITold me that there is a rollercoaster that is ...
*May 1, 2012*

**Chemistry**

Find the molecular formula of a compound that is 48.38% carbon, 8.12% hydrogen, and 53.5% oxygen by mass and has a molecular weight of 328 g/mol.
*April 23, 2012*

**Chemistry**

A 15mL sodium hydroxide solution of unknown concentration is titrated with 34.5 mL of 1.2M HCl solution. What was the concentration of the sodium hydroxide solution?
*April 23, 2012*

**Chemistry**

A 12 mL sample of 0.4 M silver nitrate solution is mixed with 8 mL of 0.8 M sodium chloride solution. Determine the identity of precipitate and the number of grams produced.
*April 23, 2012*

**Math**

Math huron scored 84% on her last history test. Of she got 21 answers correct , how many question did the test have?
*April 15, 2012*

**Math**

Math huron scored 84% on her last history test. Of she got 21 answers correct , how many question did the test have?
*April 15, 2012*

**accounting**

which one of the following contingencies must be accrued on the balance sheet
*April 8, 2012*

**chemistry**

hello i'm doing a redox stoichiometry lab having to do with titration 6H +5H2O2 + 2MnO4 -- 5O2 + 2Mn2+ + 8H2O Why is H2O2 the source of O2 product in this titration?
*March 22, 2012*

**englsih**

in the poem the sloth by theodore roethke is there any personification, alliteration, imagery or onomatopoeia
*March 13, 2012*

**Math**

How many lines of symmetry does a regular decagon have? 0 5 10 20 I believe the answer is 10. Thanks for the help :)
*March 13, 2012*

**Physics**

The pulley system shown in the figure is used to lift a 52-{\rm kg} crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. The crate is rising with an acceleration of 2.5 m/s^2. Determine the tension in ...
*March 10, 2012*

**chem**

how do you tell which reactant is limiting reactant with the following information: mass of cup 55.78g mass o/sodium bicarbonate 1.01g mass o/citric acid 1.52g toal mass 58.31g mass of cup,solute after reaction 59.95g mass o/carbon dioxide .42g H3C6H5O7(aq) + 3 NaHCO3(aq) &#...
*March 9, 2012*

**math 2nd grade**

The word 'of' means to multiply. 3/5 of 10 3/5 X 10 = 30/5 = 6 1/3 of 12 1/3 X 12 = 12/3 = 4 hope this helps.
*March 5, 2012*

**Math**

3:18 9:54 and 6:36 Notice how you have to multiply the first number by 6 to get the second number. Hope this helps!
*March 5, 2012*

**math**

360/18 = x/1 One is the unit rate. Find X. 18 divide by 18 equals one. So take the 360 and divide by 18 which equals 20. Therefore x = 20. Hope this helps.
*March 5, 2012*

**7th grade math**

1.772453851(and then some more)
*March 5, 2012*

**math**

(1)Look at a ruler on the inches side. Notice between the zero and one there are little dashes. There should be 16 betweeen zero and one. 16 between one and two... Each dash is a sixteenth. So every other one is an eighth. (2) You want 10 inches out of 12 inches. Therefore 10/...
*March 5, 2012*

**8th grade math**

Parallel equations have the same slope. y = mx + b Perpendicular equations have a reciprocal and opposite slope. There is more to these questions than space allows here. Go to Khan Academy to view video's on how to do these equations.
*March 4, 2012*

**8th grade math**

2x = y + 1/2 Subtract y from both sides. 2x - y = 1/2 Done! Check out "khanacademy" for video's on how to solve Alebra problems.
*March 4, 2012*

**5th Grade Math**

Fluis ounces.
*March 4, 2012*

**Maths 10th grade**

x2 - 6x + m -3 = 0 x2 - 6x - 3 = -m Is a start. Then use the Quadradic Formula to find the factors.
*March 4, 2012*

**biochemistry**

explain the role of protein misfolding and aggregation in bovine spongeform encephalopathy
*March 1, 2012*

**Math**

3 x 2 = 6 square miles divided in half equated 3 square miles
*March 1, 2012*

**Math**

3 miles
*March 1, 2012*

**math 2nd grade**

otis
*February 29, 2012*

**math 2nd grade**

francisco
*February 29, 2012*

**Chemistry**

H3C6H5O7(aq) + 3 NaHCO3(aq) ¨ Na3C6H5O7(aq) + 3 H2O(l) + 3 CO2(g) How do you go about calculating theoretical yield of carbon dioxide from 1.00g of sodium bicarbonate andthe percentage yield
*February 28, 2012*

**college algebra**

do you have a graphic calculator
*February 28, 2012*

**Physics**

A sled which has a mass of 45kg is sitting on a horizontal surface. A force of 120 N is applied to a rope attached to the front of the sled such that the angle between the front of the sled and the horizontal is 35 degrees. As a result of the application of this force the sled...
*February 25, 2012*

**math**

The sum of the digits of a two-digit number greater than 50 is 12. The difference between the digits is 4. Find the two-digit number
*February 11, 2012*

**Maths**

4x-2=14x-92
*January 30, 2012*

**college algebra**

Solve the following equation in the complex number system. Please show all of your work. 2x^5-3x^4-32x+48=0
*January 18, 2012*

**precal**

For the given functions f, g, and h, find fogoh and state the exact domain of fogoh. Please show all of your work. f(x)=lnx g(x)=|x|-2 h(x)=4x-7
*January 18, 2012*

**College Algebra**

Verify that the function f and g, are inverses of each other by showing that f(g(x))=x and g(f(x))=x. Graph both the functions on the same graph. Please show all of your work. f(x)=-7/x-4 g(x)=4x-7/x
*January 18, 2012*

**College Algebra**

Solve the logarithmic equation. Express your solutions in exact form only. Please show all of your work. log base 6 (64x^3+1)-log base 6 (4x+1)=1
*January 18, 2012*

**College Algebra**

Find the inverse of the function below. Graph the function below and the inverse function. Determine the domain, range, and asymptotes of the function below and the inverse function. Please show all of your work. Show both graphs. f(x)=2ln(3-x)+6
*January 18, 2012*

**chemistry**

When a sample of carbon dioxide gas is at 36 degrees and 105 kpa is heated the new pressure of the gas becomes 165kpa. Determine the new temperature. Assume volume and amount of gas remain constant.
*January 15, 2012*

**history**

In the movie Lakota Woman- Siege at Wounded Knee; I need to understand what the alienation isues that Mary Crow Dog regarding her family. Do you have any ideas on where I can find this informaton?
*January 8, 2012*

**human services**

In the movie Lakota Woman- Siege at Wounded Knee; I need to understand what the alienation isues that Mary Crow Dog regarding her family. Do you have any ideas on where I can find this informaton?
*January 8, 2012*

**Calculus**

A balloon is rising vertically above a level, straight road at a constant rate of 1 foot/second. Just when the balloon is 65 feet above the ground, a bicycle passes under it going 17 feet/sec. How fast is the distance between the bicycle and balloon increasing 3 seconds later?
*October 25, 2011*

**Calculus**

A particle is moving along the curve whose equation is (xy^3)/(1+y^2)= 8/5. Assume the x-coordinate is increasing at the rate of 6 units/second when the particle is at the point (1,2). At what rate is the y-coordinate of the point changing at that instant? Is it rising or ...
*October 25, 2011*

**Physics**

An autographed baseball rolls off of a 0.85 m high desk and strikes the floor 0.68 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s
*October 24, 2011*

**Physics**

In a portable deﬁbrillator, energy is stored in a capacitor charged to a high potential diﬀerence. The capacitor is discharged through the patient’s body in a short, high-powered pulse. a) The capacitor in a portable deﬁbrillator is charged to 5000 V ...
*October 5, 2011*

**statistics**

given the following population data, x=17,13,23,15,19,19,21,28 calculate the z score value for a score of 18.
*September 19, 2011*

**math**

what is the rule for input 36 output 9 input 17 output 9 input 24 output1 input 18 output 0
*September 13, 2011*

**maths **

When Sandy decreased her savings by 75% and Gene increased hers by 40%, they would save $280 each. What were their total savings at first?
*September 8, 2011*

**maths**

Amy had 20% more money than John. After she spent 50% of her money, she had $72 less than John. How much money had she left?
*September 8, 2011*

**Maths**

At present, the ratio of Ann's age to Pamela's age is 4:3. Six yrs ago, their total age was 72yrs. what is Pamela's presnt age?
*September 8, 2011*

**Maths P5**

Mr Neo has fewer than 200 sweets. He wants to give his class an equal number of sweets. If he gives each pupil 3 sweets, he will have 70 left over. If he gives 5 sweets, he will need 10 more sweets. How many pupils are there in the class? How many sweets does Mr Neo have?
*August 21, 2011*

**Maths P5**

Cindy went to the store with just enough money to buy 11 files.However, she bought only 8 files and spent the rest of her money on 24 pens and rulers. The ratio of the number of pens to rulers was 3:5. Each ruler costs $0.80. Each pen costs $0.40 more than a ruler.How much did...
*August 21, 2011*

**Maths P5**

Daniel, Susan and Rick bought some cookies to sell. The cookies were sold at 6 for $2. Daniel sold 1/4 of the cookies. Susan sold 2/7 as many cookies as Rick. Daniel and Susan sold a total of 120 cookies. a)How many cookies did they sell altogether? b)How much did they collect...
*August 21, 2011*

**maths**

there are 15 guppies, 14 angelfish and 5 goldfish in a tank. how many guppies and goldfish must be added so that the ratio of guppies to angelfish to goldfish is 9:7:5
*August 20, 2011*

**Maths**

60% of the people on a bus are male. After 1/3 of the males alighted from the bus, what percentage of the people left on the bus are females?
*August 20, 2011*

**statics**

test 55%answer correct 44 correct answers how many questions on test
*August 8, 2011*

**chem**

why is hexane known as hydrocarbon?
*July 20, 2011*

**alegbra**

what is 6y square -5y -2??
*June 21, 2011*

**spanish**

I need someone to edit a spanish article for me. I can just email it to you if you leave your email here. Thanks!
*June 7, 2011*

**chemestry**

A gas is contained in a metal cylinder with a piston, so that the volume of the cylinder can change. If the gas initially occupies volume of 664 ml at 471 mmHg, what will be the volume if the temperature is kept constant and the pressure is changed to 408 mmHg?
*May 17, 2011*

**math**

Please help! :) Garden measures 30x20 Border has a width of x (I've already solved the first part of my problem, in that the width is 3) Border needs to be covered to a depth of 3 inches. Pine bark costs $29 per cubic yard. What will the material cost to lay the pine bark ...
*May 10, 2011*

**math**

Please help! :) Garden measures 30x20 Border has a width of x (I've already solved the first part of my problem, in that the width is 3) Border needs to be covered to a depth of 3 inches. Pine bark costs $29 per cubic yard. What will the material cost to lay the pine bark ...
*May 10, 2011*

**Algebra**

How do you graph 2 equations and then find the common area on the graph?
*May 4, 2011*

**computer science**

in mobile phone network how many times as strong would a signal be expected to be at 200 m from a base station, compare with at 600 m? is it 81 or 9 or 3 or 0.3 or 0.1 or 0.01
*April 6, 2011*

**Chemistry**

Balance this equation: Cu + H+(aq) + NO3-(aq) -- Cu2+(aq) + NO2 + H2O
*March 21, 2011*

**Math**

determine if the given function is one-to-one. if it is, find the inverse. f(x) = 8x - 4 A) f-1(x) = x+4 / 8 B) f-1(x) = x-4 / 8 C) Not one-to-one D) f-1(x) = x/8 + 4
*March 6, 2011*

**maths**

a pyramid has a spuare base with side length 20.a right circular cylinder has a diameter of 10 and a length of 10.the cylinder is lying on its side,completely inside the pyramid.the central axis of the cylinder lies parallel to and directly above a diagonal of the pyramids ...
*March 6, 2011*

**math**

how do I solve (.5x?)-1.4=.85
*March 1, 2011*

**psych**

Language Paper (12 points): This paper should be posted as a Word attachment in the Assignment Section and should be consistent with APA guidelines. Prepare a 1050 to 1400-word paper in which you examine language as it relates to cognition. Address the following: o Define ...
*February 14, 2011*

**Science**

a truck that weighs 19500 kg is moving at a velocity of 17 m/s west what is the trucks momentum? My answer: 1147.05...
*February 11, 2011*

**health**

List 3 word elements and examples in health field?
*February 10, 2011*

**the facility**

the director of a child care program may allow a care give to take a day or two rer year
*February 1, 2011*

**accounting**

how can I solve this problem stockholders invest $25,000 cash in the corporation
*February 1, 2011*

**Physics**

im not asking for help graphing. im asking which would go on x axis and which would go on y axis
*January 31, 2011*

**Physics**

create a graph with your data of rotational speed vs radius. independent variable goes on x axis. which is x axis and which is y axis out of radius and rotational speed
*January 31, 2011*

**Math**

nevermind i figured out y= -1 but how would you graph x+3=0
*January 24, 2011*

**Math**

x+3=0 how do you graph that? y= -1 how would you graph that?
*January 24, 2011*

**marketing**

what special advantages and potential problems did 3m have in introducing a new highlighter with flags product for college students in 2004
*January 24, 2011*

**math**

Explain how you could show five less than a number using an expression?
*January 10, 2011*

**Literature**

How do you think a Puritan writer such as Anne bradstreet might have responded to the ideas presented in a psalm of life
*December 14, 2010*

**history**

president hoover's overall plan to deal with the great depression was to?
*December 14, 2010*

**Physics**

forces of 185N and 245N act east and south respectively on an 80 kg mass.If the force of friction is ZERO , find the accleration of the mass.
*December 9, 2010*

**chemistry**

what is the molarity of an unknown HCI concentration if it requires 75ml of a 0.2 M NaOH solution?
*December 1, 2010*

**chemistry**

The environmental protection agency (EPA) wanted to study the particular materials in the atmosphere in Bogus Basin at 7200 ft elevation. The sampled air rate was at 1.00 liter per minute and was allowed to run 24 hours per day for 30 days. At the end of the month the filter ...
*December 1, 2010*

**Statistics**

0.999
*November 28, 2010*

**Baking**

I have a recipe for a Tunnel of SugarPlum cake. It calls for a small pky of frosting mix (Jiffy). This is no longer available here. I have researched other Tunnel recipes on the web. They also call for the frosting mix. HELP PLEASE. How and what can I substitute for this item?
*November 27, 2010*

**math**

If a single fair die is rolled, find the probability of a 4 given that the number rolled is odd.
*November 25, 2010*

**com/156**

what is the main point of process analysis in writing? Why are four basic steps of process analysis important? what happens if you skip a step?
*November 15, 2010*

**Physics**

An 8.74-kg block slides with an initial speed of 1.52 m/s down a ramp inclined at an angle of 27.0° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.64. Use energy conservation to find the distance the block slides before coming ...
*November 11, 2010*

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