Sunday
December 21, 2014

Posts by Jo


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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