Wednesday
May 25, 2016

# Posts by Andrew

Total # Posts: 1,118

AP Chemistry
2K (s) + 2H2O (l) --> 2KOH (aq) + H2 (g) When 0.400 mole of potassium reacts with excess water at STP, what is the volume of hydrogen gas produced? the answer is 4.48 liters but I keep getting wrong numbers! please help! Thanks!
October 2, 2008

AP Chemistry
since PV=nRT PV/nRT = 1 or did you mean PV=nRT? P is pressure in atm and V is volume in liter and n is # of moles and R is 0.08206 and T is tempurature in Kelvin.
October 2, 2008

i still dont get bob help!!!!!!!!!!
September 30, 2008

the sum of two numbers is 34. their difference is 18. what are the two numbers?
September 30, 2008

chemistry
Assume that the entire mass of an atom is concentrated in its nucleus, a sphere of a radius 1.5 x 10 to the -5 pm. If the mass of the atom is 2.39 x 10 to the -22 g, what is the density?
September 29, 2008

math
i think you divide 500 by 6
September 29, 2008

if a letter has a line on it does it mean its a long or short
September 29, 2008

chemistry
what is the total pressure of a gas mixture that contains hydrogen at 0.45atm nitrogen at 0.25 atm and argon at 0.60 atm
September 29, 2008

Okay look: 00-01-\$7586 01-02-\$8022 02-03-\$8502 03-04-\$9249 04-05-\$9877 Jason started college during the 2001-2002 year and graduated during the 04-05 year. How much did Jason's education cost? How do you do it????
September 26, 2008

social studies
thank you just wat i needed
September 25, 2008

social studies
i mean, i wanted a picture of the net
September 25, 2008

social studies
Can you find some links to a site that has a picture of a northwest indian fishing
September 25, 2008

Psychology
I have a pretty specific question... I'm wondering if the "Binge-Eating Disorder" is actually included in the DSM 4 as one of the disorders, or if it's just in there for one of future considerations.
September 25, 2008

artist
its just like a hobby. Some people like it some don't.
September 23, 2008

math
one difference between identity,zero, commutatiive and associative property
September 22, 2008

625 thousands
September 22, 2008

Chemistry
What volume of 3.0M Na2SO4 must be added to 25ml of 1.0M BaCl2 to produce 5.0g of BaSO4? The answer is 7.1ml but I don't get it very well. I thought I could use mole ratio of the balanced equation, but it did not work. Thanks a lot!
September 19, 2008

writing
I have to write a narrative essay about a time when i had to do something that went against my beliefs or convictions. I thought about it for like an hour, but I can't figure out a decent example. Can anyone tell me an example so I can understant what kind of topic would ...
September 17, 2008

September 11, 2008

math
simplify and evaluate where g=3 (2g-1)^2-2g+g^2
September 10, 2008

25 25 out of 5 is 5 because 25divided by 5 is 6. 5x5 is 25.
September 9, 2008

English
I have a problem with 'diction' I kind of 'feel' the sentence, but I don't know what to write. Thanks a lot!! "Art is the antidote that can call us back from the edge of numbness, restoring the ability to feel for another." By using the word "...
September 9, 2008

science
September 8, 2008

English
I'm learing about connotations of words. Although many words have connotations that most of us agree to because they are culturally shared, some worlds cna be given a different connotation in some contexts. However, since I am a ballingual student, I'm having a hard ...
September 7, 2008

Social Studies
Is there another famous person named John Deere. I can only find the John Deere that invented tractors.
June 17, 2008

social studies for the 3rd time
thANK YOU :)
June 11, 2008

social studies for the 3rd time
I need something that s related to California that starts with a Q
June 11, 2008

social studies(again)
i need a word about california that starts with a P
June 11, 2008

social studies ABC california book
thanks a lot:)
June 11, 2008

social studies ABC california book
and try not to do counties,I already did too many of them
June 11, 2008

social studies ABC california book
I cant find a thing that has to do with California that starts with a O (the letter) please help thank you
June 11, 2008

social studies
thank you
June 10, 2008

social studies
California
June 10, 2008

social studies
im working on a social studies weird ABC thing, but I can't find anything for U. please help
June 10, 2008

social studies
thanks a lot, but tht guy didn't found the McD food chain. he just made it more popular.
June 9, 2008

social studies
what has to do with Califoria that starts with a k
June 9, 2008

social studies
June 9, 2008

social studies
I. thank you
June 9, 2008

social studies
Can you find something about California that starts with a I?
June 9, 2008

electrochemistry
I said that Hg2Cl2 acted as both the anode and cathode?
June 3, 2008

electrochemistry
What is the anode and cathode of this problem? A chemist wishes to determine the concentration of CrO4-2 ions electrochemically. A cell is constructed consisting of saturated calomel electrode (SCE) and a silver wire coated with Ag2CrO4. The SCE is composed of mercury in ...
June 3, 2008

chemistry
which orbitals in the molecular orbital diagram contain the lone pair electrons around O? My answer: one of the lone pairs on oxygen exist in an "s" orbital. two of the lone pairs exist in "p" orbitals not involved in bonding. -is this correct.
May 28, 2008

Statistics
In a certain microwave oven on the high power setting, the time it takes a randomly chosen kernel of popcorn to pop is normally distributed with a mean of 140 seconds and a standard deviation of 25 seconds. What percentage of the kernels will fail to pop if the popcorn is ...
May 12, 2008

The local lottery sets up a game wherein a player has a chance of collecting \$750. The player must choose a 3-digit number and if it matches, the player receives \$750 It costs \$1 to play the game. What is the expected profit (or loss) for each player.
April 27, 2008

Stats
The local lottery sets up a game wherein a player has a chance of collecting \$750. The player must choose a 3-digit number and if it matches, the player receives \$750 It costs \$1 to play the game. What is the expected profit (or loss) for each player. PLEASE ANSWER ASAP...
April 27, 2008

Statistics
The local lottery sets up a game wherein a player has a chance of collecting \$750. The player must choose a 3-digit number and if it matches, the player receives \$750 It costs \$1 to play the game. What is the expected profit (or loss) for each player.
April 27, 2008

Statistics
Use the standard normal distribution to find P(-2.25 < z < 1.25).
April 27, 2008

Math Help Needed
I need to figure out a pattern (using an algebraic expression) that will get me from: 1 to .01, 2 to .02, 3 to .04, 4 to .08, etc. all the way to 25 to 153,948.16! HELP
April 14, 2008

Math
I need to figure out a pattern (using an algebraic expression) that will get me from: 1 to .01, 2 to .02, 3 to .04, 4 to .08, etc. all the way to 25 to 153,948.16! HELP
April 13, 2008

College Calculus (Binomial Series)
Expand f(x) = (x+x^2)/((1-x)^3) as a power series and use it to find the sum of series (SUM from n=1 to infinity) (n^2)/(2^n) PLEASE HELP.
April 8, 2008

physics
dont know if its correct but its something. p=w/t W=KE=(1/2)m(v)^2 p=(.5mv^2)/t p_inital=(.5(1600)(19.5))/11=27654watts p_final=(.5(1600)(3.2))/11=744.7...watts (p_final)-(p_inital)=26909.27...watts maybe? idk
April 3, 2008

Chemistry
When installed in the year 1,985, a cobalt-60 radiation therapy source (k = 0.131 yr-1) produced a beam capable of delivering 323 rem per minute (a unit to describe the beam intensity). What is the beam intensity (in rem/min) in the year 2007?
March 25, 2008

language arts
Which of the following sentences has a dangling modifier? A. On the way to the bank, the interest rates went down. B. By the light of the moon, I tripped over a rock. C. The dog that is man's best friend is cat's worst enemy. D. When the storm began to abate, we went ...
March 17, 2008

college calculus
evaulate an intergral for length of curve with y=(sqrt(4-x^2)) and 0 <_ x <_ 2 im lost, i think i know how to apply the formula but its so difficult to integrate and i need to show all my work!
March 10, 2008

Chemistry
What is the molarity of the resulting saline solution when you mix 1 mole HCl with 1 mole NaOH? I'll provide some basic information that I know, but could somebody tell me how to get the answer using the data? The balanced reaction is as follows: HCl+NaOH->H2O+NaCl ...
March 8, 2008

Algebraic Functions
but guido, if that is your real name, wait a sec how do u divide a trinomial by a binomial
February 11, 2008

math
I need help with my homework
February 4, 2008

statistics
For a sample with a mean of M=85, a score of X=90 corresponds to a z-score of z=1.00. What is the sample standard deviation?
February 4, 2008

physical education
what exercise is done to strenghten the gastronemuis? is it toe raies?
January 23, 2008

For DrBob222
I'm not surprised the answer was wrong. Chemical reactions are by mols and not by grams; therefore, 1 mol of each reactant produces 1 mol of each product but a mol is not a gram. SO, convert 0.5839 g KHC2O4 to mols, convert mols KHC2O4 to mols KOH (that's the 1:1 part...
January 9, 2008

Chemistry
A sample of KHC2O4 weighing 0.5839 g is dissolved in 25 mL of water and an endpoint is reached when 31.99 mL of KOH has been added. Calculate the molarity of the KOH solution. KHC2O4(aq) + KOH(aq) ¨ K2C2O4(aq) + H2O(l) because the coefficents are all the same, i just...
January 9, 2008

Chemistry
Hydrogen cyanide is a weak acid with Ka = 4.9 x 10-10. Calculate the pH of a solution (to 2 decimal places) containing 2.28 g of Sr(CN)2 per 158 mL.
January 7, 2008

math
December 17, 2007

math
which is the smallest unit of measurement? m, cs, km?
December 17, 2007

math
why is it good to play cards in a grave yard
December 16, 2007

geometry
a right traingle has legs of lengths 3 centimeters and 5 centimeters. Use the pythagorean theorem to find the area of a square drwan on the hypotenuse of the triangle.
December 13, 2007

Chemistry
Can someone tell me why N2^2+ is a diamagnetic molecule based on MO theory and diagrams? I get a bond order of 2, which is paramagnetic.
December 4, 2007

Chemistry
Calculate the mass in g of aniline (C6H5NH2, Kb = 4.3 x 10-10) that must be added to 1.4 x 102 mL of 0.24 M (C6H5NH3)Cl solution in order to generate a buffer solution of pH 5.56. Give your answer to 2 significant figures. Noclue...
November 24, 2007

Chemistry
Determine the pH of a solution that is prepared by mixing 100.0 mL of 0.125 M NaOH with 145 mL of 0.125 M CH3COOH (pKa = 4.75). Report your answer to 2 decimal places. Please help, I have no clue!!
November 23, 2007

Chemistry
how would i find the pH of this? 1.0 M NH3 (Kb = 1.8 x 10-5)
November 23, 2007

math
find each product,5/11x2/7 = or 2/9x4/8=
November 20, 2007

homework hlep
Hi, can you help me with my homework?
November 11, 2007

Science
Ok so I have to use kinematic equations to solve these. But I make like a X and Y chart Ex...X|Vix=2.89 dx=? t=? Y|Viy=0 dy=3.7 and so forth. 1. A cliff diver strikes the water 10.3 meters from a cliff 25 meteres high. At what horizontal speed did he leave the cliff? 2. A ball...
October 28, 2007

social studies
How do you learn about people who lived long ago?
September 26, 2007

math-algebra
the answer Red then blue the red is D. 1 of 38 or 2.63% chance 5 red chances /20 balls * 9 blue /19 * 4 red balls left /18 = .25 X .47368 * .2222 = .0263 or 1/38
September 26, 2007

english
September 19, 2007

Fashion Design
What is the Number one and two mostly used art programs by fashion designers? after making the drawings in these art programs, how do the freelancers get their designs onto different clothing and material and mass produce it.. What are the steps that are usually taken. Here is...
June 20, 2007

physics- density
An air mattress is 2.1 m long, 0.55 m wide, and 13 cm deep. If the air mattress itself has a mass of 0.22 kg, what is the maximum mass it can support in fresh water? I know that I can find the volume and area, and the density of water. But I cannot find an equation to find the...
June 19, 2007

Research Paper: jack london/call of the wild
Hi. I need some good sources to use. Lots of them. I'll explain I need to write a 6 page research paper on Jack London and the book "The Call of the Wild" (yes both), using only things told to me from sources. Here's another thing: I can't plagiarize any ...
May 9, 2007

Spanish
Our teacher gave us this quote "the one who got away" and we are supposed to figure out what it means. If anyone in the class does the entire class gets to go to our local Mexican restaurant for lunch!! Please help! It is pretty obvious what it means, in English. It ...
April 21, 2007

social studies
April 18, 2007

Sports
Good website on Pat Tillman. Know doing on Pat instead of football. http://en.wikipedia.org/wiki/Pat_Tillman If this is a report for school, here are some suggested topics: The use of illegal drugs in professional sports. The effect of sports finances on Universities The ...
March 30, 2007

Sports
Can you name the six quarterbacks taken in the first round of the 1983 NFL draft and the order in which they were selected? We are a homework help service, helping students who are stuck with homework. If this is homework,I recommend you get your parents involved and change ...
March 30, 2007

Spanish Essay: Looking for Corrections
Hello. Just wondering if anyone could look this over for me and make any corrections. It'd be really appreciated. I've never been a good writer in Spanish, and it's this once-a-quarter essay projects that cause me trouble. Thanks in advance for any help! Gracias...
March 17, 2007

The concentric circles, or growth rings, represent the cross-section of a tree with a diameter of 16 centimeters. The width of the outer tree ring measures 2 centimeters. What is the area in square centimeters of the outer ring of the cross-section of the tree? Use 3.14 for p....
February 22, 2007

The concentric circles, or growth rings, represent the cross-section of a tree with a diameter of 16 centimeters. The width of the outer tree ring measures 2 centimeters. What is the area in square centimeters of the outer ring of the cross-section of the tree? Use 3.14 for p....
February 22, 2007

Health Project Ideas
February 6, 2007

Manuscript Speech
How do I write a Manuscript speech on an article? What should it look like? Any examples? Check this site for a lot of information about writing a manuscript speech. http://www.shkaminski.com/Classes/Handouts/ms_spch.htm Thank you for using the Jiskha Homework Help Forum again...
January 28, 2007

PLEASE FINISH HELPING ME.. I asked experts to answer you. I am not a person who is a expert on writing format. The issue of cover sheet, etc has to be clarified by the teacher. Generally, teachers specify a style guide and format issues. There is no right answer to these ...
January 28, 2007

Manuscript on an Article (bobpursley)
Posted by bobpursley on Saturday, January 27, 2007 at 8:56pm in response to English (Speech). Read the article. What did it say? What was it point of view? Was the author complete in the analysis? What needs to be done? How did it make you feel? So in the paper, describe the ...
January 28, 2007

English (Speech)
I have to write a manuscript on an article. How do I do this. I looked online, and I found this " Each manuscript should contain a separate cover sheet with the manuscript title, the authors’ names, their degrees, affiliations and complete mailing addresses and phone...
January 28, 2007

English (Speech)
I was told to write a Manuscript on an article. How exactly do I write this thing? how do i get started? Can someone please provide me with an example. Read the article. What did it say? What was it point of view? Was the author complete in the analysis? What needs to be done...
January 27, 2007

antiderivatives
i need the antiderivative of 2x/x^2 thanks. Two x over x squared? Reduce it to 2/x the integral of 1/x is ln x.
January 18, 2007

antiderivatives
i need the antiderivative of sinxcosx dx for intergral pie/2 to 0 thanks. sin(x)cos(x)dx = sin(x)d[sin(x)] = 1/2d[sin^2(x)]
January 18, 2007

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