Given the following chemical reaction: Zn+HCl-->ZnCl2+H2(g) If you measured the total volume of collected gas over water at 20 degrees celcius t be 428ml at a total pressure of 845 torr, how many milliliters of 2.6M HCl would be required to produce the correct amount of ...
December 4, 2010
Given the following reaction: Pd(NO3)2+CaSO4-->PdSO4+Ca(NO3)2 If you started with 225.6ml of 6.32M CaSO4 and the percent yield of this reaction was ol 78.2%, what is the actual yield of grams mod of PdSO4?
December 4, 2010
A compound is composed of 19.998% carbon, 3.331% hydrogen, 23.320% nitrogen, and 53.302% Oxygen. Its molar ass is 120.07 gram/mole. What are the empirical and molecular formulas?
December 3, 2010
Mr. Miller says, Plan on a quarter pound of hamburger per person." There are 21 people in the class, including Mr. Miller and us." How much money should be collected for the cost of each burger in each student? if Hamburger Meat: $1.49 per pound ( limit: 5 pounds per...
December 2, 2010
Atlantis is a small, isolated island in the South Atlantic. The inhabitants grow potatoes and catch fresh fish. The accompanying table shows the maimum annual output combinations of potatoes and fish that can be produced. Obviously, given their limited resources and available ...
August 3, 2010
Kenny wants to get to the pool 25 minutes before the pool opens. It takes him 20 minutes to drive, and 15 minutes to pack up. At what time should he start packing up if the pool opens at 5:30 p.m.?
December 3, 2009
find the value of y so that the line passing through the two points has the given slope. 1. (6,y), (3,3). m=2/3 2. (8,y), (2,-3). m=1/2 I know the formula: y2-y1/m2-m1 and I've been trying to do this for a long time now, but I still don't get it. please help. thanks!
October 5, 2009
write the equation in slope-intercept form. then graph the equation. 1. 6x-4y=3 2. 2y+5x=10 can you please help me with at least one of them? thanks! also, where it says 'then graph the equation', I know we can't graph here, so you can ignore that. but if you know ...
October 3, 2009
in 1992, a software company had a profit of $30,000,000. in 1998, the company had a profit of $210,000,000. find the average rate of change of the company's proft in dollars per year. I have no idea how to this. please explain step-by-step.. thnxx
October 3, 2009
find the x-intercept of the graph of the equation: 1. 4x-5y=8 2. 3y-10x=4 answers that I got: 1. x=2 2. -2/5 ___________________________________ find the y-intercept of the graph of the equation: 3. 7-12x=3y 4. 4y+9=5x my answer: 3. 2 1/3 4. 2 1/4 can you pleae check if they...
October 3, 2009
The United States emitted 19.5 million t of nitrogen oxides (NO) into the atmosphere in 1987. One metric ton (1 t) equals 1,000 kg. How many kilograms of NO were emitted to the atmosphere in the United States during 1987?
August 12, 2009
How many hours would a person have to jump rope in order to lose 1 pound? If a person uses 750 cal/h. A person needs to burn off 3,500 calories more than he or she takes in to lose 1 pound. I need to know how to set up the problem and I can figure out the answer.
August 7, 2009
Jim signed a new deal for $10 million with the Toronto maple leafs. THe terms of the contract were 1 million immediately and 800,000 per year for the next 5 years (first payment after 1 year) and $1 million per year for the next 5 years (first payment at year 6). If jim's ...
January 24, 2009
Hi there, can you see if i have translated the english djibouti anthem correctly into French. Djibouti National Anthem Arise with strength; for we have raised our flag, The flag which has cost us dear With extremes of thirst and pain. Our flag, whose colours are the ...
January 17, 2009
A cytology student believes he has identified an individual suffering from monoploidy. The instructor dismisses the claim. Why was the claim dismissed? What type of cells were being viewed.
March 9, 2008
Hey John I don't think it's a joke. (really) The country I am sad to say is really like DUMB (sorry to say that) Your not the only one. But if I tell any teacher that they would be like so mad! So many people are proud of the country! at least one American is smart ...
November 7, 2007
Math -- Statistic types used in public speaking
This is actually in my communications class. I have to decide which is the best statistic type is best to use in my speech. (mean, median or mode) I am struggling to decide which statistic would be used to support the following assertions? Louisianas educational system ...
October 6, 2007
Which were the roles of elderly people in mesopotamy,egypt,greece or rome? Here are previous answers to this question. Please read through as many as possible. http://www.jiskha.com/search/search.cgi?query=elderly =)
April 20, 2007
How elderly people lived in ancient Rome and Greece? About 5 percent of ancient Rome's population was over age 65. Considering that Rome's population was about one million in 5 B.C., about 50,000 of the people were over age 65. Sources: http://www.utexas.edu/depts/...
January 14, 2007
An advertisement for a pineapple drink claims taht the drink contains 15%pineapple juice. How much pure pineapple juice would have to be added to 8 quarts of the drink to obtain a mixture containing 50% pineapple juice? Let's look at how much pineapple is in it now. 8 ...
December 14, 2006
An advertisement for a pineapple drink claims taht the drink contains 15%pineapple juice. How much pure pineapple juice would have to be added to 8 quarts of the drink to obtain a mixture containing 50% pineapple juice? This is a mixture problem. Pineapple drink + pure juice...
December 14, 2006
social studies (elderly people)
How third age people live in America, Africa and Asia, which is the different roles they play in different societies. (I am 11 years old) It's difficult to generalize about the roles of the elderly in such large continents. In general, Asian senior citizens tend to be ...
December 10, 2006
if current theory predicts global warming what do you think might be contributing to temporary global cooling?how could this happen? http://en.wikipedia.org/wiki/Global_cooling Global cooling is a myth, at least as for as mainstream science is concerned.
October 17, 2006
MW:CH4N2O(Urea) 60g/mole x 245/1000000 x .100L = .00147g urea. So weigh out .00147g urea and mix it with water in a volumetric flask up to exactly 100mL. Since 1ppm =1mg/1kg or 1/1000000
June 27, 2006