Saturday
December 20, 2014

Posts by Eliz


Total # Posts: 39

Physics
Find the relationship among deta,mg, and qE.
January 30, 2014

Physics
A small 9g plastic ball is suspended by a 35 cm long string in a uniform electric field 1110 N/C as shown. The ball is in equilibrium when the string makes a 23 degree angle with the vertical.
January 30, 2014

Maths/ Calc
Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance. Recall that the height function is given by y(t)= ...
April 18, 2013

newcastle
calculate number of atoms of each element CaS04
September 27, 2012

Physics
The 3.0 -diameter water line in the figure splits into two 1.0 -diameter pipes. All pipes are circular and at the same elevation. At point A, the water speed is 2.0 and the gauge pressure is 50 .What is the gauge pressure at point B? I know we have to find P in kPa, but am ...
April 12, 2011

Physics
The 3.0 -diameter water line in the figure splits into two 1.0 -diameter pipes. All pipes are circular and at the same elevation. At point A, the water speed is 2.0 and the gauge pressure is 50 .What is the gauge pressure at point B? I know we have to find P in kPa, but am ...
April 12, 2011

Physics
I am stuck on this question and not really sure what to do for it. I think that i can use this equation Q/dt=e*sigma*A*T^4 for it, but i'm not getting the right answer for it. Is this not the right equation? Question: Electronics and inhabitants of the International Space ...
April 5, 2011

Reproduction
How does a glycoprotein stimulate genomic and metabolic change in a cell?
February 13, 2010

Statistics
An Experiment consists of flipping a fair coin once and rolling a fair die once. what is the probability of observing a hear or six?
February 10, 2010

Chemistry
if you had this complex ion [CoF6]^-3 would this ion absorb red or blue color and would you expect this complex to be high or low spin.
May 13, 2009

Chemistry
for the oxidation state of the Mn doesn't the NH3 have a charge. So OH is -1 and NH3 has a -1 charge plus 2 so its -2 or does it not have a charge
May 13, 2009

chemistry
Does the complex ion [Co(en)2Cl2]^+ have cis-trans geometric isomers?
May 13, 2009

Chemistry
I'm a little confused on what that means. does that mean that .4762 would be + 3x instead of X?
May 11, 2009

Chemistry
Question: you have .420 Litters of a solution containing Ag3PO4 (s) in equilibrium with its ions. write an algebraic equation which when solved will geive the molar concentration of Ag^+1 after the addition of .200 moles of Na3Po4(s) to the .420 liters of solution. in your ...
May 11, 2009

Chemistry
Question: if 10.0 mg of Mg(OH)2 is placed in 100 ml of pure water, will all of the sample dissolve before equilibrium can become established, or will some sample remain undissolved? i got the Molarity of Mg(OH)2 to be .00172 M. Where does that exactly go into the ice table. ...
May 11, 2009

Chemistry
Question: When 1.97 grams of Pb(OH)2(s) is added to 1.00 liter of pure water at 25 C a saturated solution (some solid is present) is formed that has a pH of 8.97. Compute the Ksp value for Pb(OH)2 using the data. How do i go about getting the Molarity from the grams given and ...
May 11, 2009

Chemistry
Question: The solubility of a salt in water increases if either ion of the salt undergoes hydrolysis. Comput the molar solubility of AgCN in water assuming no hydrolysis. B) compute the molar solubility of AnCN in water assuming hydrolysis occurs. The equation would be AgCN ...
May 6, 2009

Chemistry
Question: A certain sample of phosphate rock contains 26.26% P2O5. A .5428 gram sample is analyzed by percipitating MgNH4PO4*6H2O and heating it strongly to form Mg2P2O7. compute the mass of Mg2P2O7. I'm not entirly sure what to do. Do you set up an equation?
April 23, 2009

Chemistry
So far i got .118 mol of HCl than divided by 1000 which got me 1.18e-4 than i times that by .050 L =5.59E-6 moles. i than did the same thing for the H3PO4 and got for the final answer 1.82E-5. I'm confused on your meaning for than getting the concentration of the two. ...
April 19, 2009

Chemistry
Question: A volume of 26.00ml of 4.30 M. HCL is mixed with 33.70 ml of 10.80 M H3PO4 s mixture is diluted to 1.00 liter with distilled water. A 50.00 ml portion of this diluted mixture is than titrated with .2200 M. NaOH. a) compute the concentration of phosphoric acid after ...
April 19, 2009

Chemistry
Question: A 0.400 g sample of propionic acid was dissolved in water to give 50.00 mL of solution. This solution was titrated with 0.150 M NaOH. what was the pH of the solution when the equivalence point was reached? I'm not really sure how i would go about setting this up...
April 15, 2009

Chemistry
I am unsure exactly how to set up this calculation. From a graph that we got from getting different absorbances we took those points we got and got a equation for the best fit line. The equation was y = 760.8x + .02014 and the unknown absorbance equalled .254. We than wanted ...
April 5, 2009

Chemistry
Question: Chloroform, CHCl3, a volatile liquid was once used an anesthetic but has ben replaced by safer compounds. chloroform has a normal boiling point at 61.7 degree C and has a heat of vaporization of 31.4 kj/mol. compute its vapor pressure at 36.2 degree C? Is the ...
March 16, 2009

Chemistry
How do you determine what molecule will have the highest or lowest boiling points. example: if you had CH3F, N2H4, CH3OH and O2. how would you determine what is the highest boiling points? What do you look at?
March 16, 2009

Chemistry
Question: if you added ethylene glycol to your car's radiator to lower the freezing point to -31.0 degree C, what would the corresponding boiling point of the coolant in your radiator. The freezing point and boiling point constants for water are 1.86 and .510 degree C/m ...
March 16, 2009

Chemistry
Question: Suppose you have 557 ml of 0.0300M HCL and you want to make up a solution of HCL that has a pH of 1.831. What is the maximum volume (in liters) that you can make of this solution? I know that you can get the concentration of HCL using the pH given, but how do you ...
March 3, 2009

Chemistry
2.500g sample of a mixture of sodium carbonate and sodium chloride is dissolved in 25.00ml of 0.798M HCl. Some acid remains after the treatment of the sample. If 28.7 ml of 0.0108M NaOH were required to titrate the excess hydrochloric acid how many moles of sodium carbonate ...
March 3, 2009

Chemistry
Please check my work? I first changed Kp to Kc: .900atm(0.0821)(25+273.15)^(2.0 mol*1.0 mol)- (3.0)= 22.03 Than i did an ICE table. I than used the equation Kc= So2Cl2/So2*Cl2. 22.03=(.75+x)/(.5-x)(.25-x). I than solved for x. x=.169 was the only value that worked for x. I ...
March 1, 2009

Chemistry
How do you change Kp to Kc?
March 1, 2009

Chemistry
Question: Consider following equilibrium system: SO2(g)+ Cl2(g) goes to So2Cl2(g) Kp=.900 atm @25 degree C. Suppose that 2.0 moles S02, 1.0 moles Cl2, and 3.0 moles So2Cl2 are placed in an empty 4.00L vessel at 25 degree C. Compute teh number of grams of each substance present...
March 1, 2009

Chemistry
Question: Antimony (V) chloride, SbCl5, dissociates on heating to SbCl5(g)goes to SbCl3(g)+ Cl2(g). A closed 3.50 L vessel initially contains 0.0125 mol SbCl5. what is the total pressure at 248 degree's C when equilibrium is achieved? The value of Kc at 248 degree C is 2....
February 25, 2009

Chemistry- please check my work
I first changed the 3.59g of AgCl into moles and than divided by liters given to get .0200M of Agcl. I also changed the mol of H20 and LaCl3 to Molarity as well. I got .01M for LaCl3 and.02 for H20. Than I plugged into equation Kc=(.0200)/(.010)(.02). To give me the Kc value ...
February 25, 2009

Chemistry- please check my work
Question: The following equilibrium was studied by analyzing the equilibrium mixture for the amount of HCL produced. LaCl3(s)+ H2O(g) goes to LaOCl(s)+2HCl(g). A vessel whose volume was 1.25L was filled with 0.0125 mol of lanthanum (III)chloride and 0.0250 mol H2O. After the ...
February 25, 2009

Chemistry
Question: The equilibrium constant Kc for the equatino CS2(g)+ 4H2(g) goes to CH4(g)+2H2S(g) at 900 degree's C is 27.8. What is the value of Kc for the following equation 1/2CH4(g)+H2S(g)goes to 1/2 CS2(g)+ 2H2(g). I'm not sure what to do. the only thing i could think ...
February 25, 2009

chemistry-please help
I don't know how to find generic rates and how to find rate of production? Example: 2HgCl2+ C2O4 goes to 2Cl + 2CO2 + Hg2Cl2 Experiment 3: [HgCl2]=.052 [C204]=.300 the inital rate (M/min of Hg2Cl2) is 3.54E-5. What is the generic rate of the reaction and what is the rate ...
February 24, 2009

Chemistry
Question: the rate constant for the second order decomposition of NOBr(g) is .800 1 divided by MS at 10 degree's C. Suppose a 2.50 L beaker contains NOBr at a concentration at .0680 moles per liter. How much time does it take for 75.0 percent of the sample to decompose. I ...
February 23, 2009

Chemistry
How do you find rate of production of Cl? If you are given the inital rate to be 3.54e-5 and given measured data of .052[HgCl2] and .300[C204]? The equation is 2HgCl2(aq)+ C204(aq) goes to 2Cl+ 2Co2(g)+ Hg2Cl2(s). I thought that you may take the initial rate divided by the ...
February 23, 2009

Chemistry- please check my work
Compute the vapor pressure of water above a solution formed by dissolving 25.00 grams of magnesium sulfate, MgSO4 (MM=120.3) in 95.00 grams of water at 338K. The vapor pressure of pure water at 338K is 188.0 torr. I took 95.00g H20 divided by 18.0g. which gave me moles for top...
February 23, 2009

native american history
Discuss the divisions between the traditionalists and moderate Indians from WWII on. Why does this war help to produce a sharp division between them? How did the actions of the government fully deepen it? -Can someone give me a website that will help me find these answers for ...
September 12, 2007

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