Tuesday
September 30, 2014

Posts by rafael


Total # Posts: 32

Math
You are from CMU, huh ;)
June 1, 2014

physics
you and your friend are riding on a helicopter that is traveling west at a speed of 10 meters per second. You throw a baseball with a velocity of 2 meters per second north, straight across the inside of the helicopter to your friend on the other side. What is the velocity of ...
February 23, 2014

AP Chemistry i need help!
A 21.5997 g sample of impure magnesium carbonate was heated to complete decomposition according to the equation MgCO3(s) → MgO(s) + CO2(g). After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of 15.5207 g. ...
September 4, 2012

AP Chemistry
For the reaction ? C6H6 + ? O2 ↽⇀? CO2 + ? H2O a maximum of ? moles of CO2 could be formed from 6.38 mol of C6H6 and 6.03 mol of O2. Answer in units of mol
September 4, 2012

AP Chemistry
For the reaction ? C6H6 + ? O2 ↽⇀? CO2 + ? H2O a maximum of ? moles of CO2 could be formed from 6.38 mol of C6H6 and 6.03 mol of O2. Answer in units of mol
September 4, 2012

AP Chemistry
The reaction of 8.7 grams of fluorine with excess chlorine produced 3.9 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %
September 4, 2012

AP Chemistry
The reaction of 8.7 grams of fluorine with excess chlorine produced 3.9 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %
September 3, 2012

AP Chemistry
For the reaction 3 FeCl2 + 2 Na3PO4 → Fe3(PO4)2 + 6 NaCl , what is the maximum amount of Fe3(PO4)2 which could be formed from 11.26 g of FeCl2 and 13.34 g of Na3PO4?
September 3, 2012

AP Chemistry
A 7.6 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12.9 g. What was the mass of iron in the sample of ore? Answer in units of g
September 3, 2012

Chemistry Homework
If 0.8000 g of a mineral yields 0.2400 g of NaCl + KCl, and this mixture contains 58.00% of Cl, what is the percentage of Na2O and K2O in the mineral?
January 16, 2012

math
Mary's age is 2/3 that of peter's. two years ago mary's age was 1/2 of what peter's age will be in 5 years tim. how old is peter now?
November 15, 2011

Physicss
a car brakes to a halt in 5 seconds. The position of the car versus time is given by: x = 10t - t^2 a) What is the average speed between 0 s. and 4 s.? Thank you
September 20, 2011

Math
why
September 20, 2011

Physics
a car brakes to a halt in 5 seconds. The position of the car versus time is given by: x = 10t - t^2 a) What is the average speed between 0 s. and 4 s.?
September 20, 2011

AP Chem
how is the 51 gram sample integrated into the equation then? or is it not used at all in this case?
August 24, 2011

Fashion
(x to the second power-3x+2)and (5x to the second power-3x-8)= Show all work
January 8, 2011

math
write a expression for each model
October 20, 2010

Imagery
Shakira
March 12, 2010

Physics
There is an error in the form for question (d) vf = sqrt [2*(K.E)/M]
February 18, 2010

chemistry
Which of the following minor products could not arise from the halogenation reaction below? isobutane + Br2 ----> 1-bromo-2-methyl propane + HBr + minor products a)2,5 dimethylhexane b)2 bromo-2 methyl propane c)1,3 dibromo, 2 methyl propane d) 2,4 dimethylhexane e)2,2,5 ...
January 24, 2010

chemistry
this is the reaction...sorry about that :) isobutane + Br2 ----> 1-bromo-2-methyl propane + HBr + minor products
January 24, 2010

chemistry
Which of the following minor products could not arise from the halogenation reaction below? a)2,5 dimethylhexane b)2 bromo-2 methyl propane c)1,3 dibromo, 2 methyl propane d) 2,4 dimethylhexane e)2,2,5 trimethyl pentane plz can someone help me...i kno its not b) or c) but im ...
January 24, 2010

accounting
what is the function of the securites and exchange commission
December 29, 2009

accounting
accounting what groups consistently offer opinions about proposed fasb statement
December 29, 2009

cci
It is stand accounting procedures, or GAAP, to make an adjusting entry to remove the current year’s principle
December 28, 2009

cci
It is stand accounting procedures, or GAAP, to make an adjusting entry to remove the current year’s principle from the long-term liabilities. This entry reduces the long-term liabilities and increases the current liabilities. You are the bookkeeper for Biker’s ...
December 26, 2009

cci
Malissa is an accountant. Sometimes printouts of financial statements have errors and are not usable. Malissa doesn't like to waste anything, so she takes the unusable financial statements to her son's day care center to use for drawing paper. Explain why you think ...
December 26, 2009

us history
yea
November 12, 2009

world history
what set the stage for vietnamese resistance againts the french?
June 12, 2009

Philosophy
Philosophy of religion is the philosophical examination of the central themes and concepts involved in religious traditions. It involves all the main areas of philosophy: metaphysics, epistemology, logic, ethics and value theory, the philosophy of language, philosophy of ...
January 21, 2008

Chemistry
How do I determine the formula of a conjugate acid. Ex. question: Give the formula of the conjugate acid of each of the following. (a) NH2- (b) HPO42- (c) NO3- Add a H^+ to each of the bases listed. The conjugate acid of the acetate ion, CH3COO^- is CH3COOH.
April 2, 2007

Chemistry
A buffer containing 1.2169 M of acid, HA, and 0.1431 M of its conjugate base, A-, has a pH of 3.96. What is the pH after 0.0017 mol NaOH is added to 0.5000 L of this solution? I can't figure this out for the life of me, i'm sure its just some simple mistake i'm ...
April 2, 2007

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