jude
Most popular questions and responses by jude
chemistry
Hydrogen iodide decomposes according to the reaction 2HI(g)H2(g) + I2(g) A sealed 1.50 L container initially holds .00623 moles of H2, .00414 moles of I2, and .0244 moles of HI at 703K. When equilibrium constant is reached, the concentration of H2(g) is
asked on September 29, 2015 
Math
An oblique triangle is inscribed in a circle. If one side of the triangle having a length of 10 cm and the angle subtended to that side is 20. Determine the area of the circle.
asked on May 11, 2017 
Chemistry
Why would an alcohol/water mixure not freeze at constant temperature.
asked on February 23, 2011 
Chemistry
S2O82(aq) + 2I(aq) > 2SO42(aq) + I2(aq) (I) Rate = k [S2O82]x [I]y Rate1 = k [S2O82]x [I]y ƒ´ [S2O82ƒ{] Rate = ƒ{ƒn  ƒ´ƒnt Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M
asked on March 8, 2011 
Chemistry
What is the concentration of Ni2+ in 0.0775M Ni(NO3)2 and 1.3981M NH3
asked on April 17, 2011 
Chemistry
The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the molarity of KBr in the solution.
asked on October 10, 2010 
Chemistry
When 24.0g og glucose(a nonelectrolyte) are dissolved in 500g of water, the solution has a freezing point of 0.47C. What is the molar mass of glucose according to yhe data?Kf of water is 1.86C/m.
asked on October 10, 2010 
physics
describe the force board experiment to show how to obtain the resultant of two nonparallel coplanar force acting at a point.four forces of magnitude 10N, 5N, 4N, AND 6N acts on an oblect in the direction north. West, east and south respectively.find the
asked on July 27, 2011 
chemistry
Consider the hypothetical elements X and Y. Suppose the enthalpy of formation for the compound XY is 336 kJ/mol, the bond energy for X2 is 414 kJ/mol, and the bond energy for Y2 is 159 kJ/mol. Estimate the XY bond energy in units of kJ/mol.
asked on December 13, 2010 
math
suppose you won a contest at the start of 5th grade that deposited $3000 in an account that pays 5% annual interest compounded continuously. how much will you have in the account when you enter high school 4 years later? round to nearest dollar how much
asked on March 7, 2013 
math
The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA.
asked on February 15, 2015 
Chemistry
What is the mole fraction of methanol CH3OH, in the vapor phase from a solution consisting of a mixture of methanol and propanol CH3CH2CH2OH at 40celsius, if the total pressure above the solution is 131 torr? The vapor pressures of methanol and propanolare
asked on April 23, 2011 
Chemistry
Reposting since it wasn't clear in the previous post S2O82(aq) + 2I(aq) > 2SO42(aq) + I2(aq) (I) Rate = k [S2O82]x [I]y Rate1 = k [S2O82]x [I]y Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M
asked on March 8, 2011 
algebra
The sum of the three numbers in Arithmetic Progression is 33. If the numbers are increased by 2, 1, and 6 respectively the new numbers will be in Geometric progression. Find these numbers.
asked on April 10, 2017 
Chemistry
What is the mole fraction of benzene C6H6 in the VAPOR PHASE from a solution consisting of a mixture of benzene and nhexame ch3(ch2)4ch3 at 27celsius, if the total pressure above the solution is 135.2 torr? The vapor pressures of benzene and nhexame at
asked on April 24, 2011 
Chemistry
What is the vapor pressure in Torr above a solution prepared by mixing 66.73g of benzene C6H6 with 63.26g toluene C6H5CH3 at 20 Celsius. The vapor pressure of pure benzene and toluene at 20celsius are 75 and 22 torr respectively. These compounds form
asked on April 23, 2011 
Chemistry
The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the %w/v of KBr in the solution?
asked on October 10, 2010 
Chemistry
At 1473K the equilibrium constant for the reaction H2(g) + Cl2(g) 2HCl(g) Kc = 2.5*10^4. What would be the equilibrium concentration of HCL if the initial concentrations of H2 and Cl2 were 0.1840M and 0.1918M. I got 29.7 but was told it was wrong
asked on March 12, 2011 
Chemistry
How many grams of carbon tetrachloride CCL4 must be mixed with 35.96g of ethyl acetate CH3COOCH2CH3 at 50? celsius to produce a solution with a vapor pressure above the solution of 291.8 torr. The vapor pressure of pure carbon tetrachloride and ethyl
asked on February 20, 2011 
Math
A computer is reduced by 15% in a sale. The original price is £560. Calculate the sale price
asked on November 5, 2015 
math help
The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA. I think it's under triangle bisector theorem. Help me answer this guys. Thanks.
asked on February 15, 2015 
math
Without adding, how do you know the sum of 36.179 and 8.63 will have a 9 in the thousandths place?
asked on February 2, 2015 
College Chemistry
A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The
asked on May 5, 2011 
College Chemistry
How many grams of Al would be deposited from an aqueous solution of Al3+ with a current of 1.430A after 5hrs of deposition.
asked on May 3, 2011 
Chemistry
A buffer was made by mixing 0.1522 moles of HCO2H with 0.1832 moles LiHCO2 and diluting to exactly 1L. What will be the pH after addition of 10ml of 0.3657M NaOH to 50mL of the buffer. Ka(HCO2H) = 1.8*104
asked on April 16, 2011 
Chemistry
Metal cations can act as lewis acids in water to produce an acidic solution even though the metal ion contains no hydrogen. Water hydrates the ions in solution and partial loss of electrons from water allows hydrogen ion to be lost What is the pH of a
asked on April 16, 2011 
Chemistry
What is the mole fraction of methyl nbutyrate CH3(Ch2)2COOCH3 in the vapor phase of a solution consisting of? a mixture of methyl nbutyrate and ethyl acetate CH3COOCH2CH3 at 50 Celsius if the total pressure above the solution is 192.5 torr. The vapor
asked on February 20, 2011 
Chemistry! Please Help!
What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! J
asked on February 12, 2009 
College Chemistry
I think this should be easy but im stuck. Please help: Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was
asked on May 1, 2011 
Chemistry
How many grams of glycerin C3H8O3 must be dissolved in 375.9g of water at 100 degrees Celsius to reduce the pressure of water above the solution to 714.6mmHg. The solution is a nonvolatile compound
asked on April 23, 2011 
Chemistry
How many moles of NaOBr must be mixed with 0.1788 mole of HOBr and diluted to 1L to prepare a solution having a pH of 8.7043. Ka of HOBr = 2.0 * 109
asked on April 16, 2011 
Chemistry
How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations. Havent been taught this yet so a step by step walkthrough would
asked on May 5, 2011 
Chemistry
Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174e9J/K I used S= klnW and got lnW = 5.92e14. How do i
asked on April 30, 2011 
Chemistry
Calculate the[OH] of a solution of 0.1861M CH3CH2CH2NH3CL if Kb= 5.1*104 for CH3CH2CH2NH2
asked on April 16, 2011 
physics
Given a square of sidelength a = 5 cm. We place a charged particle at each corner, three of them carry + 2 nC of charge and one carries the same amount of negative charge. What is the magnitude of the electric field at the center of the square? I don't
asked on February 6, 2010 
Math
You have $30 to spend on picking 25 pounds of two different types of fruit at a farm. The apples cost $1.40 per pound the blueberries cost $.90 per pound and the cherries cost $1.10 per pound. You want prices many pounds of apples as the other two fruits
asked on April 10, 2016 
math help
The perimeter of triangle RXA is 39, PX=4 and AP=9.Find RX and RA. P is at the middle. I think it's under triangle bisector theorem. Help me answer this guys. Thanks
asked on February 18, 2015 
chemistry
Can the half cell electrochemistry experiment using a pH meter and aqueous solutions of Cu, Cu2+ and Ag and Ag+ be used to measure even lower concentrations, such as 10^23 mol of Cu2+ or a single free copper ion in solution? Please explain.
asked on May 5, 2011 
College Chemistry
If the voltage of the cell is 0.1288V at 25Celsius when [Pb2+]=0.1403M and the pressure of H2=1atm, what is the pH Pb(s)+2H+(aq) Pb2+(aq) +H2(g) E0 = 0.1260V
asked on May 3, 2011 
Chemistry
The free energy change for the dissolution of cuco3 at 25celsius is 56.246KJ/mol. What is the solubility of this compound. I used delta G/RT = lnKsp but the answer i got was wrong.
asked on April 30, 2011 
Chemistry
The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF SOLUTE. Tried all solutions
asked on April 24, 2011 
Chemistry
What must be the concentration of F to just start precipitation of SrF2 from a solution which is 1.202*105M i Sr(NO3)2? Ksp = 2.900*109
asked on April 17, 2011 
Chemistry
I did an experiment using 20ml of 0.1M acetic acid and added 8ml of 0.1M NaOH. pH obtained after adding NaOH was 5.2. How do i calculate the mols of NaOH that reacted? mols of acetate formed, acetic acid initially present and acetic acid unreacted. Also
asked on April 7, 2011 
physics
In a hydrogen atom, if the radius of the orbit of the electron is doubled, then its energy will ... a)Decrease by a factor of 2 b)Remain the same c)Increase by a factor of 2 d)Actually, it is not possible for the radius of the orbit to double e)Increase or
asked on April 4, 2010 
physics
If i take the inverse of a value, what happens to its uncertainty? For example, if I have C +/ deltC and then i do 1/C. What happens to delta C? Thank you
asked on March 22, 2010 
Chemistry!! Please Help!
What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! J
asked on February 12, 2009 
Medical Transcription
A fact was constricted, appropriate, congruent. Speech was coherent, normal rate, rhythm, and volume. Thought process was goal directed. No looseness of associations or flight of ideas. Thought content showed he denied auditory or visual hallucinations.
asked on January 23, 2017 
MATHS
The+sum+of+two+numbers+is+30+six+less+than+twice+the+smaller+number+is+equal+to+the+number+x+find+the+larger+number Please give me the answer
asked on July 15, 2016 
Math help
The perimeter of triangle RXA is 39, PX=49 and AP=9.Find RX and RA. P is at the middle. I think it's under triangle bisector theorem. Help me answer this guys. Thanks
asked on February 18, 2015 
math
write in words and in expanded form in two ways fractional and exponential 1.) 3.5968 2.)325.19217 3.)47.813
asked on June 23, 2014 
math
I am a decimal between 2 and 3. The digit in my thousandths place is the sum of the digits in my tenths and hundredths place. The digit in my tenths place is the difference of the digits in my thousandths and hundredths place. The digit in my hundreths
asked on June 18, 2014 
Math
In a group of quarters and nickels, there are four more nickels than quarters. How many nickels and quarters are the if the coins are worth $2.30? Plsmshow the solution, thanks
asked on September 24, 2013 
Pre algebra
A number multiplied by itself and then by itself again gives 1,000. What is the number? Please show the solution step by step
asked on September 24, 2013 
Minoxidil
So, I'm doing a research project for my chemistry class, and one of the parts that I have to answer is the chemical reaction of the substance that I'm researching. But there's a problem. I've searched every single website regarding minoxidil, but I cannot
asked on May 28, 2012 
Chemistry
What must be the concentration of F to just start precipitation of SrF2 from a solution which is 1.202*105M i Sr(NO3)2? Ksp = 2.900*109
asked on April 17, 2011 
Chemistry
What is the solubility of Ca(OH)2 at a pH of 4.802 Ksp of Ca(OH)2 = 6.500*106
asked on April 17, 2011 
Chemistry
The vapor pressure of pure water at 85 celsius is normally 433.6 mmHg but decrease to 393.8mmHg upon addition? of an unknown amount of ammoniu chloride NH4Cl to 162.2g of water at this temperature. How many grams of ammonium chloride were added assuming
asked on February 20, 2011 
Chemistry
At what initial concentration would a solution of acetic acid (ka=1.8x10^5) be 2% ionized? I am stuck. Thanks J
asked on February 12, 2009 
Chemistry!!
At what initial concentration would a solution of acetic acid (ka=1.8x10^5) be 2% ionized? THANKS! J
asked on February 12, 2009 
english
who is the eponymous hero in the books written by kevin crossleyholland This site will tell you about the book trilogy and give you the name of the hero. http://en.wikipedia.org/wiki/The_Seeing_Stone
asked on January 12, 2007 
Algebra
a vendor sold 100 fresh chicken eggs. eight of them were sold at a profit of 30% while the rest were sold at a loss of 40%. what is the percentage gain or loss on the whole stock?
asked on May 4, 2017 
ALGEBRA
SOLVE FOR THE VARIABLE 9/2m  6 = 3 1/2 + 4m nine halves m minus 6 = negative 3 and a half + 4m thank you
asked on January 6, 2016 
physics
the bob of a simple pendulum has a mass of 0.03kg.determine the weight of the bob
asked on July 25, 2015 
math
4% on 185000 is what?
asked on February 22, 2015 
Math
A certain bacteria doubles the number of its cells every 20 minutes. A scientist puts 50 Cells in a culture disk. How many cells will be in the culture disk in 2 hours?
asked on September 24, 2013 
psychology
need psy 302 help anybody out there?
asked on August 27, 2013 
physics
A roller coaster travels 101 ft at an angle of 56.8 above the horizontal. How far does it move horizontally?
asked on September 14, 2012 
College Chemistry
How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s
asked on May 5, 2011 
Chemistry
What would Qc be if the volume of the container increased by a factor of 1.604 for this reaction SO2+Cl2 SO2CL2 kc = 12.821 at 373K
asked on April 23, 2011 
Biology
The trachea is ___________ to the lungs Toes are _______________to the shoulders Esophagus is _____________ to trachea Pinna is ______________ to tail Liver is ______________ to stomach Options are Anterior, Posterior, dorsal, ventral, lateral, median,
asked on March 1, 2011 
Chemistry
Which of the following will have the smallest freezing point depression? 0.1158 m NaF 0.1158 m Na2SO4 0.1158 m K2SO4 0.1158 m Fe(NO3)3
asked on February 20, 2011 
physics
Which is true as one gets closer to the center of the earth? a. The person’s weight increases b. The person’s weight decreases c. The person’s weight remains the same d. The person’s mass changes e. A new dimension is discovered
asked on May 6, 2010 
physics
An ultrasonic beam reflects off a tumor in an organ at an angle of 50 with a shift L = 7 cm. If the speed of the wave is 26 % less in the organ than in the medium above, determine the depth of the tumor below the organ's surface
asked on March 29, 2010

MATHS
The denominator of a fraction exceedsby 3. If the numerator is decreased by 1 and the denominator is increased by 3, the value of the resulting fraction is 1/2. What is the denominator and numerator? Please give me the answer in detail form thanks
posted on July 15, 2016 
area perimeter
12 and 2 a= l x w 12 x2 = 24 perimeter add all sides 12+ 12 +2 +2 = 28
posted on January 6, 2016 
math
Sir steve help me answer my post please.
posted on February 19, 2015 
math
33/×=6/4 cross multiply 33×4=132 6××=6× 132÷6=22 22=×
posted on November 24, 2014 
Chemistry
v
posted on August 8, 2014 
math
(3x10)+(5x9)
posted on June 23, 2014 
math
456736
posted on June 23, 2014 
math
2.134
posted on June 18, 2014 
math
No we can' t divide 23 and 4
posted on February 23, 2013 
4th grade Math Help
No because 23 divide equal 69
posted on February 23, 2013 
Chemistry
189 he?
posted on February 18, 2013 
Chemistry
Thank you so much DrBob222
posted on May 6, 2011 
Chemistry
Thank you so much DrBob222
posted on May 6, 2011 
Chemistry
Thank you so much DrBob222. You are the best
posted on May 6, 2011 
College Chemistry
I tried this but was told the answer was wrong.
posted on May 6, 2011 
Chemistry
Can anyone help me with this question? Thanks
posted on May 6, 2011 
College Chemistry
Thank you DrBob222
posted on May 5, 2011 
College Chemistry
W = 2ⁿ , where n = number of molecules lnW = n • ln2 = 5.921 × 10¹⁴ ⇒ n = 8.542 × 10¹⁴ molecules
posted on May 1, 2011 
Chemistry
I figured it out. Had to find the molar solubility so square root of Ksp. Thanks
posted on April 30, 2011 
Chemistry
Thank you DrBob222.
posted on April 23, 2011 
Chemistry
12.821*1.604
posted on April 23, 2011 
Chemistry
2.9*109/1.202*105 and find the square root of the number = 0.0155
posted on April 17, 2011 
Chemistry
2.9*109/1.202*105 and find the square root of the number = 0.0155
posted on April 17, 2011 
Chemistry
5.0*10^8= 0.0775/0.9331^6x x= 2.35e10
posted on April 17, 2011 
Chemistry
ignore f's in the question
posted on March 8, 2011