Thursday

April 24, 2014

April 24, 2014

Number of results: 1,390

**Inorganic chemistry**

Consider the half-reactions: Cu^2+(aq) +2e^- ==> Cu(s) E naught = +0.34V Sn^2+(aq) + 2e^- ==> Sn E naught = -0.14V Fe^2+ + 2e^- ==> Fe(s) E naught = -0.44V Al^3+(aq) = 3e^- ==> Al(s) E naught = -1.66V Mg^2+(aq) = 2e^- ==> Mg(s) E naught = -2.37V Which metals or ...
*Saturday, April 11, 2009 at 10:54pm by Steve*

**biochemistry**

Calculate the delta G naught prime f (free energy of formation) of the following compounds at 25 degrees celsius. ethyl acetate (ethyl acetate + H2O <=> ethanol + acetate- + H): delta G naught prime =-19.7 kj/mol); the pka of acetic acid is 4.76) Free Energies for: H2O...
*Sunday, September 8, 2013 at 11:28pm by meraki*

**Inorganic chemistry**

E naught cell for the following galvanic cell is +0.254V Hg2^2(aq)+2I^-(aq) ==> 2 Hg(l) + I2(s) What is delta G naught for this reaction? Delat G naught = -nFEnaught n = the number of moles of electrons transferred between oxidizing and reducing agents as determine by the ...
*Tuesday, April 14, 2009 at 3:51pm by Steve*

**Chemistry**

Under the appropriate conditions, NO forms NO2 and N2O: 3NO(g) <--> N2O(g) + NO2(g) Use the values for delta G naught for the following reactions to calculate the value of Kp for the above reaction at 500.0 C 2NO(g) + O2(g) <--> 2NO(g) delta g=-69.7 kJ 2N2O(g) <...
*Monday, November 5, 2012 at 11:50am by Victoria *

**Inorganic chemistry**

Calculate E naught cell for the reaction b 5Cd(s) + 2MnO4-(aq) + 16H+(aq) ==> 5Cd^2+(aq) = 2Mn^2+(aq) + 8H2O(l) given the following standard reduction potentials MnO4^-(aq) + 8H^+(aq) = 5e^- ==> Mn^2+(aq) + 4 H2O(l) E naught = +1.52V Cd^2+(aq) + 2e^- ==> Cd(s) E ...
*Saturday, April 11, 2009 at 11:01pm by Steve*

**Inorganic chemistry**

Calulate E naught cell for the reaction below 5 Cd(s) + 2 MnO4^-(aq) + 16H+(aq)+ 2 Mn2+(aq) + 8 HxsO(l) The oxidation anode must be 5Cd(s) ==> 5Cd2+(aq) +10e^- The reduction cathode must be 2MnO4^- + 16H2^=(aq) + 10e^- ==> 2Mn2+(aq) + 8H2O E naught cell = E naught ...
*Tuesday, April 14, 2009 at 2:22pm by Steve*

**chemistry**

Under the appropriate conditions, NO forms NO2 and N2O: 3NO(g) <--> N2O(g) + NO2(g) Use the values for delta G naught for the following reactions to calculate the value of Kp for the above reaction at 500.0 C 2NO(g) + O2(g) <--> 2NO(g) delta g=-69.7 kJ 2N2O(g) <...
*Monday, November 5, 2012 at 1:00pm by Victoria *

**Inorganic chemistry**

Given the following two half-reactions, determine which overall reaction is spontaneous and calculate its standard cell potential. Cd^2+(aq) + 2e^- ==> Cd(s) E naught = -1.21V Sn^2+ + 2e^- ==Sn(s) E naught = -0.14V
*Saturday, April 11, 2009 at 10:26pm by Steve*

**Inorganic chemistry**

E naught cell for the following galvanic cell is +0.254V. Hg^2+(aq) + 2I^-(aq) ==> 2 Hg(l) +I2(s) What is the change G naught for this reaction?
*Saturday, April 11, 2009 at 11:18pm by Steve*

**Inorganic chemistry**

Given the following standard reduction potentials, Fe^2+(aq) = 2e^- ==> Fe(s) E naught = -0.440V FeS(s) + 2e^- ==> Fe(s) + S^2-(aq) E naught = -1.010V determine the Ksp for FeS(s) at 25 degress Celsius
*Saturday, April 11, 2009 at 11:21pm by Steve*

**Chemistry**

Please explain. The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1 C2H2+2H2---->C2H6 Delta H 2 Which expression represents the enthalpy change for the reaction below? C2H4+H2---->C2H6 Delta H = ? A. Delta H 1 + ...
*Monday, November 11, 2013 at 5:29pm by Anonymous*

**CHEMISTRY**

Please explain. The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1 C2H2+2H2---->C2H6 Delta H 2 Which expression represents the enthalpy change for the reaction below? C2H4+H2---->C2H6 Delta H = ? A. Delta H 1 + Delta...
*Monday, November 11, 2013 at 6:39pm by Anonymous*

**Chemistry(Please check answers)**

1) For a reaction delta Go is more negative than delta Ho. What does this mean? a. delta So is zero. b. delta So is negative c. delta So is positive d. delta So is negative if delta Ho is positive. e. delta So is negative if delta Ho is negative. I think that delta S is ...
*Monday, April 23, 2012 at 1:29pm by Hannah*

**Physics**

A plane drops a hamper of medical supplies from a height of 5210 m during a practice run over the ocean. The plane’s horizontal velocity was 133 m/s at the instant the hamper was dropped. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the overall velocity ...
*Monday, September 6, 2010 at 2:01pm by John*

**Chemistry**

Clapeyron equation: dp/dT = ΔS / ΔV My textbook says, for fusion/melting reactions: dp/dT = ΔH / (T ΔV) this implies that T * ΔS = ΔH. I know T * ΔS = q and at constant pressure, that equals H, but the dp/dT reaction is not at constant...
*Wednesday, March 11, 2009 at 12:59pm by reed*

**Calculus-Solved - Incorrect**

calculate delta y for f(x)= x^(3/2) with x= 4 and delta x= dx=0.1 delta y= f(x+delta x)- f(x) = f(4.1) - f(4) delta y= f(4.1)-8 f(x + delta x)= 8 + 3/2*x^(1/2)*0.1 = 8 + 0.15x^(1/2) = 8 + 0.30 = 8.30 delta y= 8.30 - 8 delta y= 0.30 but this is wrong. why is it wrong?
*Saturday, May 4, 2013 at 6:58pm by Alaina*

**Chemistry(DrBob222)**

So, i did this lab, a solubility and thermodynamics lab of KNO3, and in it we had to determine the delta h delta g and delta s, the question i have is what is the relationship of the signs delta h, delta s, and delta g, to the dissociation of the salt and the temperature ...
*Monday, December 9, 2013 at 7:24pm by K*

**math**

Compute delta(y) and dy for the given values of x and dx=delta(x) y=x^2 , x=8 , delta(x)=0.5 Delta(y)= ??? dy = ??? I got dy=8 by doing: dy= (f prime of x)dx dy=2xdx dy=2xdelta(x) dy=2*8*0.5 dy=8 but I have not clue how to find delta(y) please help! deltay = y(x+deltax)- y(x...
*Saturday, April 14, 2007 at 1:50pm by Julia*

**Chem**

For the reaction I2(s)+Cl2(g) ==> 2ICl(g) delta H= 36kJ, delta S= 158.8J/K at 25° C. Calculate the temperature at which Keq is 4.0*10^3. delta G= (delta H)- T(delta S) = 36 - (298)(0.1588) = -11.32 delta G= -RTlnK -11.32= -8.31Tln(4*10^3) -11.32= -6892.35 T T= .00164 > ...
*Monday, August 10, 2009 at 10:18pm by ---*

**Physics**

1. If the change in position delta(x) is related to velocity v (w/ units of m/s) in the equation delta(x)=Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 2. If a is acceleration (m/s^2), delta(v) is change in velocity (m/s), delta(x) is change in position (m...
*Saturday, August 29, 2009 at 2:48pm by anonymous*

**Inorganic chemistry**

I'm going to need some help getting this problem started Calculate E for the following electrochemial cell at 25 degrees Celsius Pt(s) ! Sn^2+(aq, 0.50M), Sn^4+(aq, 0.50Mz0 !! I^-(aq, 0.15M) ! AgI(s) !Ag(s) given the following standard reduction potentials AgI(s) + e^- ==> ...
*Tuesday, April 14, 2009 at 5:23pm by Steve*

**chemistry**

For a particular reaction delta G is more negative than delta H. This means that a. delta S is zero. b. deltaS is negative c. delta S is positive d. delta S is negative if delta H is positive. e. delta S is negative if delta H is negative. i thought it was c?
*Saturday, April 21, 2012 at 11:54am by CHRIS*

**Inorganic chemistry**

Calc1ulate E for the following electrochemical cell at 25 degrees Celsius Pt(s) ! Sn^2+ (aq, 0.50M), S^4+(aq, 0.50M !!I^-(aq, 0.15M) ! AgI(s) ! Ag(s)! given the following standard reduction potentials. AgI(s) = e^- ==> Ag(s) + I^-(aq) E naught = -0.15V Sn^4+(aq) + 2e^- ==&...
*Saturday, April 11, 2009 at 11:09pm by Steve*

**Chemistry**

2M +6HCl–>2MCl+3H2 Delta H= -638.0 Kj HClg—>HCl aq= Delta H -74.8 Kj H2+Cl2–>2HCl Delta H -1845.0 Kj MCl3s–> MCl3 aq Delta H -249.0 Kj Use the information above to determine the enthalpy of the following reaction. 2M +3Cl2–>2MCl3 Delta H =???
*Friday, March 22, 2013 at 7:52pm by Raul*

**Valid statements**

Determine which statement follows validly from the statements included. 1) If Delta is an alpha, then Delta is a beta. If Delta is a theta, then Delta is a beta. Either Delta is an alpha or Delta is a theta. Therefore, Delta is ... 2)Either Delta is an alpha or Delta is a beta...
*Wednesday, October 12, 2011 at 9:54pm by AL 92*

**Physics**

Sorry, I asked this question earlier but I didn't clarify it well: A plane drops a hamper of medical supplies from a height of 5210 m during a practice run over the ocean. The plane’s horizontal velocity was 133 m/s at the instant the hamper was dropped. The acceleration of ...
*Monday, September 6, 2010 at 6:35pm by John*

**CHEMISTRY**

I know I posted this question before, but can you clarify it?? MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE ENTHALPY IS NEGATIVE.... BUT THAT DOES NOT MAKE SENSE BECAUSE THE CHANGE IN ENTHALPY OF THE ORIGINAL DELTA H1 IS NEGATIVE(ACCORDING TO THE ...
*Thursday, November 14, 2013 at 6:43pm by Anonymous*

**Chemistry**

I know I posted this question before, but can you clarify it?? MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE ENTHALPY IS NEGATIVE.... BUT THAT DOES NOT MAKE SENSE BECAUSE THE CHANGE IN ENTHALPY OF THE ORIGINAL DELTA H1 IS NEGATIVE(ACCORDING TO THE ...
*Thursday, November 14, 2013 at 7:32pm by Anonymous*

**Chem**

Does my work here look right? 3. One mole of an ideal gas expands adiabatically into a vacuum. Calculate q, delta-e, w, and delta-H for the process. q= 0 [adiabatic] w= -Pext(V2-V1) w= 0 delta-e = w + q delta-e = 0 + 0 = 0 delta-h= delta-e + P(delta V) delta-h= 0 + 0 = 0 does ...
*Saturday, February 3, 2007 at 8:37pm by Jess*

**chemistry**

what is the difference between these two equation: delta G= delta H-T(delta S) and deltaG(knot)=delta H(knot)-T(delta S knot) Which G do i use to tell whether the reaction is spontaneous
*Sunday, October 17, 2010 at 3:05am by nighter*

**chemistry**

what is the difference between these two equation: delta G= delta H-T(delta S) and deltaG(knot)=delta H(knot)-T(delta S knot) Which G do i use to tell whether the reaction is spontaneous
*Sunday, October 17, 2010 at 5:50pm by nighter*

**chemistry**

Is delta Tf = delta Tb? The original practice problem is Detla Tf= 8.631 for an aqueous solution, what is delta Tb. I know that Delta Tf=Kf*m
*Thursday, February 28, 2008 at 3:04pm by Sarah*

**Chemistry**

Calculate the DELTA H(rxn), DELTA S(rxn), DELTA S(universe), DELTA G(rxn). For each system below indicate whether DELTA S and DELTA H are positive or negative. Then indicate if the reaction is entropy driven, enthalpy driven or neither. C3H8(g) + 2O2(g) => 3CO2(g) + 4H2O(g)
*Friday, September 19, 2008 at 1:43am by Zach*

**Chemistry**

for the reaction of hydrogen with iodine H2(g) + I2(g) --> 2HI(g) relate the rate of disappearance of hydrogen gas to the rate of formation of hydrogen iodide. and my answer is: rate formation of HI= delta [HI]/delta t and the rate of reaction of I2 = delta [I2]/ delta t to...
*Sunday, February 17, 2008 at 4:27pm by Lauren*

**Chemistry(Please check)**

Delta G^o for a reaction can be calculated from? 1. delta G^o f data 2. Delta H^o f and delta S data 3. equilibrium constants I chose that delta G can be calculated from H and S values. Would you agree?
*Sunday, April 22, 2012 at 11:46pm by Hannah*

**Chemistry**

How do I find the equilibrium constant for 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g) at 825 degrees celcius, assuming that delta H and delta S knot do not depend on temperature, and Delta H is -908 KJ and Delta S is 1206 KJ?
*Sunday, September 25, 2011 at 7:26pm by Summer*

**Inorganic chemistry**

Given the following standard reduction potentials, Fe^2+(aq) + 2e^- ==> Fe(s) E naught = -o.440V FeS(s) + 2e^- ==> Fe(s) + s^2-(aq) E naught = -1.010V determine the Ksp for FeS(s) at 25 degrees Celsius Fe(s) ==> Fe^2+ + 2e^- (oxidation) FeS(s) + 2E^- ==> Fe(s) + S^...
*Tuesday, April 14, 2009 at 5:06pm by Steve*

**Chemistry**

I am having trouble with this equation and calculating the enthalpy of formation. 2 NaHCO3 (s) --> Na2CO3 (s) + H2O (g) + CO2 (g) delta H129.2kj I get as far as this step and then I don’t know what to do next. delta H= [1*delta H (Na2CO3) + 1* delta H(H2O (g)) + 1* delta H(...
*Tuesday, April 30, 2013 at 9:27pm by Laura*

**Chemistry**

The following standard free energies are given for 25 degrees celcius. 1) N2(g) + 3H2(g)-> 2NH3(g) delta g = -33.0 kJ 2) 4NH3(g) + 5O2(g)-> 4NO(g) + 6H20() delta g = -1010.5 kJ 3) N2(g) + o2(g)-> 2NO(g) delta g = 173.1kJ 4) N2(g) + 2O2(g) -> 2NO2(g) delta g = 102.6...
*Wednesday, July 6, 2011 at 1:13pm by K*

**Chemistry**

For the reaction described by the chemical equation: 3C2H2(g) -> C6H6(l) .. Delta H rxn = -633.1 kJ/mol a) Calculate the value of Delta S rxn at 25.0 C... b) Calculate Delta G rxn... c) In which direction is the reaction, as written, spontaneous at 25 C and 1 bar pressure...
*Friday, March 9, 2012 at 1:42pm by Katherine*

**Chem 2**

for the evaporation of water during perspiration on a hot dry day 1.delta H is greater than zero and Tdelta S is equal to Delta H 2.delta H is greater than zero and Tdelta S is gretaer than Delta H 3.delta H is greater than zero and Tdelta S is less than Delta H 4.delta H is ...
*Sunday, April 29, 2007 at 4:00pm by ok*

**Chemistry**

delta T = ikfm delta T is the amount f.p. is lowered. i is the number of particles; i.e., Na3PO4 will have i = 4 (3 for Na and 1 for PO4). m is molality. k is a constant and need not enter into the calculations. Arrange the following solutions in order of decreasing freezing ...
*Sunday, January 21, 2007 at 9:50pm by DrBob222*

**Chemistry**

Is the following reaction spontaneous at 25*C? delta s reaction = -217 J/K*mol delta H rxn = -1202 KJ 2Mg (s) + O2 (g) -> 2MgO (s) delta suniverse = delta s system - delta H system / T i got positive (+) 3.81 x 10 ^ 3 J/K and my notes says it is spontaneous but i feel like ...
*Wednesday, June 8, 2011 at 10:40pm by ChemLover*

**CHEMISTRY**

calculate the delta h for the reaction 2C+2H--> C2H4 C+O2--> Co2 delta h= -393.5 C2H4+ 3O2--> 2CO2+ 2H2O delta h= 1410.9 H2+ 1/2 O2--> H2O delta h= -285.8 2CO+ O2--> 2CO2 delta h= -566.0 do you flip the first two equations and times the first and third one by 2?
*Sunday, June 6, 2010 at 10:05pm by Anonymous*

**chemistry**

use the following data, as appropriate, to estimate the molarity of a saturated aqueous solution of Sr(IO3)2. Molarity of a saturated aqueous solution of Sr(IO3)2 Sr(IO3)2(s) delt h kJ/mol=-1019.2 delta G kJ/mol=-855.1 delta S= 234 J mol-1K-1 Sr^2+(aq) delta h= -545.8 kJ/mol ...
*Sunday, December 2, 2012 at 12:34am by Allyx3*

**chemistry**

use the following data, as appropriate, to estimate the molarity of a saturated aqueous solution of Sr(IO3)2. Molarity of a saturated aqueous solution of Sr(IO3)2 Sr(IO3)2(s) delt h kJ/mol=-1019.2 delta G kJ/mol=-855.1 delta S= 234 J mol-1K-1 Sr^2+(aq) delta h= -545.8 kJ/mol ...
*Sunday, December 2, 2012 at 11:09am by Allyx3*

**CALCULUS help please**

Find the following limit where f(x) = 4x^2 − 3x. limit-->(f(x+ delta x)-f(x))/(delta x) delta x **delta x means the triangle symbol with x next to it***
*Monday, September 26, 2011 at 10:31pm by kunti*

**equibrium - help!**

Consider the reaction CO(g) + H2O(g) <--> CO2(g) + H2(g) Use the appropriate tables to calculate a) delta-G*f at 552*C b) K at 552*C I'm pretty sure I have a good idea of how to do this: I believe I can use Gibbs-Helmholtz equation to account for the temperatures... ...
*Sunday, April 15, 2007 at 12:26pm by Daniel*

**calculus**

correct me if I'm wrong please. 1. What is the value of Lim 2x+3/4x-5 when x>00 (infinity?) a.-3/5 b.0 c.1/2 <.. my answer d.1 2. An object moves according to the law s = t^2 + 5t - 8. What is the average rate of change of s with respect to t in the interval t to (t + ...
*Sunday, February 6, 2011 at 3:58pm by Anonymous*

**Chemistry(Please help)**

delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol) I am having trouble converting the units for delta H and delta s to match. I multiplied delta H by 1000 to get kJ but this didnt give me the correct answer.
*Wednesday, April 25, 2012 at 6:47pm by Hannah*

**chemistry**

consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi
*Wednesday, November 20, 2013 at 9:10pm by Jessica*

**Chemistry**

2CH3CH2CH2OH(l)+9O2(g)→6CO2(g)+8H2O(g) I have to find the delta G delta G of CH3CH2CH2OH(l)=−360.5 KJ/Mol delta G of O2(g)=0 KJ/Mol delta G of CO2(g)=−394.4 KJ/Mol delta G of H20(g)=−228.6 KJ/Mol I keep getting -3426.2 KJ/Mol but its not correct.
*Friday, June 21, 2013 at 1:44pm by dave*

**chem!**

Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour. how would I go about and do this question? What are you studying? Do you know how to use the thermodynamic tables (delta Ho, etc). delta Hrxn = delta ...
*Monday, May 14, 2007 at 4:06pm by Chem*

**chem**

calculate the delta Hf of c6h12o6 (s) from the following data: Delta H combustion= -2816 kj/mol delta Hf of Co2 = -393.5 kj/mol delta Hf= of H2 O= -285.9kj/mol
*Sunday, March 4, 2012 at 9:20pm by Cece*

**Physics**

A particle moves in the xy plane with constant acceleration. At time zero, the particle is at x = 4.5 m, y = 6.5 m, and has velocity v(naught) = (6.5 m/s)i-hat + (−2.5 m/s)j-hat (arrow for v(naught) points toward positive x direction). The acceleration is given by a = (6...
*Monday, September 6, 2010 at 12:54pm by John*

**Chemistry II**

Saw this one already answered, but did not understand at all... Calculate the delta Hf of C6H12O6 (s) from the following data: Delta H combustion= -2816 kj/mol delta Hf of Co2 = -393.5 kj/mol delta Hf= of H2 O= -285.9kj/mol
*Sunday, March 3, 2013 at 8:44pm by Scooby*

**chemistry**

divide eq 2 by 2: 2H(g)........> H2(g) delta H= -104.2Kcal H(g) ........> 1/2 H2(g) delta H= -72.1Kcal Now reverse the reaction: 1/2H2(g).......>H(g) delta H=+72.1Kcal subtract this eq from eq 1 1/2H(g)+1/2I2(g).....>HI(g) delta H=-1.1kcal +-1/2H2(g)......>+-H(g...
*Sunday, November 28, 2010 at 6:37am by Anonymous*

**Chemistry**

Which of the following reactions are spontaneous (favorable)? A] 2Mg(s) + O2(g) -> 2MgO(s) Delta G = -1137 kJ/mol .. B] NH3(g) + HCl(g) -> NH4Cl(s) Delta G = -91.1 kJ/mol ... C] AgCl(s) -> Ag+(aq) + Cl-(aq) Delta G = 55.6 kJ/mol .. D] 2H2(g) + O2(g) -> 2H2O(g) ...
*Thursday, March 8, 2012 at 10:34pm by Kat*

**Chemistry **

The molar solubility of lead iodide is 1.45*10^-3M at 20 degrees C and 6.5*10^-3M at 80 degrees C . What are the values of delta H not and delta S not for dissolution of PbI2 ? PbI2(s) ---> Pb2+(aq) + 2I- (aq) You may assume that delta H and delta S are independent of ...
*Saturday, November 20, 2010 at 8:06pm by Tal*

**Physics**

A particle moves in the xy plane with constant acceleration. At time zero, the particle is at x = 4.5 m, y = 6.5 m, and has velocity v(naught) = (6.5 m/s)i-hat + (−2.5 m/s)j-hat (arrow for v(naught) points toward positive x direction). The acceleration is given by a = (6...
*Monday, September 6, 2010 at 2:46pm by John*

**Chemistry**

HELP! :) Consider the following reaction: 3A to 2B The average rate of appearance of B is given by deltaB divided by delta t. Comparing the rate of appearance of B and the rate of disappearance of A, we get Delta B divided by Delta t= ___* (-delta A divided by delta t) Thanks!
*Thursday, May 24, 2012 at 9:29am by Mel*

**Physics **

(delta)Eg = -14.7J Therefore, Ek = -(delta)Eg = 14.7J I don't understand how you'd come to the above conclusion? Does Ek just always equal -(delta)Eg?
*Friday, June 21, 2013 at 12:15am by a Canadian*

**Chem**

I need to figure out Delta H, Delta S, and Delta G for the following problem. H2+F2 Yeilds 2HF the temperature is at 298K
*Saturday, June 18, 2011 at 1:35am by Stacy*

**calculus**

limit as delta x approaches 0 when f(x) = 4/ sqr x Have to use the (F(x+delta x)-f(x))/delta x method
*Friday, August 31, 2012 at 11:42am by kale *

**Chemistry**

Estimate the temperature where Delta G = 0 for the following reaction (Given: Delta H=-176 and Delta S = -284.5 J/K NH3 + HCl --> NH4Cl
*Wednesday, May 1, 2013 at 8:41pm by ramire2*

**Calculus-Solved-Why is this wrong?**

use differentials to approximate the change in f(x) if x changes from 3 to 3.01 and f(x) = (3x^2-26)^10 derivative: 10(3x^2-26)^9 f(x+ delta x)= 1 + 10(3x^2-26)^9 * 0.01 = 1 + 10(0.01) <-- Substitute 3 for x = 1 + 0.1 = 1.1 delta y= 1.1 - 1 delta y= 0.1 but 0.1 is incorrect...
*Saturday, May 4, 2013 at 6:53pm by Alaina*

**Chemistry**

1)Which thermochemical equation and data does not agree with the other two written? a) 2NO (g)+ O2 (g) ->2 NO2 (g) deltaH=-169.8 b) NO (g) + 1/2 O2 (g) -> NO2 (g) delta H = -56.6 c) 4 NO2 (g) -> 4 NO (g) + 2 O2 (g) delta H = +226.4 d)all three equations are in ...
*Sunday, January 22, 2012 at 7:22pm by Rick*

**Chemistry**

BrO-3 + 5Br- + 6H+ ---> 3Br2 + 3H2O the value of - delta[BrO3]/delta T= 1.5x10^-2M/s at a particular time what is the value of -delta [Br-]/Delta t at the same instant? 13 M/s 7.5x10^-2 1.5x10^-2 3.0x10^-2 330 M/s
*Monday, February 25, 2008 at 10:09pm by drew*

**calculus**

Find f(x+ (delta)x)- f(x) --------------------- (delta)x if f(x)=8x(squared)+ 1 This is so confusing! What is all the delta x stuff?
*Thursday, September 18, 2008 at 12:34am by Kim*

**Chemistry**

To obtain the rate of the reaction 3I-(aq) + H3AsO4(aq) + 2H+(aq) --> I3-(aq) + H3AsO3(aq) + H2O (l) I got that the rate is 1/3 delta [I-]/ delta t = delta [H3AsO4]/ delta t is this correct
*Sunday, February 17, 2008 at 4:24pm by Lauren*

**Chemistry**

To obtain the rate of the reaction 3I-(aq) + H3AsO4(aq) + 2H+(aq) --> I3-(aq) + H3AsO3(aq) + H2O (l) I got that the rate is 1/3 delta [I-]/ delta t = delta [H3AsO4]/ delta t is this correct
*Sunday, February 17, 2008 at 6:46pm by Lauren*

**Chemistry**

To obtain the rate of the reaction 3I-(aq) + H3AsO4(aq) + 2H+(aq) --> I3-(aq) + H3AsO3(aq) + H2O (l) I got that the rate is 1/3 delta [I-]/ delta t = delta [H3AsO4]/ delta t is this correct
*Monday, February 18, 2008 at 12:27pm by Lauren*

**Chemistry**

To obtain the rate of the reaction 3I-(aq) + H3AsO4(aq) + 2H+(aq) --> I3-(aq) + H3AsO3(aq) + H2O (l) I got that the rate is 1/3 delta [I-]/ delta t = delta [H3AsO4]/ delta t is this correct
*Monday, February 18, 2008 at 8:54pm by Lauren*

**Chemistry**

Calculate the enthalpy of the reaction 2B2H6 + 6O2=2B2O3 +6H2O given the following pertinent information: A. B2O3(s) + 2H2) )g) = 3O2 (g) + B2H6 (g), delta H= +2035kJ B. 2B (s) + 3H2 (g) =B2H6 (g), delta H= +36 kJ C. H2 (g) + 1/2)2 (g) =H2O (l), delta H=-285 D. H2O (l) = H2O (...
*Sunday, April 22, 2012 at 3:27am by B*

**chemistry 101**

Calculate (delta) H rxn for 2NOCl(g)---- N2(g) + O2(g) + Cl(g) given the following set of reactions: 1/2N2(g) + 1/2O2(g)-----NO(g) delta H =90.3kJ NO(g) + 1/2Cl2(g)----NOCl(g) delta H = -38.6 kJ
*Tuesday, October 27, 2009 at 8:45pm by Kaylyn*

**Chemistry for Eng.**

Select the delta H values associated with the dissolution of lithium chloride that are exothermic. delta H1: energy associated with the separation of water molecules delta H2: energy associated with the separation of ions delta H3: energy associated with the formation of water...
*Thursday, November 1, 2012 at 12:48am by Anonymous*

**Chemistry(Please help)**

1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is 2 NOCl (g) -> 2 NO (g) + Cl2 (g) at 227oC Using delta Ho = 81.2 kJ and delta So = 128 J/K, calculate the value of the equilibrium constant for this reaction. I do not know how to start this problem...
*Tuesday, April 24, 2012 at 11:35am by Hannah*

**Chemistry**

Given the thermodynamic data in the table below, calculate the equilibrium constant for the reaction: 2SO2(g)+O2--> 2SO3 Substance (DeltaH^o) (Delat S^o) SO2 -297 249 O2 0 205 SO3 -395 256 Answer (it was given) 2.32x10^24 Even though the answer is given (2.32x10^24) I just ...
*Sunday, March 16, 2008 at 12:00am by Sara*

**Chemistry**

Given the thermodynamic data in the table below, calculate the equilibrium constant for the reaction: 2SO2(g)+O2--> 2SO3 Substance (DeltaH^o) (Delat S^o) SO2 -297 249 O2 0 205 SO3 -395 256 Answer (it was given) 2.32x10^24 Even though the answer is given (2.32x10^24) I just ...
*Sunday, March 16, 2008 at 10:23pm by Sara*

**chemistry**

consider the following changes at constant temperature & pressure H2O(s) --yields-- H20(l); Delta H1 H2O(l) --yields-- H2O(g); Delta H2 H2O(g) --yields-- H2O(s); Delta H3 Using Hess's law, the sum of the deltas is a. equal to 0 b. sometimes greater than zero, sometimes less ...
*Wednesday, November 14, 2012 at 9:24pm by marcus *

**chmistry**

3O2(g)---> 2O3(g) Delta H = +284.6 kJ what is the sign of delta G and delta S
*Tuesday, February 5, 2013 at 12:04pm by bb*

**Chemistry**

I need to calculate the value of Kp at 25 degrees celsius using the delta Go value. Delta Go = -29.10kJ I know that Delta Go = -RT lnK and that R=8.314e-3kJ/K mol -delta Go / RT I did -29.10 / 8.314e-3 X 298K and -11.74 but this was wrong. I am stuck. What did I do wrong?
*Monday, April 23, 2012 at 6:01pm by Hannah*

**Chemistry**

Mg + 2HCl -> MgCl2 +H2 delta H = ? MgO + 2HCl (aq) -> MgCl2+ H2O delta H = ? H2+ 1/2O2 -> H2O delta H = -285.8 kJ Using Hess' Law find both the missing delta H values.
*Wednesday, March 28, 2012 at 5:03pm by Hunter*

**physics help!!!**

the volume occupied by 1kg of water at 100C and atmospheric pressure changes from 1L in the liquid phase to 1700L in the vapor phase. evaluate the difference in internal energy of 1kg of water vapor and 1kg of liquid water at the normal boiling point: So i have the equation is...
*Wednesday, June 24, 2009 at 10:27pm by sarah*

**Chemistry**

Calculate the delta H and delta S for the reaction. From there, calculate the delta G at 25 degrees Celsius. Predict whether it the reaction is spontaneous or non-spontaneous under standard conditions. CH3OH(l)+ O2(g)--> HCO2H(l)+ H2O(l) *i could not find the find the delta...
*Friday, February 26, 2010 at 6:53pm by Anonymous*

**Mike**

N2 + 3H2 --> 2NH3 At 25Â°C (delta)Ho = -92.22 kJ and (delta)So = -198.53 J/K. Using this information, calculate the equilibrium constant for the reaction at 2.43x10^2Â°C. (R = 8.314 J/K) Apparently the way I'm doing it is wrong: I divide 198.53 by 1000 then multiply by 298 ...
*Saturday, November 17, 2007 at 4:31am by Chemistry*

**Dan**

N2 + 3H2 --> 2NH3 At 25Â°C (delta)Ho = -92.22 kJ and (delta)So = -198.53 J/K. Using this information, calculate the equilibrium constant for the reaction at 2.43x10^2Â°C. (R = 8.314 J/K) Apparently the way I'm doing it is wrong: I divide 198.53 by 1000 then multiply by 298 ...
*Saturday, November 17, 2007 at 1:06pm by Chem*

**Chemistry**

For a particular reaction at 195.1 °C, ΔG = -1488.09 kJ/mol, and ΔS = 288.67 J/(mol·K).? Calculate ΔG for this reaction at -20.0 °C. delta G = delta H - (T*delta S) -1488.09 kJ/mol = (delta H) - ((461.8K)*(+288.67 J/(mol x K))*(1 kJ/1000 J)) -1488.09 kJ/mol = (...
*Tuesday, April 30, 2013 at 4:01pm by Dee*

**Physics HELP!!!!!!!!**

Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a negligible mass. The area of the piston is 3.06 10-2 m2, and the pressure outside the cylinder is 1.02 105 Pa. Heat (2109 J) is ...
*Saturday, April 21, 2007 at 1:23am by Mary*

**Teddy**

f(x,y) = 3x + 3y Show that for any epsilon in: |2x + 3y - 5| < epsilon There is a delta value: sqrt((x - 1)^2 + (y - 1)^2) < delta Solve for delta in terms of epsilon ------ I understand that this is a proof that the limit of f(x,y) as (x,y) -> (1,1) is 5. But I'm ...
*Thursday, January 24, 2013 at 2:49pm by calculus*

**science**

if it takes 31,500 joules of heat to warm 750g of water, what was the temperature change? My answer: Q = (M) (DeltaT) (c) Delta T=Q Delta T = 31,500J -------- 750gx 1.0cal/gCo Delta T = 42oC
*Saturday, April 26, 2008 at 12:53am by sam*

**Chem**

CH4(g)+2O2 arrow CO2(g)+2H2O(1) delta H=-890.3kJ. Calculate delta Hwhen 5 grams of methane react with an excess of oxgen?o i just divide Delta H by 5?
*Sunday, February 24, 2013 at 9:49pm by Anonymous*

**chemistry**

Given: *Fe2O3(s)+3CO(s)-->2Fe(s)+3CO2(g)(delta h is -23kJ) *3Fe2O3(s)+CO(g)-->2Fe3O4(s)+CO2(g)(delta h is -39kJ) *Fe3O4(s)+CO(g)-->3FeO(s)+CO2 (delta h is 18kJ) Desired:FeO(s)+CO(g)-->Fe(s)+CO2(g) find delta h for the desired reaction. which reactions do i reverse ...
*Wednesday, March 26, 2008 at 10:08pm by tanisha*

**science dr bob**

if it takes 31,500 joules of heat to warm 750g of water, what was the temperature change? My answer: Q = (M) (DeltaT) (c) Delta T=Q Delta T = 31,500J -------- 750gx 1.0cal/gCo Delta T = 42oC
*Friday, April 25, 2008 at 3:47pm by sam*

**Chemistry**

A sample of 2.00 mol O2 (assumed perfect) is originally confined in a 20.0L at 273K and 2.24 atm. it undergoes reversable adiabatic expansion until the volume has increased by a factor of 3. Calculate q, w, delta u, delta h, and delta t. Cv=7/2R and cp=5/2R
*Thursday, September 6, 2012 at 5:39pm by Erica*

**Physics**

What property of Maxwells equations results in electromagnetic waves? A. Moving charges create B B. There are no magnetic monopoles C. delta E/Delta t creates B and delta B/delta T creates E D. Charges create E and currents create B
*Saturday, October 30, 2010 at 3:27pm by Jessica*

**Chemistry**

How would you calculate delta H for the following reaction: 2P + 5Cl2 -> 2PCl5 Given: PCl3 + Cl2 -> PCl5 Delta H=-87.9 kJ 2P + 3Cl2 -> 2PCl3 Delta H=-574 kJ I have no clue how to do this since I was absent. Can someone help?
*Tuesday, March 3, 2009 at 1:05pm by Samantha*

**fin corp**

Delta has achieved an average return on equity of 36.5% for the last five years. If Delta generates a 17.2% net profit margin on sales of $3 billion and pays no dividends, what is Delta’s sustainable growth rate?
*Tuesday, May 26, 2009 at 3:58pm by Anonymous*

**Chemistry**

Na reacts violently with H2O to produce NaOH and H2. The resulting solution has a higher T than it did before the Na was added. What are the expected changes? deltaH ? deltaS >0 deltaG <0 deltaP >0 I know the last three for a fact. Is deltaG "<0" ? If the reaction ...
*Tuesday, April 3, 2007 at 9:27pm by Jennifer*

**Calculus**

Estimate delta(x) using the Linear Approximation and use a calculator to compute both the error and the percentage error. f(x)=cosx a=(pi/4) delta(x)=.06 delta(x)= ______ i got this part and it's -.04242 The error in Linear Approximation is: and The error in percentage terms ...
*Saturday, October 13, 2007 at 11:52pm by Anonymous*

Pages: **1** | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | Next>>