Saturday
April 19, 2014

Search: A zero-order reaction has a constant rate of 1.70×10−4 . If after 80.0 seconds the concentration has dropped to 6.00×10−2 , what was the initial concentration?

Number of results: 142,969

chemistry-rate of reaction
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 3.59110−3 M−1s−1. What is the initial rate of reaction in a reactor filled ...
Sunday, December 2, 2012 at 12:07am by Ron

CHEMISTRY!
A zero-order reaction has a constant rate of 3.4010−4 M/s. If after 80.0 seconds the concentration has dropped to 6.0010−2 M, what was the initial concentration?
Wednesday, February 25, 2009 at 5:25pm by Reese

Chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 4.09110−3 M−1s−1. What is the initial rate of reaction in a reactor filled ...
Thursday, November 29, 2012 at 12:06am by Odesa

chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 2.59110−3 M−1s−1. What is the initial rate of reaction in a reactor filled ...
Thursday, November 29, 2012 at 7:55pm by mike

chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 5.59110−3 M−1s−1. What is the initial rate of reaction in a reactor filled ...
Friday, November 30, 2012 at 12:30am by maliya

Science
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 1.09110−3 M−1s−1. What is the initial rate of reaction in a reactor filled ...
Wednesday, December 5, 2012 at 9:12pm by Shelly

chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 2.09110−3 M−1s−1. What is the initial rate of reaction in a reactor filled ...
Saturday, December 8, 2012 at 10:40am by Anonymous

CHEMISTRY HELP NEEDED!!
Given info: Reaction: 3A+2B--->2C+D {A] (mol/L) 1.0 10^-2 1.0 10^−2 2.0 10^−2 2.0 10^−2 3.0 10^−2 [B] (mol/L) 1.0 3.0 3.0 1.0 3.0 Rate of appearance of C (mol/L-hr) 0.3010^−6 8.1010^−6 3.2410^−5 1.2010^−6 7.3010^&#...
Sunday, March 11, 2012 at 9:00pm by Kelly

chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 6.091×10−3 M−1s−1. What is the initial rate of reaction in a reactor ...
Thursday, November 29, 2012 at 10:20am by NIK

chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 6.091×10−3 M−1s−1. What is the initial rate of reaction in a reactor ...
Thursday, November 29, 2012 at 9:02am by sveta

Chemistry
Given info: A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 10^-2 1.0 0.3010^−6 1.0 10^−2 3.0 8.1010^−6 2.0 10^−2 3.0 3.2410^−5 2.0 10^−2 1.0 1.2010^−6 3.0 10^−2 3.0 7.3010^−5 Reaction: 3A+2B--->...
Sunday, March 11, 2012 at 8:47pm by Kelly

chemistry
The reaction A + B to C + D is second order in A and zero order in B. The value of k is 1.1010−2 M^{-1}\;min^{-1}. What is the rate of this reaction when A}]=0.124 M and B}]=3.89 M?
Sunday, February 28, 2010 at 6:30am by joe

chemistry
The reaction A + B to C + D is second order in A and zero order in B. The value of k is 1.1010−2 M^{-1}\;min^{-1}. What is the rate of this reaction when A}]=0.124 M and B}]=3.89 M?
Sunday, February 28, 2010 at 5:34pm by joe

Chemistry
A zero-order reaction has a constant rate of 3.2010^−4 M/s. If after 35.0 seconds the concentration has dropped to 9.0010^2M , what was the initial concentration?
Friday, April 30, 2010 at 11:28pm by D.Walker

chemistry
1) The activation energy of a certain reaction is 35.3 kJ/mol. At 20 degrees C, the rate constant is 0.0130 s^-1. At what temperature would this reaction go twice as fast? Answer in units of degrees Celsius. i think the answer is around 34, but i keep in getting it screwed up...
Tuesday, January 29, 2008 at 4:32pm by Evets

rate constant
A reaction has a rate constant of 1.2510−4 at 28 and 0.227 at 77. Determine activation barrier for reaction What is the value of the rate constant at 18?
Sunday, February 10, 2013 at 11:55pm by charlie

Chemistry
1)For the reaction, A = B + C, the rate law is k(A). If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant? I was going to do 80/10 = 8 and then 8 times .70 but im not sure this is correct.
Monday, February 20, 2012 at 12:26am by Hannah

chemistry
The reaction Cl(g)+ O3(g) --> ClO(g)+ O2(g) is the first-order in both reactants. Determine the pseudo-first-order and second-order rate constants for the reaction from the data in the table below if the initial ozone concentration was ..0000000000825 M or 8.25*10^-11 M. ...
Monday, October 15, 2012 at 7:13pm by Brun

chemistry
The reaction Cl(g)+ O3(g) --> ClO(g)+ O2(g) is the first-order in both reactants. Determine the pseudo-first-order and second-order rate constants for the reaction from the data in the table below if the initial ozone concentration was ..0000000000825 M or 8.25*10^-11 M. ...
Monday, October 15, 2012 at 9:35pm by Brun

chem
A certain first-order reaction has a rate constant of 2.75 10-2 s−1 at 20.C. What is the value of k at 50.C if Ea = 75.5 kJ/mol? i know to use the ln(k1/k2)= (ea/R)((1/T1)-(1/T2)) but how do i know what T2 is when i only have one temp? there is a b part to the question...
Sunday, February 10, 2013 at 12:54pm by Hannah

CHEM
1.) At what temperature will the rate constant for the reaction H2 + I2 to 2HI have the value 5.210−3 M^{-1}s^{-1}? (Assume k=5.4 *10^{-4}M}{-1)s}^{-1} at 599 K and k=2.8 * 10^{-2}M}^{-1}s}^{-1} at 683 K.) 2.)For the first-order reaction N2O5 to 2NO2 + 1/2O2 t_{1/2}=22....
Wednesday, March 3, 2010 at 5:06am by anonymous

chemistry
1.) At what temperature will the rate constant for the reaction H2 + I2 to 2HI have the value 5.210−3 M^{-1}s^{-1}? (Assume k=5.4 *10^{-4}M}{-1)s}^{-1} at 599 K and k=2.8 * 10^{-2}M}^{-1}s}^{-1} at 683 K.) 2.)For the first-order reaction N2O5 to 2NO2 + 1/2O2 t_{1/2}=22....
Wednesday, March 3, 2010 at 3:13pm by anonymous

chemistry
how do you solve this problem? consider the reaction A->B the rate of the reaction is 1.6 x 10^-2 M/s when the concentration of A is 0.35 M. Calculate the rate constant if the reaction is a) first order in A and b) second order in A.
Thursday, July 15, 2010 at 1:10am by Jin

chemistry
The units of a rate constant for zero, first and second order reactions are given in the textbook. If the time units are minutes, what would you expect the units to be for a third order reaction? a. 1/min3 b. mol2/L2-min c. L/mol-min2 d. L2/mol2-min e. L2/mol2-min2 help help! ...
Saturday, February 18, 2012 at 9:19pm by elvis

chemistry
The reactant concentration in a second-order reaction was 0.790 after 200 and 8.8010−2 after 740 . What is the rate constant for this reaction?
Sunday, May 20, 2012 at 6:10pm by Anonymous

chemistry
3) The reactant concentration in a zero-order reaction was 0.100 M after 125 s and 1.5010−2 M after 385 s. What is the rate constant for this reaction? What was the initial reactant concentration for the reaction? I found the rate constant to be 3.27 x 10^-4 M/s, but im...
Tuesday, January 29, 2008 at 4:32pm by DrBob222

Chem2
A reaction in which A, B, and C react to form products is zero order in A, one-half order in B, and second order in C. If the concentration of C is increased by a factor of 4.95 (and all other concentrations are held constant), how much will the rate of reaction increase?
Monday, May 2, 2011 at 10:11pm by Ryan

Chemistry
The following reaction is first order and the rate constant is 2.35 x 10^-4 s^-1 at 20 degress C. 2 N2O5 -----> 2 N2O4 + O2 A.) What is the rate of reaction if the [N2O5]=.25 M? rate = k[N2O5] B. What would the [N2O5] be after 100 s given that the initial [N2O5] was 0.25 M...
Tuesday, November 20, 2012 at 11:54am by DrBob222

Chemistry
calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 10^-2 1.0 0.3010^−6 1.0 10^−2 3.0 8.1010^−6 2.0 10^−2 3.0 3.2410^−5 2.0 10^−2 1.0 1.2010^−6 3.0 10^−2 3.0 7.3010^−5
Sunday, March 11, 2012 at 5:41pm by Kelly

Chemistry
calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 10^-2 1.0 0.3010^−6 1.0 10^−2 3.0 8.1010^−6 2.0 10^−2 3.0 3.2410^−5 2.0 10^−2 1.0 1.2010^−6 3.0 10^−2 3.0 7.3010^−5
Sunday, March 11, 2012 at 6:12pm by Kelly

Chemistry
calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 10^-2 1.0 0.3010^−6 1.0 10^−2 3.0 8.1010^−6 2.0 10^−2 3.0 3.2410^−5 2.0 10^−2 1.0 1.2010^−6 3.0 10^−2 3.0 7.3010^−5
Sunday, March 11, 2012 at 6:13pm by Kelly

Chemistry
calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 10^-2 1.0 0.3010^−6 1.0 10^−2 3.0 8.1010^−6 2.0 10^−2 3.0 3.2410^−5 2.0 10^−2 1.0 1.2010^−6 3.0 10^−2 3.0 7.3010^−5
Sunday, March 11, 2012 at 6:14pm by Kelly

Chemistry
The rate constant, k, for each reaction order is equal to _____ from the linear plot. Reaction Order Answer zero ______ first ______ second ______ a. slope (m) b. y-intercept c. x-intercept d. negative of the slope (-m) e. 0 i think zero order is maybe d? not sure
Saturday, November 14, 2009 at 8:04pm by Yo

Chemistry11
1 and 2; C is same, B is same, A doubles and rate stays same; therefore, the reaction is zero order for A. 2 and 3. C is same. A doesn't matter since it is zero order. B doubles and rate doubles; therefore, the reaction is 1st order with in B. 1 and 4. A same. B same. C ...
Sunday, February 17, 2013 at 4:55am by DrBob222

Chemistry
The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k=1.6108M−1s−1 at 4∘C. If the tropospheric concentrations of OH and CF3CH2F are 8.1105 and 6.3108 molecules cm−3, ...
Tuesday, March 25, 2014 at 10:03pm by Rebecca

Chemistry
A certain first-order reaction has a rate constant of 2.6010−2 s-1 at 18 C. What is the value of k at 55 C if Ea = 90.0 kj/mol?
Monday, February 6, 2012 at 4:27pm by gary

Chemistry
Your Open Question Show me another Chemistry help needed... Confused? The following reaction is first order and the rate constant is 2.35 x 10^-4 s^-1 at 20 degress C. 2 N2O5 -----> 2 N2O4 + O2 A.) What is the rate of reaction if the [N2O5]=.25 M? B. What would the [N2O5...
Tuesday, November 20, 2012 at 11:54am by Krissy

Chemistry
At a given Temperature, the elementary reaction A<--->B in the forward direction is first order in A with a rate constant of 3.90*10^-2s^-1. The reverse reaction is first order in B and the rate constant is 8.20*10^-2s^-1. What is the value at equillibrium for the ...
Monday, March 18, 2013 at 11:06pm by Christina

Chemistry
The following reaction was studied at −10C. 2 NO(g) + Cl2(g) → 2 NOCl(g) The following results were obtained where the rate of the reaction is given below. [NO]o [Cl2]o INITIAL RATE 0.10 0.10 0.18 0.10 0.20 0.36 0.20 0.20 1.45 What is the rate law? What is the ...
Tuesday, March 20, 2012 at 12:22am by Kaleen

chemistry
In the initial first order reaction, rate = k[substrate concentration] As time passes the enzyme becomes bound with substrate into an enzyme-substrate complex. At this point the rate of product formation depends on the rate of decomposition of the complex and independent of ...
Sunday, September 21, 2008 at 6:14pm by GK

Chemistry(Please check)
A reaction has a rate law, rate = k times A times B squared. What is the overall order of the reaction. I think that the order is 0. Is this correct?
Sunday, February 19, 2012 at 4:18pm by Hannah

Chemistry
Well, if the concentration of OH- were near zero, the rate would b...... I agree b is the general answer. ************************* a+b=c rate is =k[a][b] ******************************* However, warning: if a+b=c and b is in great concentration, and remains so during the ...
Sunday, July 3, 2011 at 4:11am by bobpursley

chemistry
A first-order reaction is 40% complete at the end of 50 minutes. What is the value of the rate constant (in min^-1)? A. 1.8 x 10^-2 B. 1.0 x 10^-2 C. 1.2 x 10^-2 D. 8.0 x 10^-3 E. none of these how would i approach this problem? i know that to find the rate constant, i could ...
Monday, May 26, 2008 at 7:42pm by jesse may

Chemistry
At a given temperature, the elementary reaction A <=> B in the forward direction is first order in A with a rate constant of 2.60 x 10^-2 s^-1. The reverse reaction is first order in B and the rate constant is 8.50 x 10^-2 s^-1. What is the value of the equilibrium ...
Monday, March 5, 2012 at 11:37pm by Jessica

Chemistry
The reaction: 2 HI==> H2 + I2, is second order and the rate constant at 800 K is 9.70 x 10-2 M-1 s-1. How long will it take for 8.00 x 10-2 mol/L of HI to decrease to one-fourth of its initial concentration?
Wednesday, March 3, 2010 at 10:18am by Sleepy

chemistry
For the reaction, A = B + C, the rate law is kA]. If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant? a. 0.00450 s-1 b. 0.0290 s 1 c. 0.00530 s-1 d. 0.0150 s-1 e. 5.40 s-1 chemistry - DrBob222, ...
Saturday, February 18, 2012 at 9:20pm by elvis

Dr.Bob222 Chem
Yes and no. What I said, or should have said, is that changing the temperature by 10 C (approximately) doubles the rate. The question asked for the temperature at which the rate was doubled. So yes, the reaction rate is constant but ONLY for that particular temperature. At any...
Friday, February 1, 2013 at 10:15pm by DrBob222

chemistry
The rate constants for a first order decay reaction are found to be: k287.3∘C=1 x 10−4 s−1 k327.4∘C=19.2 x 10−4 s−1 a) Determine the value, in s-1 of k250∘C (b) How long will it take, at 350 ∘C, for the reactant to decay to 1% of...
Friday, January 11, 2013 at 5:27am by Anonymous

Chemistry
The rate constants for a first order decay reaction are found to be: k287.3∘C=1 x 10−4 s−1 k327.4∘C=19.2 x 10−4 s−1 (a) Determine the value, in s-1 of k250∘C (b) How long will it take, at 350 ∘C, for the reactant to decay to 1% ...
Friday, January 11, 2013 at 10:26am by selly

Concentration and Reaction
The rate of the following reaction: Radioactive decay of 90Sr, is characterized by the rate constant k = 0.024 year-1. What is the half-life (in years) for this reaction at the same conditions when the initial concentrations are 0.0356 M? (Round your answer to 3 significant ...
Saturday, November 20, 2010 at 10:36pm by Confused

chemistry
When the reaction is run in a buffer solution, however, it is pseudo-first-order in CH3I. rate = k[CH3] What is the half-life of this reaction in a pH 10.00 buffer if the pseudo-first-order rate constant for this reaction is 7.3 x10-9 s-1?
Friday, June 5, 2009 at 3:00am by anglo

physics
Four charges −8 10^−9 C at (0 m, 0 m), −7 10^−9 C at (5 m, 1 m), −1 10^−9 C at (−2 m, −3 m), and 2 10^−9 C at (−2 m, 4 m), are arranged in the (x, y) plane as shown. Find the magnitude of the resulting force ...
Wednesday, January 29, 2014 at 11:26pm by sarah

chemistry ASAP please!!
The reaction of CO(g) + NO(g) is second-order in NO2 and zero-order in CO at temperatures less than 500K. (a) Write the rate law for the reaction. (b) How will the reaction rate change if the NO2 concentration is halved? (c) How will the reaction rate change is the ...
Tuesday, March 15, 2011 at 12:39pm by Maria

chemistry
The rate constant of a first-order reaction is 4.25 x 10^-4 s^-1 at 350 Celsius. If the activation energy is 103 kJ/mol, calculate the temperature at which its rate constant is 8.75 x 10^-4 s^-1.
Tuesday, March 25, 2014 at 11:21pm by santoki

CHEM- KINETICS
The rate constant for a reaction is 4.65 L mol-1s-1. The overall order of the reaction is: zero first second third I am having trouble with the order of reactions. I dont understand this question. this is an assignment question but i have no idea how to do it.
Saturday, September 25, 2010 at 9:53pm by lucylu

college chemistry
The rate of the following reaction: 2 NO2 2 NO + O2, is characterized by the rate constant k = 0.775 Lmol-1s-1. What is the half-life for this reaction at the same conditions when the initial concentrations are 0.0115 M? (Round your answer to 3 significant figures.) Hint: The...
Wednesday, November 10, 2010 at 4:38pm by sparkle

Chemistry
A reaction is first order and it takes 324 minutes for the reaction to be 50.0% complete. How long will it take for the reaction to be 85.0% complete at the same temperature? 2. N2O5 decomposes to N2O4 and O2 and the reaction is first order in N2O5 with a specific rate ...
Saturday, July 17, 2010 at 8:31pm by Lin

Chemistry
The units for rate of reaction are (M/s). For a first order reaction, rate=(rate constant)*(concentration) Unit analysis: (M/s)=(?)*(M) => Units of a first order rate constant are 1/s.
Friday, February 22, 2008 at 10:51am by Kat

Chemistry
The reaction 2B--->C + 2D is found to be zero order when run at 990 degrees C. If it takes 3.3X110^2 s for an initial concentration of B to go from 0.50 M to .20 M what is the rate constant for the reaction? what is the half life of the reaction under these conditions?
Friday, February 29, 2008 at 11:18pm by Lauren

Chemistry
The reaction: 2 HI==> H2 + I2, is second order and the rate constant at 800 K is 9.70 x 10-2 M-1 s-1. How long will it take for 8.00 x 10-2 mol/L of HI to decrease to one-fourth of its initial concentration? can someone please show me how to set this up?
Wednesday, March 3, 2010 at 7:58pm by Bababab

Chemistry
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 8.591x10-3 M-1s-1. What is the initial rate of reaction in a reactor filled with AhF to a ...
Monday, December 10, 2012 at 1:31am by Please Help Me!!!!!!!!

Chemistry
A second order reaction has a rate constant of 8.7x10^-4/(M*s) at 30 degrees C. At 40 degrees C the rate constant is 1.8x10^-3/(M*s). What are the activation energy and frequency factor for this reaction? Predict the value of the rate constant at 4 degrees C
Friday, February 29, 2008 at 11:20pm by Lauren

Chemistry
The following rearrangement reaction is first order: C3H6 CH3CH=CH2 The rate constant for this reaction is 6.7 ~ 10−4. How many minutes will it take for the concentration of C3H6 to drop to 11.75% of its initial value? How do I calculate this step by step. My answer ...
Sunday, March 20, 2011 at 10:07am by Alex

Rate Laws
If the initial concentration of AB is 0.210 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75 s? The reaction is in the second order: rate=k[AB]^2 The rate constant is k=5.4*10^2 M*s I don't understand how to find A and...
Saturday, February 20, 2010 at 3:13pm by Kyle

Chem II
The equilibrium constant of a reaction is 12.6. If the rate constant of the reverse reaction is 5.1 x 10 -2 the rate constant for the forward reaction is _____ 0.32 0.16 0.64 0.08 I don't even know where to start on this question. Any direction will help
Monday, June 16, 2008 at 9:57pm by Ken

Chemistry
1. The following data was collected for the reaction between hydrogen and nitrogen monoxide. The time recorded corresponds to a N2 concentration change of 5.3 x 10-4 M. 2H2(g) + 2NO(g)  2H2O(g) + N2(g) Trial [H2], M [NO], M Time, s 1 0.01 0.02 74 2 0.02 0.02 37 3 0.01 ...
Tuesday, June 4, 2013 at 9:58pm by Jason

Chemistry
The rate constant for a certain reaction is = 4.3010−3 s^-1. If the initial reactant concentration was 0.400 M , what will the concentration be after 19.0 minutes? Rate would be first order therefore I used. A=A initial*e^-kt I keep getting .0030 M but supposely I am ...
Sunday, January 31, 2010 at 3:10am by Joanna

Diana’s dresses: the story behind the fashio
Login Home About Us Contact Press & Media Royal Calendar Line Of Succession Site News
Sunday, April 28, 2013 at 6:33pm by Karlie Kloss: I&amp;amp;amp;amp;amp;amp;amp;am

Chemistry Lab
What would happen to the reaction rate of a solution if 10 mL or more of water is added? Will the reaction rate increase or decrease? The following reaction occurs without a change in the color 2A (g) + B2(g) --- 2AB (g) a) How could you monitor the concentration of the ...
Monday, July 20, 2009 at 11:07pm by Sunshine

Chemistry Lab
What would happen to the reaction rate of a solution if 10 mL or more of water is added? Will the reaction rate increase or decrease? The following reaction occurs without a change in the color 2A (g) + B2(g) --- 2AB (g) a) How could you monitor the concentration of the ...
Monday, July 20, 2009 at 11:08pm by Sunshine

Chem II
The rate constant for a reaction at 305.0 K is two times the rate constant at 295.0 K. The activation energy of the reaction is ______ kJ mol
Friday, June 13, 2008 at 5:02pm by Ken

Chemistry - enthalpy and rate constant (check)
22. The rate of a chemical reaction is dependent on its ΔH. Do you agree or disagree with this statement? Briefly justify your answer. I agree with the above statement, enthalpy is defined as the internal energy of the reactants and products therefore the chemical ...
Wednesday, June 8, 2011 at 2:36pm by Farah

Chemistry
At what temperature will the rate constant for the reaction have the value 6.510−3 M/s? (Assume k = 5.4 * 10^-4 M/s-1 at 599K and k = 2.8 * 10^-2 M/s at 683K .)
Thursday, January 31, 2013 at 2:57pm by Lisa

chemistry ASAP please!!
One reaction that destroys O3 molecules in the stratosphere is NO + O3  NO2 + O2 When this reaction was studied in the laboratory, it was found to be first order with respect to both NO and O3 with a rate constant of 1.9 x 104 mol L-1S-1. If [NO] = 1.2 x 10-5 mol L-1 ...
Sunday, March 20, 2011 at 6:48pm by Massiel

Chemistry
a certain first order decomposition reaction has a half-life of 15.0 minutes. What is the rate constant for this reaction? what is the time it will take for the reaction to reach the 10% completion point?
Wednesday, October 24, 2012 at 9:02pm by Josh

Chemistry
A first order reaction has a rate constant of 0.0733 s−1. What is the half life for this reaction in seconds? when I plug in the numbers in the formula, my answer was 9.45. But on the computer it says the answer is wrong. How do I find the right answer?
Sunday, March 20, 2011 at 9:56am by Alex

chemistry
The rate constant, k, for each reaction order is equal to _____ from the linear plot. Reaction Order Answer zero:___ first: ___ second: ___ a. slope (m) b. y-intercept c. x-intercept d. negative of the slope (-m) e. 0
Thursday, May 10, 2012 at 8:14pm by jen

Chemistry
The reaction 2NO2--->2NO+O2 has the rate constant k= 0.68 m-1s-1. If the initial concentration of NO2 is 9.3010−2 M, how long it would take for the concentration to decrease to 2.0010−2 M ? please answer and show the steps
Thursday, February 9, 2012 at 11:21pm by Jeremy

Chemistry
In a reversible reaction, chemical equilibrium is attained when ? 1. Rate of the forward reaction is greater than the rate of the reverse reaction. 2. Rate of the reverse reaction is greater than the rate of the forward reaction, 3. Concentration of the reactants reaches zero ...
Wednesday, March 9, 2011 at 4:49pm by Jazmin F.

chemistry
a first order reaction has a rate constant of 7.5 x 10^-3/s. The time required for th reaction to be 60% complete is
Tuesday, June 17, 2008 at 2:28pm by Angel

Chemistry(Please check)
1) The reaction A + B + C = products has a rate law rate = k times A times C squared. Which of the following will result in an increase in the rate constant for the reaction? #1 - increasing the temperature #2 - adding a catalyst #3 - doubling the concentration of reactant C I...
Sunday, February 19, 2012 at 6:07pm by Hannah

Chemistry
1) The rate expression for the reaction 2 SO2 + O --> 2 SO3 is given by rate = k [SO2]2[O2]. The overall order of this reaction is: first order 2)The rate reaction between A and B is expressed as rate = k [A][B]. To produce the greatest increase in the reaction rate: double...
Sunday, December 23, 2007 at 8:42am by Anonymous

Second order half life
At 100 degrees C , a certain substance undergoes second-order decomposition with a half-life of 26 minutes. If the initial concentration of the substance is 3.910−2M , what is the value of the rate constant at 100degrees C? So I put in (1560seconds) 1/2 = 1/ k (3.910&#...
Tuesday, September 21, 2010 at 6:46pm by Sar

chem
The reaction A + B C + D is second order in A and zero order in B. The value of k is 0.012 M-1 min-1. What is the rate of this reaction when [A] = 0.125 M and [B] = 0.435 M?
Monday, February 11, 2008 at 1:55am by Sarah

chem
The reaction A + B -> C + D is second order in A and zero order in B. The value of k is 0.012 M-1 min-1. What is the rate of this reaction when [A] = 0.125 M and [B] = 0.435 M?
Monday, February 11, 2008 at 1:55am by Sarah

chemistry
The reaction A + B --> C + D is second order in A and zero order in B. The value of k is 0.012 M-1 min-1. What is the rate of this reaction when [A] = 0.125 M and [B] = 0.435 M?
Monday, February 11, 2008 at 9:06am by Anonymous

chemistry
The rate law of the overall reaction. A + B -> C is rate = k[ A ]^2 Which of the following not increase the rate of a chemical reaction? a) increasing the temperature of the reaction b)increasing the concentration of reaction A c)adding a catalyst for the reaction d)...
Thursday, November 18, 2010 at 1:23pm by ben

Chemistry
Given the two reactions 1.PbCl2 <--->Pb^2+ + 2 Cl^-, K1= 1.8210^−10 2. AgCl <----> Ag^+ + Cl^-, K2 = 1.1510−4 what is the equilibrium constant Kfinal for the following reaction? PbCl2+ 2 Ag^+ <---> 2AgCl+ Pb^2+ This is what i have soo far: PbCl2...
Thursday, February 5, 2009 at 8:40pm by Saira

Chemistry
The reaction between NO (nitric oxide) and oxygen is a key step in the formation of acid rain. O2(g) + 2NO(g) → 2NO2(g) A series of experiments were run, each of which starts with a different set of reactant concentrations. From each experiment an initial rate of ...
Tuesday, March 27, 2012 at 5:16am by Roman

Differential Equations
the rate is proportional to r(t) times a constant dr/dt=r(t)* constant where the constant is negative and the solution to this first order diff equation is of the form r(t)=K*e^(- λ)t + C b. ro=K+C and at t=inf, r(inf)=0 which implies C is zero, so k=ro. r(t)=ro*e^- λ t
Thursday, January 17, 2013 at 10:08pm by bobpursley

chemistry
The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out first order and changes ...
Saturday, February 18, 2012 at 9:21pm by elvis

chemistry
The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out first order and changes ...
Saturday, February 18, 2012 at 9:28pm by elvis

chemistry
Given this data in a study on how the rate of a reaction was affected by the concentration of the reactants Initial Rate, RUN #(A, M) (B, M) (C, M) (mol L-1 s-1 1 0.200 0.100 0.600 5.00 2 0.200 0.400 0.400 80.0 3 0.600 0.100 0.200 15.0 4 0.200 0.100 0.200 5.00 5 0.200 0.200 0....
Saturday, February 18, 2012 at 9:18pm by elvis

Chem
Given the following hypothetical reaction: 2 E(g) + F(g) + G(g) products. If the rate law is: Rate = k[E]2[F]-1, what is the overall order of reaction? 1. a. zero 2. b. first 3. c. second 4. d. third
Saturday, April 24, 2010 at 6:40pm by Mark

Chemistry
Here is a site that gives them. http://en.wikipedia.org/wiki/Reaction_rate_constant#Units Here is how you can do, say zero order and first order. Remember rate of the reaction is measured in M/s. zero order: Rate = k = M/s = (moles/L*s) first order: Rate = k(A) k = rate/(A) k...
Friday, February 15, 2013 at 12:34am by DrBob222

Chem
Variation of the rate constant with temperature for the first-order reaction 2N2O5(g)  2N2O5(g) + O2(g) Is given in the following table. Determine graphically the activation energy for the reaction. T(K) k(s^-1) 2981.74 x 10^-5 308 6.61 x 10^-5 318 2.51 x 10^-4 328 7....
Saturday, July 17, 2010 at 3:35pm by Paul

Chemistry
Problem: In a first order decomposition reaction, 50% of a compound decomposes in 10.5 minutes. What is the rate constant of the reaction? The solution my professor gave says: k = .693 / 10.5min Where did the .693 come from? Thanks
Monday, March 15, 2010 at 6:17pm by Help

chemistry
A 50-mL Mohr buret is connected to a 1-ft length of capillary tubing. The buret is then filled with water and the volume of water versus time is monitored as the water gradually flows through the capillary tubing. This process is found to be first-order with a rate constant of...
Sunday, May 16, 2010 at 10:36pm by eng

Chemistry
What is the value of the rate constant for a reaction in which 75.0 percent of the compound in a given sample decomposes in 80.0 min? Assume first order kinetics. Use the integrated rate law for a first order reaction. Remember at 75 percent reaction, 25 percent of the ...
Wednesday, September 19, 2012 at 8:13pm by Bryan

Chemistry
What is the value of the rate constant for a reaction in which 75.0 percent of the compound in a given sample decomposes in 80.0 min? Assume first order kinetics. Use the integrated rate law for a first order reaction. Remember at 75 percent reaction, 25 percent of the ...
Wednesday, September 19, 2012 at 8:22pm by Bryan

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members