Wednesday
May 22, 2013

# Search: rate laws and concentrations :: Chemistry

Number of results: 107,879

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...
Saturday, February 20, 2010 at 3:13pm by Kyle

chemistry
Which of the following rate laws is cor- rect for the given mechanism? You have not shown any rate laws.
Monday, January 10, 2011 at 10:04pm by Dr Russ

chemistry
The following reaction is a single-step, bimolecular reaction: CH3Br + NaOH --&gt; CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.135 M, the rate of the reaction is 0.0070 M/s. (a) What is the rate of the reaction if the concentration of CH3Br is doubled...
Saturday, March 24, 2012 at 2:18pm by katie

Chemistry- rate laws
rate for second order rxn = k(A)^2 0.1 = k(0.01)^2 Solve for k. Then substitute k into rate = k(A)^2 with A = 0.5 and solve for rate. The answer is 250 which i 2.5E2.
Tuesday, September 18, 2012 at 10:18am by DrBob222

chemistry
Determine the overall orders of the reactions to which the following rate laws apply: a) rate= k[NO2]^2 b) rate = k c) k [H2][Br2]^1/2 d) k [NO]^2[O2] is it.. a. 2 b. 0 c. 1 1/2 d. 3
Thursday, July 15, 2010 at 1:03am by Jin

rate laws and concentrations :: Chemistry.
A student studied the kinetics of the reaction of sodium hypochlorite and a vegetable dye by the method of pseudo order. He mixed 5 mL of a 0.67 M solution of NaOCl with 15 mL of a vegetable dye, he took a portion of the mixture and absorbance was measured at intervals of 20 ...
Wednesday, June 16, 2010 at 1:56pm by JACOBY

Chemistry
For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO]...
Monday, February 20, 2012 at 4:29pm by Hannah

Chemistry
For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO...
Monday, February 20, 2012 at 3:10pm by Hannah

chemistry
For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-l s-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO...
Friday, February 17, 2012 at 9:18pm by steve

Chemistry
For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate,mol L-l s-1 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO]...
Tuesday, February 21, 2012 at 5:18pm by Kay

chemistry
The tendency of water/solvent to flow from concentrations where solute concentrations are high across a membrane to concentrations where solute concentrations are low to give an equal water/solvent to solute ratio on both sides of the membrane.
Friday, February 1, 2013 at 1:55am by Devron

Chemistry
The reaction X + Y --&gt; products was studied using the method of initial rates. The initial rate of consumption of X was measured in three different experiments. What is the value of the rate constant, k? *concentrations are in mol/L and initial rates are in molL-1s-1 ...
Wednesday, February 23, 2011 at 10:51am by Jamie

Organic Chem
The following reaction is a single-step, bimolecular reaction: CH3Br + NaOH ---&gt; CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.150 M, the rate of the reaction is 0.0090 M/s. a) what is the rate of the reaction if the concentration of CH3Br is doubled...
Wednesday, November 9, 2011 at 2:50am by Bryan

Anthropologhy
Sumptuary laws are: (Points : 1) property laws. marriage laws. religious laws. civil laws.
Sunday, April 7, 2013 at 1:46pm by Tawnya

college chemistry
The rate of the following reaction: 2 NO2 2 NO + O2, is characterized by the rate constant k = 0.775 L·mol-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.) ...
Wednesday, November 10, 2010 at 4:38pm by sparkle

Chemistry
DrBob's suggestion is very good. If you do not have easy access to a lab, here is a clue: • Cu(H2O)4^2+ ions dominate at low CuBr2 concentrations and they are blue. • CuBr4^2- ion concentrations appear at high Br- ion concentrations and their color is green.
Sunday, June 21, 2009 at 7:24am by GK

chemistry
You must know the rate law equation and the concentrations of the substances involved.
Saturday, March 10, 2012 at 7:42pm by DrBob222

chemistry
disappearance of NO in ...- Help!!!? The following data were collected for the rate of disappearance of NO in the reaction 2 NO(g) + O2(g) ¨ 2 NO2(g). Run: [NO](M) [O2](M) Initail Rate (M/s) 1 .0126 .0125 1.41 X 10^-2 2 .0252 .0125 5.64 X 10^-2 3 .0252 .0250 1.13 X ...
Wednesday, January 30, 2013 at 5:55pm by Hannah

Chemistry
Okay, so I found the ion concentrations through the Henderson-Hasselbalch equation, and the concentrations I got: [Acetic Acid] = 0.036525666 [Acetate] = 0.063474334 I got the same concentrations as when I did my ice chart, and I also got the same delta pH, which was -0.266.
Friday, March 18, 2011 at 8:57pm by Sandra

Chemistry
Consider the equilibrium 2NOCl (g) &lt;---&gt; 2NO (g) + Cl2 (g). In a 1 L container @ equilibrium there are 1.0 mol NOCL, 0.70 mol NO, and 0.40 mol Cl2. @ constant temperature and volume, 0.10 mol NaCl is added. What are the concentrations in the "new" ...
Saturday, April 13, 2013 at 2:52pm by Anna

Chemistry
Did the teacher put them in as initial concentrations or are they changes or equilibrium concentrations?
Wednesday, February 29, 2012 at 9:01pm by DrBob222

chemistry
Determine the overall orders of the reactions to which the following rate laws apply: a. rate = k[NO2]^2 b. rate = k c. rate = k[H2][Br2]^1/2 d. rate = k[NO]^2[O2] I think the answers are: a. Second Order b. Zero Order c. First Order for H2 and One-half order for Br2 d. Second...
Sunday, July 18, 2010 at 9:58pm by Sara

Chemistry
Write a rate equation showing the dependence of rate in reactant concentrations for each of the following elementary reactions. a. CS2---&gt; CS + S b. CH3Br + OH- --&gt; CH3OH + Br- A. k[CS2][S] B. k[CH3][Br-][OH-]
Monday, February 18, 2008 at 12:28pm by Lauren

Chemistry
Write a rate equation showing the dependence of rate in reactant concentrations for each of the following elementary reactions. a. CS2---&gt; CS + S b. CH3Br + OH- --&gt; CH3OH + Br- A. k[CS2][S] B. k[CH3][Br-][OH-]
Sunday, February 17, 2008 at 6:49pm by Lauren

Chemistry
What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) or a)
Sunday, July 25, 2010 at 11:45pm by Bobz

Chemistry
What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting
Saturday, July 24, 2010 at 8:17pm by Bob

Government Check
What was the name of the discriminatory laws enacted in response to the 13th, 14th and 15th Amendments? a)Separate but Equal Laws *b)Jim Crow Laws c)Dred Scott Laws
Sunday, July 4, 2010 at 5:04pm by Ariel

Chemistry
Which of the following rate laws suggests that the reaction probably occurs in a single step? NO(g) + O2(g) &#8594; NO2(g) + O(g) rate = k[NO][O2] H2O2 + 3 I- + 2 H+&#8594; I3- + 2 H2O rate= kl[H2O2][I-]+K2[H2O2][I-][H+] H2(g) + Br2(g) &#8594; 2 HBr(g) rate = k[H2...
Monday, May 16, 2011 at 9:55pm by dude

Chemistry
1. For the reaction 2N2O(g) &#8651; O2(g) + 2N2(g), what happens to the equilibrium position if the pressure decreases? A. Shift to the right B. Shift to the left C. Doubles D. Does nothing E. Halves 2. if an equilibrium reaction shifts to the right when the system is ...
Tuesday, October 16, 2012 at 12:58am by josh

chemistry
Which of the following rate laws suggests that the reaction probably occurs in a single step? why is this problem cant be answer a since it has order of 1 a)(CH3)3CBr + OH- &#8594;(CH3)3COH + Br- rate = k[(CH3)3CBr] b)NO(g) + O2(g) &#8594; NO2(g) + O(g) rate = k[NO][O2...
Tuesday, May 18, 2010 at 12:34am by eng

chemistry
Which of the following rate laws suggests that the reaction probably occurs in a single step? why is this problem cant be answer a since it has order of 1 a)(CH3)3CBr + OH- &#8594;(CH3)3COH + Br- rate = k[(CH3)3CBr] b)NO(g) + O2(g) &#8594; NO2(g) + O(g) rate = k[NO][O2...
Monday, May 17, 2010 at 9:31pm by eng

chemistry
When the concentration of CH3Br and NaOH are both 0.150M, the rate of the reaction is 0.0020M/S. (a) What is the rate of the reaction if the concetration of CH3Br is doubled? _______________M/s (b) What is the rate of the reaction if the concentration of NaOH is halved? ...
Wednesday, February 27, 2013 at 1:49pm by dj

Chemistry- rate laws
CH3CHO decomposes into methane gas and carbon monoxide gas. This is a 2nd order reaction. Rate of decomposition at 140 degrees Celsius is .10M/s when the concentration of CH3CHO is .010. What is the rate of the reaction when the concentration of CH3CHO is .50M? Have not been ...
Tuesday, September 18, 2012 at 10:18am by Nancy

tommy
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.870 M, calculate the equilibrium concentrations of the gases.
Sunday, January 8, 2012 at 8:07pm by CHEMISTRY

Chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.520 M, calculate the equilibrium concentrations of the gases
Wednesday, May 5, 2010 at 7:12pm by Erin

chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g)= SO3(g) + NO(g) If all four gases had initial concentrations of 0.840 M, calculate the equilibrium concentrations of the gases.
Thursday, January 15, 2009 at 9:53pm by Enrique

chemistry 12
Equilibrium concentrations (a)(mol/L)// (b)(mol/L)// (c)(mol/L) 0.040 // 0.066 // 1.72x10^-2 0.080 // 0.017 // 8.8x10^-3 0.030 // 0.024 // 4.7x10^-3 My data was collected at 25&#9675;C for the reaction A(g) + B(g) = C(g) What i have to do now is involving three different ...
Monday, September 26, 2011 at 12:26pm by Robyn

Chemistry
A reaction A+B---&gt; C has a standard free energy change of -5.13 kj/mol at 25 degrees celcius, What are the concentrations of A, B, and C at equilibrium if at the beginning of the reaction there concentrations are .3M, .4M, and 0M respectively?
Tuesday, September 6, 2011 at 1:19am by juan777

Chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) &lt;==&gt; SO3(g) + NO(g)\ If all four gases had initial concentrations of 0.550 M, calculate the equilibrium concentrations of the gases.
Sunday, March 27, 2011 at 7:45pm by Amber

Consider the reaction of peroxydisulfate ion (S2O82-) with iodide ion (I -) in aqueous solution. S2O82-(aq) + 3 I -(aq) ¨ 2 SO42-(aq) + I3-(aq) At a particular temperature, the rate of disappearance of S2O82- varies with reactant concentrations in the following ...
Thursday, January 5, 2012 at 8:11pm by Kaanha

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

Kc =[ Fe+3] / [Fe+2][Ag+] You must be given the equilibrium constant or have access to enough information to calculated it. Since you have the initial concentrations of Fe^+2, Ag^+ and Fe^+3 with a known Kc, you can set up a table of data leadinf to an equation for changes in...
Thursday, March 26, 2009 at 11:51pm by GK

Chemistry
If those are equilibrium concentrations and the reaction is as below, then 2NO2 ==&gt; N2O4 Keq = (N2O4)/(NO2)^2 = ?? Plug in the equilibrium concentrations and calculate.
Tuesday, December 15, 2009 at 10:01am by DrBob222

Social Studies
Okay! I don't know the correct terminology for what I call MINI-LAWS. MINI-LAWS are laws added on to one big law. Example: Math has to make up 1/3rd of all lessons taught. MINI-LAWS would include...grades 3-12, college exempt. So can you tell me what the correct ...
Tuesday, July 22, 2008 at 3:14am by Minerva

Chemistry
Ammonium ion (NH4^+) reacts with nitrite ion (NO2^-) to yield nitrogen gas and liquid water. The following initial rates of reaction have been measured for the given reactant concentrations. Expt. # [NH4^+] [NO2^-] Initial rate (M/hr) 1 0.010 0.020 0.020 2 0.015 0.020 0.030 3...
Wednesday, February 6, 2013 at 7:04pm by Anonymous

Chemistry - Chemical Kinetics
1) if the concentrations of trace constituients of the atmosphere are expressed in molecules/cm3 , what would be the units of reaction rate???? i think the ans is molecules/cm3 per seconds since the usual units of reaction rate is mol per dm3 per seconds.....am i correct?
Sunday, January 30, 2011 at 8:45pm by Davia

chemistry
The bromination of acetone is acid-catalyzed. CH3COCH3 + Br2 CH3COCH2Br + H+ + Br - The rate of disappearance of bromine was measured for several different concentrations of acetone, bromine, and H+ ions at a certain temperature. [CH3COCH3] [Br2] [H+] rate of disappearance of ...
Monday, February 1, 2010 at 1:22pm by danielle

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
At a particular temperature, K=3.75 for the following reaction. SO2(g) + NO2(g) (reversible arrows) SO3(g) + NO(g) If all four gases had initial concentrations of 0.500 M, calculate the equilibrium concentrations of the gases. K=(.5+x)^2/(.5-x^2) solve for x I will be happy to...
Monday, July 30, 2007 at 7:04pm by Taasha

Chemistry
The equilibrium constant (Keq) is the ratio of ____ concentrations to ____ concentrations at equilibrium, with each concentration raised to a power equal to the number of ____ of that substance in the balanced chemical equation.
Friday, May 7, 2010 at 9:15am by MEGAN!!!!!!!!!!!

history
Yes. All civilizations have laws. They may be only oral and not written laws, but people need rules and laws when they live together.
Tuesday, September 25, 2007 at 2:41pm by Ms. Sue

Managerial Economics
Some states have had laws restricting the ssale of most goods on Sunday. Consumers, by and large, oppose such laws because they find Sundat afternoon a convenient time to shop. Paradoxically, retail trade associations frequently support the laws. Discuss the reasons for ...
Wednesday, June 18, 2008 at 10:33am by Dee

Chemistry- Kinetics
2. At 600 K the decomposition of gas ohase nitroethane (CH3CH2NO2) is first order with a rate constant of 1.9*10^-4 s^-1. CH3CH2NO2 --&gt; C2H4 + HNO2 a) Write out the differential and integrated rate laws for this reaction. b) If a 10.0g sample of nitroethane is heated to...
Saturday, April 7, 2012 at 10:14pm by Tasneem

Chemistry
Nitrogen Monoxide reacts with hydrogen gas to form nitrogen gas and water (vapor). (i). write a balanced equation for this reaction. (ii). The reaction is experimentally found to be (approx) first-order in H2 and second order in in NO. Write the form if the experimentally-...
Saturday, April 14, 2012 at 6:53pm by Crystal

Science
The correct verb is "are". "Laws" is plural. Newton is the discoverer of three laws of motion and one of gravity. A computer search will easily lead you to what the laws are.
Saturday, September 19, 2009 at 7:12pm by drwls

Chemistry
Kc for the reaction of hydrogen and iodine to produce hydrogen iodide, H2(g)+I2(g)f 2HI(g) is 54.3 at 430C. What will the concentrations be at equilibrium if we start with 0.240M concentrations of both H2 and I2?
Tuesday, November 29, 2011 at 11:09am by mary

chemistry
What are the concentrations of [H+] and [OH-] in each of the following. Determine the pH and pOH for each solution. A. 1.25 M HCl B. 0.25 M NaOH C. 0.035 M Ca(OH)2 D. 0.50 M HNO3 I know how to do the pH and pOH I just do not know how to figure out the both concentrations.
Wednesday, April 28, 2010 at 4:17pm by Anna

Math
2) should be 1/(B) = kt+1(A) I am dealing with concentrations and A and B are just placeholders for the concentrations. Thanks
Monday, May 13, 2013 at 10:33pm by Yasemine

ethics question
how HIPAA, GLB, and COPPA laws can help ensure people's privacy. What is their ethical justification? Is there gray area in these laws? How do some businesses try to find their way around these laws?
Sunday, November 7, 2010 at 10:26pm by Anonymous

chemistry
rate laws: zero order is rate = k so units are M/s or moles/l*s 1st order is rate = k*(A) k = rate/(A) = moles/L*ws/(moles/L) = 1/s or s^-1. Here is a site that will give you the units of zero, 1st, 2nd, and a formula for calculating any order units for k. Just scroll to that ...
Friday, February 17, 2012 at 9:20pm by DrBob222

Chemistry
DrBob222, the pka value would be 9.26,. but how would you figure out the concentrations of the acid and conjugate base (M). You would have 0.124 mol NH4Cl and 0.07416 mol NH3, but how do you get them to concentrations. I know I could divide each by the total volume, but the ...
Tuesday, May 12, 2009 at 8:56pm by Chelsea

Chemistry
Im pretty sure the concentrations that I obtained for the 5 flasks used are correct im just not sure I calculated the rate for each correctly. I was suppose to use the number of moles of I2 produced/L*min. For my I2 I got 6.66e-3 which was half of the S2O3^2- value which was 3...
Tuesday, February 28, 2012 at 9:10pm by Hannah

Physical Science
why does the maximum initial reaction rate cannot be reached at low substrate concentrations.
Monday, August 1, 2011 at 8:17pm by Ron

chemistry
For the following reaction at a certain temperature, it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.261 mol of F2 is added to this equilibrium mixture, calculate the concentrations of ...
Friday, November 13, 2009 at 11:32pm by Meghan

College Chemistry
What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.370 V? Given: A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25degrees C . The initial concentrations of Pb2+ and Cu2+ are 5.30×10&#8722;2 M and 1.60 M, ...
Saturday, June 23, 2012 at 2:45pm by Maria

Chemistry
A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a) rate = k (A)^2 b) rate = k (B)^2 c) rate = k (A) (B) d) rate = k (A) (B)^2 I think its D because there are 2 moles of B and 1 mole of A. Do you agree with my ...
Friday, February 24, 2012 at 2:34am by Mohamed

chemistry,
the question is, if concentrations do not change why is the equilibrium state considered dynamic? First of all I dont understand what makes a state dynamic? The reaction is not stopped, it is going forward, and reverse, at the same rate. Molecules are constantly reacting in ...
Wednesday, February 21, 2007 at 4:10pm by amy

chemistry
Some hydrogen and iodine are mixed up at 229 degrees celsiusin a 1-L container. When equilibrium is established, the following concentrations are present: [HI]= 0.490M, [H2]=0.080M, and [I2]= 0.060M. If an additional 0.300 mol of HI is then added, what concentrations of all ...
Wednesday, December 15, 2010 at 9:40pm by jlh

chemistry
Nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water (vapor). Write a balanced equation for this reaction. the reaction is experimentally found to be (approximately) first-order in H2 and second-order in NO. Write down the form of the experimentally-...
Wednesday, April 11, 2012 at 4:59pm by Kenzie

Chemistry
Please help me on this for my Midterm Review thank you very much... 1.For the reaction 2N2O(g) &#8651; O2(g) + 2N2(g), what happens to the equilibrium position if the pressure decreases? A. Shift to the right B. Shift to the left C. Doubles D. Does nothing E. Halves 2....
Tuesday, October 16, 2012 at 9:25pm by Jessie

chemistry
Consider the 2-step reaction mechanism fast 2NO + H2 \$ N2O+H2O slow N2O+H2 ! N2+H2O net 2NO + 2H2 ! N2 + 2H2O Which of the following rate laws is cor- rect for the given mechanism? Note that the constant k may represent a combination of elementary reaction rate constants.
Monday, January 10, 2011 at 10:04pm by Anonymous

chemistry
Consider the 2-step reaction mechanism fast 2NO + H2 \$ N2O+H2O slow N2O+H2 ! N2+H2O net 2NO + 2H2 ! N2 + 2H2O Which of the following rate laws is cor- rect for the given mechanism? Note that the constant k may represent a combination of elementary reaction rate constants.
Monday, January 10, 2011 at 10:04pm by Anonymous

Chemistry
For the following reaction at a certain temperature: 2( ) 2( ) ( ) 2 H F HF g g g +  it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2]=0.0500 M, [F2]=0.0100 M, and [HF]=0.400 M. If 0.200 mol F2 is added to this equilibrium mixture, ...
Wednesday, April 3, 2013 at 9:04pm by Jerry

Temperature, pressure, surface area (if a surface reaction), concentrations of reactants, presence of catalysts, presence of reaction inhibitors, rate of diffusion (mixing of reactants)
Thursday, January 14, 2010 at 10:46pm by drwls

Chem
Higher concentrations mean more molecules that can bump into each other and that increases the reaction rate probability.
Monday, March 1, 2010 at 11:00pm by DrBob222

chemistry reaction rate
You will need to add a catalyst. 'nic' is not correct as changing the P or concentrations will only change the position of the equilibrium. Increasing the temperature will bring the reaction to equilibrium more quickly, but will decrease the equilibrium yield as it is ...
Sunday, January 9, 2011 at 8:52pm by Dr Russ

chemistry
(B) is not in the rate expression; therefore, changing (B) will not affect the rate. If the rate order for A is 1, the answers are the same. If the rate order of A is 0, the rate doesn't depend on A or B.
Thursday, November 18, 2010 at 1:23pm by DrBob222

Chem
Determine the concentrations of K2SO4, K , and SO42– in a solution prepared by dissolving 2.84 × 10–4 g K2SO4 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (...
Tuesday, February 19, 2013 at 5:15pm by Jhanvi

Chemistry/Equilibrium calculations
I want to add a comment about the second question: CO concentration being decreased or increased by a CATALYST... Catalysts do not change the equilibrium concentration, they may speed it up, or reduce the activation energy, or make it more efficient, but not change the final ...
Saturday, August 16, 2008 at 7:59am by bobpursley

chemistry
A catalyst alters the rate of a reaction by a. changing the products in the reaction. b. increasing the activation for the reaction. c. always providing a surface on which the molecules react. d. providing an alternate pathway for the reaction. e. increasing the concentrations...
Friday, February 24, 2012 at 8:23pm by bob

chemistry(just need to clarify, no need to solve)
A+B&gt;&lt;C+D A and B are reacting to make C and D. C and D are reacting to make A and B. When the reaction rates both ways are the same, or equal, the reaction is said to be in equilibrium. The equilibrium concentrations are the moles of A, B, C, and D divided by ...
Monday, April 12, 2010 at 1:37am by bobpursley

government
et, or dd, or dt, or ee, or tt, or ivy, or whoever, The president doesn't make laws. Congress does that. The president can suggest or propose laws, can sign them or veto them, but he doesn't make laws.
Saturday, November 22, 2008 at 6:09pm by Writeacher

Chemistry
I've gotten so far, but am still unsure of how to proceed. Please correct me if I am wrong: I know that since the concentrations of the base/acid are the same, the log(1) is 0, so the pH = pKa. I determined the Kb by finding the Ka and using the Kw relationship. I have a ...
Tuesday, February 23, 2010 at 10:56pm by Bodhi

chemistry
What is the rate? You don't list the rate or rate constant and I don't see any way to calculate the rate.
Sunday, February 21, 2010 at 9:42pm by DrBob222

Chemistry
1) Consider again the definition of Keq. The concentrations of products appear in the numerator, and the concentrations of reactancs appear in the numerator. If Keq increases, the concentrations of products must increase. 2) Correct 3) Apply Le Chatelier's principle here. ...
Monday, December 24, 2007 at 3:42am by drwls

chemistry
The equation A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a. rate = k(A]2 b. rate = k(B]2 c. rate = k(A][B] d. rate = k(A][B]2 e. none of the above represents the rate law for this elementary reaction. help
Saturday, February 25, 2012 at 10:09am by bob

chemistry
The equation A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a. rate = k(A]2 b. rate = k(B]2 c. rate = k(A][B] d. rate = k(A][B]2 e. none of the above represents the rate law for this elementary reaction.
Friday, February 24, 2012 at 8:19pm by bob

college chemistry
You are given solutions of HCl and NaOH and must determine their concentrations. You use 38 mL of NaOH to titrate 100 mL of HCl and 23.2 mL of NaOH to titrate 50 mL of 0.0782 M H2SO4. Find the unknown concentrations.
Sunday, October 3, 2010 at 3:06pm by KELLY

Chemistry
If Kc = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M, respectively. a. [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M b. [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M c. [C6H12] = 0.241 M...
Sunday, January 30, 2011 at 4:28pm by bob

Chemistry
The reaction between NO (nitric oxide) and oxygen is a key step in the formation of acid rain. O2(g) + 2NO(g) &#8594; 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

Chemistry
For the reaction below at a certain temperature, it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.340 mol of F2 is added to this equilibrium mixture, calculate the concentrations of all ...
Monday, February 20, 2012 at 9:11pm by Elizabeth

chemistry
I hope this will help us figure out now For questions #1 through #10, refer to the following equilibrium system, with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O(aq)----&gt; C7H16O2 (aq) + 2H2O (l) 1. What is the equilibrium expression for this system? [C7H16O2]/ [C3H6O][C2H6O]2...
Monday, April 23, 2012 at 8:22am by cateye

Chemistry.. kinetics
Initial rate Average rate instanteneous rate Which of these would have the highest value? Explain Please? Which one of these is typically used to determine the rate law for a reaction?
Tuesday, July 21, 2009 at 5:39pm by Sunshine

Chemistry
Consider the equilibrium 2NO (g) &lt;---&gt; 2NO (g) + Cl2 (g). In a 1 L container @ equilibrium there are 1.0 mol NOCL, 0.70 mol NO, and 0.40 mol Cl2. @ constant temperature and volume, 0.10 mol NaCl is added. What are the concentrations in the "new" ...
Friday, April 12, 2013 at 11:22pm by Anna

hcs/341
so even though we may find these things a a problem and waste of time to use these laws ands regulations are good so that the company, customers etc. do not get sued for not following the laws? so i woulod agree because it makes common sense to do it but it is taken over by if...
Monday, March 21, 2011 at 8:52pm by bobbi

chemistry
I have gotten the equilibrium concentrations of N202 to be 2M and N02 to be 2M also. After equilibirum is reached, a pistons is used to decrease the flask volume to 3L. Once equilibrium is established find the concentration and moles of each gas. K = 2 How would I set up my ...
Thursday, October 9, 2008 at 1:00am by A

Chemistry
Voltaic cell. The initial concentrations of Ni2+ and Zn2+ are 1.50 M and 0.100 M. Initial cell potential=.56 V. What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.45 V?
Friday, July 30, 2010 at 6:51pm by Danielle

science/ chemistry
Over 80 000 vehicles per day pass the site and the traffic is frequently congested. The surrounding area is described as forming a street canyon. The temperature at the site had reached 25 °C by 08:00, when the ethane concentration was recorded as 7.09 ppbv. This is ...
Sunday, September 14, 2008 at 4:36pm by Nicolas

history
Ideas for bills and laws come from citizens. If enough support is shown, then legislators propose and enact these laws. Also (sadly) -- many ideas for laws come from lobbyists who want to promote specific industries or special interests. To which groups of people do you refer?
Wednesday, February 27, 2008 at 8:43pm by Ms. Sue

Chemistry
I posted a question like this but my numbers were actually wrong. These are the correct ones. 5.94e-3 / 1.11e-3 = 5.33e-2/2.66e-2 5.35 = 2.00^m I guess this is not correct because I do not know a whole number that will give you 5.35. Chemistry - DrBob222, Tuesday, February 28...
Tuesday, February 28, 2012 at 9:59pm by Hannah

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