Thursday

April 17, 2014

April 17, 2014

Number of results: 68,279

**math help**

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
*Wednesday, June 26, 2013 at 9:52am by Tracy *

**Rate Constant - My Work is Incorrect**

Hi! I am stuck with this question and I would like to know what I did wrong: Given that the initial rate constant is 0.0160 s-1 at an initial temperature of 25 degrees C, what would the rate constant be at a temperature of 130 degrees C for the same reaction described in Part ...
*Sunday, February 3, 2013 at 3:26pm by Amy*

**Chemistry**

1) Gases are not included in the equilibrium constant expression.They are included so this is incorrect. 2) Equilibrium constant can be increased by adding a catalyst.They can not be changed by adding a catalyst so this is incorrect 3) Large equilibrium constant favors ...
*Saturday, March 17, 2012 at 7:01pm by DrBob222*

**math**

Can someone please help me on these I have look at the examples and done just what they did, but I still get it wrong and I only have one more time to try. Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9...
*Sunday, June 23, 2013 at 8:57pm by tracy12*

**physics6**

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.2 multiplied by 10-17 N during the first 2.2 cm of the tube's length; then they move at essentially constant velocity another 43 cm before hitting the screen. (a) Find the ...
*Thursday, February 16, 2012 at 3:53pm by Anonymous*

**physics14**

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.2 multiplied by 10-17 N during the first 2.2 cm of the tube's length; then they move at essentially constant velocity another 43 cm before hitting the screen. (a) Find the ...
*Thursday, February 16, 2012 at 8:07pm by jm*

**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 *

**music PLZ HELP CHECK MY ANSWERS**

-------------------------------------------------------------------------------- Question Number Your Answer Answer Reference...
*Tuesday, August 9, 2011 at 8:08pm by Anonymous*

**rate constant**

A reaction has a rate constant of 1.25×10−4 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**

What is the rate of the following reaction (M/s) if the rate constant for the reaction is 0.500 L•mol-1•s-1 and the concentration of each reactant is 0.0628 M. (The units for the rate constant depend upon the rate law). CO + NO2 --> CO2 + NO
*Saturday, November 20, 2010 at 10:35pm by Confused*

**statistics**

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 1 3 1 6 3 6 1 4 4 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
*Friday, November 1, 2013 at 3:46am by statistics student*

**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*

**calculus**

Maximize p = 2x + 2y subject to 4x + 8y 24 8x + 4y 32 x 0 , y 0 (Round all answers to the nearest 0.1.) p = Incorrect: Your answer is incorrect. x = Incorrect: Your answer is incorrect. y = Incorrect: Your answer is incorrect.
*Sunday, November 13, 2011 at 9:38pm by LC*

**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*

**Math**

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) (my answer was 100.9...
*Wednesday, May 29, 2013 at 10:52pm by DeeDee*

**ALGEBRA**

If the principal P = $500, the rate r = 5 1 2 %, and time t = 1 year, find the following. (a) What is the amount of interest? $ Incorrect: Your answer is incorrect. (b) What is the future value?
*Wednesday, April 25, 2012 at 8:51pm by Randy*

**physics**

Vector V1 is 8.58 units long and points along the -x axis. Vector V2 is 4.45 units long and points at +40.0° to the +x axis. (a) What are the x and y components of each vector? V1x = Incorrect: Your answer is incorrect. V1y = Incorrect: Your answer is incorrect. V2x = ...
*Tuesday, September 25, 2012 at 6:35pm by royaa*

**physics**

The speed of a point on a rotating turntable, which is 0.264 m from the center, changes at a constant rate from rest to 0.902 m/s in 1.94 s. At t1 = 0.64 s, find the magnitude of the tangential acceleration. Answer in units of m/s2 I assumed the velocity was constant so i ...
*Friday, September 9, 2011 at 6:13pm by squires*

**physics**

The speed of a point on a rotating turntable, which is 0.264 m from the center, changes at a constant rate from rest to 0.902 m/s in 1.94 s. At t1 = 0.64 s, find the magnitude of the tangential acceleration. Answer in units of m/s2 I assumed the velocity was constant so i ...
*Saturday, September 10, 2011 at 11:21am by squires*

**physics**

The speed of a point on a rotating turntable, which is 0.264 m from the center, changes at a constant rate from rest to 0.902 m/s in 1.94 s. At t1 = 0.64 s, find the magnitude of the tangential acceleration. Answer in units of m/s2 I assumed the velocity was constant so i ...
*Monday, September 12, 2011 at 10:21pm by squires*

**physics**

The speed of a point on a rotating turntable, which is 0.264 m from the center, changes at a constant rate from rest to 0.902 m/s in 1.94 s. At t1 = 0.64 s, find the magnitude of the tangential acceleration. Answer in units of m/s2 I assumed the velocity was constant so i ...
*Monday, September 12, 2011 at 10:21pm by squires*

**Chemitry **

The reaction rate is assumed to be of the form Rate = Constant * e^(-Ea/RT) where T must be in Kelvin Rate(75C)/Rate(45C) = e^-[Ea/348R - Ea/318R] where R = molar gas constant = 8.317 J/(mol*K) and Ea = 4860 J/mol is the activation anergy Rate(75C)/Rate(45C) = e^[(Ea/k)(1/318...
*Saturday, December 25, 2010 at 1:13pm by drwls*

**basic dressmaking processes**

1.A Correct 2.D Incorrect PAGES 1-2 3.B Incorrect PAGE 5 4.C Incorrect PAGE 8 5.A Correct 6.D Correct 7.C Incorrect PAGE 18 8.B Incorrect PAGE 32 9.C Incorrect PAGE 37 10.D Correct 11.C Incorrect PAGE 39 12.C Incorrect PAGE 44 13.A Correct 14.B Correct 15.D Correct 16.C ...
*Tuesday, August 30, 2011 at 3:22pm by Jasmine*

**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...
*Tuesday, May 18, 2010 at 11:15am by anonymous*

**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...
*Tuesday, May 18, 2010 at 11:20am by anonymous*

**CHEM**

Which of the following will be affected by the addition of a catalyst to a chemical reaction? Choose all that apply. thanks A)the magnitude of the equilibrium constant B) the value of the ratio kf/kr C) ÄHo D) ÄSo E) the value of the forward rate F) the value of the reverse ...
*Saturday, May 29, 2010 at 12:11pm by Adam*

**Chemistry**

Which of the following will be affected by the addition of a catalyst to a chemical reaction? a. ÄGo b. the value of the reverse rate constant, kr c. the value of the reverse rate d. the value of the ratio kf/kr e. the value of the forward rate f. the value of the forward rate...
*Sunday, May 30, 2010 at 12:18am by John*

**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*

**MATH**

what is a constant rate of change? That means the velocity changes over time in the same manner. 4,800 +3,700 =4,500 Rate of Change Is Constant You can increase or decrease the amount or concentration of a species by a constant value using a zero order rule. For example, the ...
*Tuesday, January 9, 2007 at 4:52pm by Austin*

**7th grade Science**

rate*wavelength=constant and the constant is the velocity of propagation. if rate is increased, then wavelenght will decrease.
*Tuesday, November 11, 2008 at 7:35pm by bobpursley*

**SCIENCE --- CHECK MY WORK PLS**

1. Incorrect. It is splitting water into hydrogen and oxygen. 2. Correct 3. Incorrect. They can be combined in many ways.
*Monday, February 3, 2014 at 11:48am by Anonymous*

**calculus**

Boyle's law states that if the temperature of a gas remains constant, then PV = c. Where P is the pressure, V is the volume, and c is a constant. Given a quantity of gas at constant temperature, if V is decreasing at a rate of 13 in.^3/s, at what rate is P increasing when P = ...
*Sunday, May 2, 2010 at 11:38pm by Hussain*

**Chemistry**

calculate the rate constant at 225C for a reaction that has a rate constant of 8.1X10^-4 at 95c and an activation enegry of 93.0 kj/mol
*Saturday, June 8, 2013 at 7:39am by Jason*

**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(check my answer)**

Which of the following will be affected by the addition of a catalyst to a chemical reaction? a)the value of the reverse rate constant, kr b)the magnitude of the equilibrium constant c)the value of the forward rate d)ΔHo e)the value of the forward rate constant, kf f)&#...
*Friday, May 14, 2010 at 2:32am by eng*

**math**

Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (a) Construct a scatter diagram of the given bivariate data. (Do this on paper. Your instructor may ask you to turn in this work.) (b) Calculate the covariance. (Give ...
*Tuesday, June 25, 2013 at 10:49am by tracy12*

**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*

**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 10^-1 (a) ...
*Wednesday, January 30, 2013 at 5:55pm by Hannah*

**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.) Hint: The...
*Wednesday, November 10, 2010 at 4:38pm by sparkle*

**Chemistry**

IT doesn't tell me anything. WHAT is incorrect? What number did you get? If you used my numbers I'm not surprised it (the answer you obtained) is incorrect. Did you read where I said it was approximate? Did you work it out from the beginning. Probably not.
*Wednesday, March 26, 2014 at 10:53pm by DrBob222*

**Algebra 1**

using a constant rate, you can saw a log into 3 pieces in 12 minutes. At the sam constant rate, how long will it take you to cut a siliar log (if the same size) into 6 pieces? would you do a rate formula or what? I'm really stuck on this one!
*Tuesday, May 20, 2008 at 5:59pm by Libby*

**Chemistry**

2A-->B+C given that the initial concentration of A is .022M and that at 69 s, the concentration of B increases to .0095M, what is the rate constant? i know I need to find the new concentration of A at 69s, but I am having trouble with findthing this. I thought it might be ...
*Wednesday, March 31, 2010 at 9:52pm by Val*

**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(check my answer)**

the value of the forward rate constant (kf), the value of the reverse rate constant (kr), the value of the forward rate, and the value of the reverse rate
*Friday, May 14, 2010 at 2:32am by uci student*

**chemistry**

You mix together in the proper manner the following VOLUMES: 0.0100 M Potassium iodide...9.2 mL 0.0010 M Sodium thiosulfate...6.5 mL Distilled water...16.8 mL 0.0400 M Potassium Bromate...13.9 mL 0.100 M Hydrochloric acid...6.1 mL Using the rate constant and rate equation ...
*Saturday, March 2, 2013 at 10:01pm by Cassie*

**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**

A second-order reaction has a rate constant of 1.65 M–1 s–1. If the initial reactant concentration is 1.0 M, calculate the time (in seconds) required for the reaction to become 90% complete. i got 0.06734 seconds but thats incorrect i have no idea what i am doing wrong! HELP!!!!
*Wednesday, March 28, 2012 at 9:02pm by Maya *

**business**

You have recently learned that the company where you work is being sold for $275,000. The company’s income statement indicates current profits of $10,000 which have yet to be paid out as dividends. Assuming the company will remain a “growing concern” into the infinite future ...
*Saturday, January 7, 2012 at 7:44pm by john*

**Grammar question**

1. incorrect 2. correct 3. correct 4. correct 5. correct 6. incorrect 7. incorrect 8. I would say "careers" since the reference is to "employees' careers" - but there's no pronoun error here. 9. incorrect 10. incorrect 11. correct
*Tuesday, August 12, 2008 at 7:28pm by Writeacher*

**Physics**

All answers should be in degrees. (a) Using the result of Lecture 31 Question 3, and Snell's law, derive and evaluate for the secondary rainbow for the following values of the incidence angle and index of refraction . 1 , 1.4 incorrect 45 , 1.3 incorrect 87 , 1.55 incorrect (...
*Wednesday, June 5, 2013 at 6:02am by P*

**chemistry**

For a certain chemical reaction, the rate constant at 250.0 °C is 0.00383 s-1 and the activation energy is 22.40 kilojoules. Calculate the value of the rate constant at 335.0 °C. a. 0.00513 s-1 b. 0.00946 s-1 c. 0.00787 s-1 d. 0.0224 s-1 e. 0.000640 s-1 b or c
*Friday, February 24, 2012 at 7:54pm by bob*

**Chemistry**

2 and 3 are correct. 1 is correct if you are discussing the reaction rate at constant pressure, but at constant volume the collision rate does increase slowly with temperature (in proportion to sqrt T)
*Thursday, December 20, 2007 at 4:01am by drwls*

**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*

**Physics**

A 5.50-kg ball, moving to the right at a velocity of +2.35 m/s on a frictionless table, collides head-on with a stationary 7.60-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 5.5-kg ball = Incorrect: Your answer is ...
*Tuesday, March 26, 2013 at 10:20am by Anonymous*

**Chemistry**

1) Three factors control the rate of evaporation of a liquid: surface area, temperature, and strengths of intermolecular forces. More than one of the statements given described a correct effect. The statements are (1) the larger the surface area, the faster the rate of ...
*Monday, January 30, 2012 at 3:44pm by Hannah*

**math(need to know if i worked this right)**

Your lack of brackets make the order of operation incorrect. Here is probably what you meant (x-3)/3 - (x-2)/5 =(5(x-3) - 3(x-2))/15 = (5x-15 - 3x+6)/15 = (2x - 9)/15 notice your constant in the last line is incorrect
*Wednesday, April 9, 2008 at 10:45am by Reiny*

**physics**

The half life of C=14 is 5730 years. A living organism has a decay rate of 15.2 decays per minute per gram. You have a 55 gram sample; therefore, 55 g x 15.2 d/min*g = 836 d/min for the 55 g sample. That's the initial rate or Ro. ln(Ro/R) = kt So Ro is the intial rate from ...
*Monday, May 5, 2008 at 9:13pm by DrBob222*

**chemistry**

The reaction 2NOCl(g) ¨ 2NO(g) + Cl2 (g) has an activation energy of 100.0 kJ/mol and a rate constant at 350.0 K of 8.5 x 10-6 mol-1 L s-1. Determine the rate constant at 400 K.
*Tuesday, February 9, 2010 at 11:04pm by G-Unit 32*

**chemistry**

The reaction A + B + C = products has a rate law rate = kA]C]2. 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 a. only one of these (...
*Friday, February 17, 2012 at 9:35pm by elvis*

**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**

the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^-7 L/mol*s. What is the rate constant at 645K? Please Show all Steps! thank you!
*Tuesday, October 26, 2010 at 7:03pm by Jack*

**chemistry**

calculate the rate of a constant reaction at 293 kelvin when the energy of activation is 103 kilo joules per mole and the rate constant at 273 kelvin is 7.87*10 to the power -7...
*Thursday, January 24, 2013 at 3:14am by Emeldah*

**chemistry**

calculate the rate of a constant reaction at 293 kelvin when the energy of activation is 103 kilo joules per mole and the rate constant at 273 kelvin is 7.87*10 to the power -7...
*Thursday, January 24, 2013 at 3:14am by Emeldah*

**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*

**chemistry**

The rate CONSTANT changes with T but it does not change with the addition of a catalyst or changing concn. Adding a catalyst WILL change the rate (but not the constant) and changing the concn of C WILL change the rate but not the constant.
*Friday, February 17, 2012 at 9:35pm by DrBob222*

**Economics**

“Many countries peg their own currencies to the greenback; these countries import U.S. inflation when the Fed makes a mistake.” Why would these countries “import” inflation. A. this is incorrect because countries only import goods or services B. this is correct because a fixed...
*Sunday, March 27, 2011 at 10:10am by CLA*

**Chemistry(Please check)**

there is a difference between the rate constant, and the rate. Changing concentration affects rate.
*Sunday, February 19, 2012 at 6:07pm by bobpursley*

**Math**

What can be added is the rate of work. This is how much work each finishes in an hour. Ben's rate + Ted's rate = 1/6+1/11 = 17/66 Together they do 17/66 of the work in an hour. So time it takes to get the work done = 1/(17/66) = 66/17 = 3 15/17 hours
*Sunday, June 12, 2011 at 7:40pm by MathMate*

**Steve 3 more questions.**

Andre drove 378 miles in 7 hours. A.Find the unit rate in miles per hour.Show your work. B.Find the unit rate in miles per minute.Show your work. C.Find the unit rate in miles per second.Show your work. D.Use one of your unit rate answers from parts a-c to find Andres rate in ...
*Tuesday, October 30, 2012 at 6:55pm by misty*

**Chemistry**

A will work IF the reactants are gases. B will work because it gives the molecules more energy. C will work to increase the rate of reaction because the activation energy is lowered. D generally decreases the rate.
*Wednesday, February 9, 2011 at 9:13am by DrBob222*

**chemistry-rate of reaction**

rection rate=rate constant * conc^2
*Sunday, December 2, 2012 at 12:07am by qwerty*

**Reaction rates**

The reaction, C2H5Br --> C2H4 + HBr, has a rate constant k = 0.0000100 s-1 at 363 °C and k = 0.000479 s-1 at 427 °C. What is the rate constant for the reaction at 725 K? Round your answer to 3 significant figures.
*Saturday, November 20, 2010 at 10:37pm by Confused*

**Chemistry **

Decomp. of H2O2 with Catalase.I am trying to use the Arrhenius equation in my coursework, but i am struggling to get it to work. I have substituted most of the information in, such as activation energy(23000J), and gas constant(8.314x10-3) etc. The issue is "A" which is the ...
*Sunday, February 27, 2011 at 11:36am by Suriya *

**chem**

We can treat the equilibrium constant as the ratio of the forward rate constant, kfwd, with respect to the reverse rate constant, krev. That is: Keq = kfwd / krev. Which statement is true? a) kfwd > krev b) kfwd < krev The answer is A but how would you explain why that ...
*Wednesday, April 27, 2011 at 9:07pm by Adam*

**calculus**

a 20 ft ladder is leaning against a wall. The bottom is being pulled out at a constant rate of 2.5 ft/sec. Will the top of the ladder clide sown thr wall at a constant rate? What will the rate be? In relation to time? It is not constant. Use pythagorus: x^2 + y^2 = l^2, where ...
*Thursday, October 12, 2006 at 6:45pm by Suzy*

**8th grade**

constant rate of change. constant speed is constant change of distance/time so if you are going 25mph, your distance is changing at a constant 25miles each hour.
*Wednesday, December 1, 2010 at 7:50pm by bobpursley*

**CHM 152**

The activation energy for a reaction is 37.6 kJ/mole. The rate constant for the reaction is 5.4 x 10-3 s-1 at 45 oC, Calculate the rate constant at 145 oC.
*Thursday, June 10, 2010 at 9:40pm by Car*

**chemistry**

the rate constant for the reaction is 0.152 s_-1 at 27 degree the rate constant increases to 0.304 s _-1 at 37 degree whta is the value of energy of activiation for the reaction?
*Monday, March 28, 2011 at 12:12pm by dea*

**Math Quadratic Equations**

You score 1/4 1C incorrect 2B incorrect 3A correct 4C incorrect
*Sunday, September 8, 2013 at 8:18am by Graham*

**chemistry**

The rate constant of the reaction between CO2 and OH - in aqueous solution to give the HCO3- ion is 1.5 1010 1/(M·s) at 25°C. Determine the rate constant at blood temperature (37°C), given that the activation energy for the reaction is 38 kJ/mol. units 1/(M·s)
*Tuesday, June 12, 2012 at 6:50pm by parker*

**algebra**

A principal of $5000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate? i know this is 1.5 % or at least I think it is but how do i write it out? Use the equation I=Prt, where I=interest earned, P=...
*Wednesday, May 30, 2007 at 12:04am by confused*

**Chemistry**

An atmospheric scientist interested in how NO is converted into NO2 in urban atmospheres carries out two experiments to measure the rate of this reaction. The data are tabulated below. A: [NO]0 = 9.63 × 10-3 M, [O2]0 = 4.1 × 10-4 M t(s) 0/3.0/6.0/9.0/12.0 [O2] 4.1/2.05/1.02/0....
*Thursday, February 23, 2012 at 1:05pm by help*

**Chemistry **

An atmospheric scientist interested in how NO is converted into NO2 in urban atmospheres carries out two experiments to measure the rate of this reaction. The data are tabulated below. A: [NO]0 = 9.63 × 10-3 M, [O2]0 = 4.1 × 10-4 M t(s) 0/3.0/6.0/9.0/12.0 [O2] 4.1/2.05/1.02/0....
*Sunday, March 2, 2014 at 2:51pm by Serena*

**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*

**calc**

2- The earth’s atmospheric pressure p is often modeled by assuming that the rate dpdhat Which p changes with the altitude above sea level is proportional to hp. Suppose that the pressure at sea level is 1013 millibars (about 14.7 pounds per square inch) and that the pressure ...
*Tuesday, April 10, 2007 at 11:52pm by barb*

**physics**

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length scripted l = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ...
*Monday, June 3, 2013 at 12:51pm by Melissa*

**Kinetics Problem I**

A reaction has a rate constant of 1.23×10-4 s at 28 degrees C and 0.235 s at 79 degrees C. A: Determine the activation barrier for the reaction. B: What is the value of the rate constant at 15 degrees C?
*Wednesday, January 30, 2013 at 12:51am by Amy*

**Chemistry**

the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^-7 L/mol*s. What is the rate constant at 645K? Please show all steps USING THE ARRHENIUS EQUATION. Here is my work so far: K = A e^(-Ea/RT) 3.52 x 10^-...
*Tuesday, October 26, 2010 at 9:00pm by Jim*

**English**

1. incorrect 2. correct 3. incorrect 4. correct 5. probably correct; I'd also call it a dangling modifier!! 6. incorrect 7. incorrect 8. correct
*Tuesday, April 12, 2011 at 2:53pm by Writeacher*

**Statistics**

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...
*Sunday, May 26, 2013 at 12:06pm by Tom*

**statistics**

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...
*Sunday, May 26, 2013 at 10:58am by Tom*

**Arrhenius Reaction**

The activation energy of a certain reaction is 32.9 kJ/mol At 25 degrees C the rate constant is 0.0160 units s-1 units. At what temperature in degrees Celsius would this reaction go twice as fast? Given that the initial rate constant is 0.0160 s-1 at an initial temperature of ...
*Wednesday, January 30, 2013 at 12:29am by Amy*

**chemistry**

The rate constant for this reaction was found to be 0.00550 s-1. What is the instantaneous rate of reaction when the concentration of dinitrogen pentoxide is 0.100 M? Rate = k[N2O5].
*Thursday, April 26, 2012 at 5:15pm by Anonymous*

**computers**

Problem Solving INCORRECT PAY RATE: Recently you received a promotion that indicated a pay raise. You log into your company portal and verify that your rate of pay has increased. After receiving your next paycheck, however, you realize that you were paid at the previous rate ...
*Friday, April 26, 2013 at 4:56pm by Anonymous*

**Chemistry**

Think about this. Then let us know what you think and why! The answer should be obvious if you think about it. A liquid in a stoppered flask is allowed to stand at constant temperature entil the liquid level in the flask remains constant. which condition then exists in the ...
*Monday, March 26, 2007 at 9:39pm by DrBob222*

**Chemistry**

For the reversible, one-step reaction A + B ARROW C + D, the forward rate constant is 35.9 1/(M·h) and the rate constant for the reverse reaction is 25.4 1/(M·h). The activation energy was found to be 33.0 kJ/mol for the forward reaction and 45.6 kJ/mol for the reverse ...
*Wednesday, June 13, 2012 at 9:50pm by parker*

**Temperature Problem**

Q: A reaction rate has a constant of 1.23 x 10-4/s at 28 degrees C and 0.235 at 79 degrees C. Determine the activation barrier for the reaction. A: My work thus far: ln(1.23 x 10-4/0.235)=(Ea/8.314)(1/301.15-1/352.15) -7.551=(Ea/8.314)(0.0048090535) -7.551=(Ea/8.314)(0....
*Saturday, February 2, 2013 at 10:16am by Amy*

**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 *

**Math**

Another approach might be to work work the problem backwards. For a third degree polynomial, Q''' is just a constant. Set that to 12. Inegrate to get Q'' =12x + C Adjust the constant for the desired result. Repeat for Q' and Q.
*Friday, February 29, 2008 at 11:29am by Quidditch*

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