# Rate Constant - My Work is Incorrect

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### 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 ...

### 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 ...

### Calculus

y = f(x) = x^2 - 3 x (a) Find the average rate of change of y with respect to x in the following intervals. from x = 2 to x = 3 Incorrect: Your answer is incorrect. from x = 2 to x = 2.5 Incorrect: Your answer is incorrect. from x = 2 to x = 2.1 Incorrect: Your answer is ...

### 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...

### math

The table shows the position of a cyclist. t (seconds) 0 1 2 3 4 5 s (meters) 0 1.4 5.4 10.8 17.4 24.6 (a) Find the average velocity for each time period. (i) [1, 3] 4.45 Incorrect: Your answer is incorrect. m/s (ii) [2, 3] 5.5 Incorrect: Your answer is incorrect. m/s (iii) [3...

### 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...

### 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 ...

### 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 ...

### 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 ...

### Elementary Satistics

Test the following function to determine whether it is a probability function. If it is not, then make it into a probability function. (Give your answers correct to one decimal place.) R(x) = 0.2, for x = 0, 1, 2, 3, 4 (a) List the distribution of probabilities. R(0) =0 ...

### 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...

### 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 = ...

### 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.

### Chemistry

A student tested the effect of temperature on the decomposition of N2O5. He found that the rate of the reaction at a lower temperature was 4.2 x 10–3 s–1 and the rate at a higher temperature was 1.6 x 101 s–1. What is wrong with the student's data? A. Nothing. Rate ...

### science

If a reaction rate increases with temperature, how will the rate constant of the reaction change with temperature? A. The rate constant only changes upon addition of a catalyst to the reaction. B. The rate constant will decrease with temperature. C. The rate constant will not ...

### chem

If a reaction rate increases with temperature, how will the rate constant of the reaction change with temperature? A. The rate constant only changes upon addition of a catalyst to the reaction. B. The rate constant will decrease with temperature. C. The rate constant will not ...

### Math

What is the value of a stock that grows at a supernormal rate of 18% for the first four years, and then slows down to a constant growth rate of 10%? An annual dividend of $2.00/share was just paid, and the rate of return on common stock is 13%. Possible Solution: For a ...

### 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 ...

### 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?

### 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 ...

### 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 ...

### 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 ...

### 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 ...

### 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 ...

### 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 ...

### 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 ...

### chemistry

A certain first order reaction has a rate constant of 5.68 x 10–3 s–1 at 139°C and a rate constant of 8.99 x 10–1 s–1 at a temperature of 215°C. Ea = 111 kJ mol– q1) What is the value of the rate constant at 275°C? q2) At what temperature does the rate ...

### Accounting

How can I find the supernormal growth rate and constant growth rate of a stock? V = D1/k-g V = the value of the stock D1 = the dividend next period k = the required rate of return g = constant growth rate I'm confused on how to combine the constant growth rate formula with the...

### physics

A 5.3-kg block is pushed 2.3 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of θ = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction between block and wall is 0.30, determine the...

### French, foreign language

Hi, I need help with answering some questions for French Here's my work on them tell me what you came up with for each question that is incorrect: 1.C'est un plat typiquement français. On les prépare avec du beurre et de l'ail. Ce sont un escargot (incorrect) 3.Ce sont des l...

### physics

1.) A 7159 N piano is to be pushed up a(n) 2.26 m frictionless plank that makes an angle of 25.6 degrees with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J. 2.) A 20 g bullet is accelerated in a rifle ...

### 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/...

### 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/...

### 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 (b...

### 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...

### 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

### Statistics

A sample of 148 values is randomly selected from a population with mean, μ, equal to 46 and standard deviation, σ, equal to 17. (Give your answers correct to one decimal place.) (a) Determine the interval (smallest value to largest value) within which you would ...

### 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)) Incorrect: Your ...

### Math PLEASE help

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 ...

### 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?

### 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....

### 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 ...

### 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 ...

### 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 × 10-1 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/...

### chemistry

Which of the following sets of quantum numbers are not allowed. For each incorrect set, state why it is incorrect. For each correct set, name the atomic orbital. i. n=4, l=3, ml =2, ms =-1/2 ii. n=2, l=1, ml =-1, ms =-1 iii. n=5, l=-4, ml =2, ms =+1/2 can you guys help me my ...

### 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

### Calculus

Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 7.5 mi^2/hr. How rapidly is radius of the spill increasing when the area is 8 mi^2? I tried using A=(pi)r^2 and dA/dt=2(pi)r(dr/dt) and plugging in 7.5=2(pi)8(dr/dt) but the ...

### chemistry

Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...

### chemistry help?!

Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...

### science

Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...

### 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...

### 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 ...

### Temperature

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)(1/79-1/28) -7.551=(Ea/8.314)(0.01265-0.03571) -7.551=(Ea/8.314)(-0.02305) 327....

### 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...

### 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...

### Physics

Three parallel plate capacitors (C1,C2 and C3 ) are in series with a battery of 100 V. C1=2500 micro Farad; C2=2C1 , C3=3C1 . (a) What is the potential difference over each capacitor and how much charge is on each capacitor? Across C1 :V1 (in Volts) = incorrect Q1 (in C) = ...

### 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 ...

### 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 that's incorrect i have no idea what i am doing wrong! ...

### ECON

You’ve recently learned that the company where you work is being sold for $500,000. The company’s income statement indicates current profits of $25,000, which have yet to be paid out as dividends. Assuming the company will remain a “going concern” indefinitely and that...

### 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^-7...

### 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 ...

### 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 ...

### 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 ...

### 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)&#...

### 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 ...

### 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 ...

### math answer check

x is a binomial random variable. (Give your answers correct to three decimal places.) (a) Calculate the probability of x for: n = 1, x = 0, p = 0.15 P(x) = Changed: Your submitted answer was incorrect. 0.15 x 0 = 0 . (b) Calculate the probability of x for: n = 3, x = 3, p = 0....

### AP physics c

A helicopter lifts a 63 kg astronaut 10 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? Incorrect: Your answer is incorrect. J (b) How much work is done on ...

### Chemistry

A reaction has a standard free-energy change of –10.30 kJ mol–1 (–2.462 kcal mol–1). Calculate the equilibrium constant at 25ºC.? This is what I've done so far.. ∆Gº= -2.3 RT + log (K) -10.31 kJ = -2.3 (.0083145)(298) + log K -10.31 kJ = -2.3 (2.48) log K log K...

### 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...

### 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

### Math help

Find the 98% confidence interval for estimating ìd based on these paired data and assuming normality. (Give your answers correct to one decimal place.) Before 50 55 61 52 68 54 After 34 58 56 36 40 39 Lower Limit Incorrect: Your answer is incorrect. 64.0 Upper Limit Incorrect...

### 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 ...

### Finding the Activation Barrier

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)(1/79-1/28) -7.551=(Ea/8.314)(0.01265-0.03571) -7.551=(Ea/8.314)(-0.02305) 327....

### 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 = ...

### 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

### make check

Consider the following. (Give your answers correct to four decimal places.) (a) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.65. Incorrect: Your answer is incorrect. . 0.90 is what I got and it was wrong, I have several like this ...

### math formulas needed

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 ...

### chemistry

A reaction has a first order rate constant of 6.11x10-5 s-1 at 25C and 0.00221 s-1 at 85oC. What is the value of the rate constant at 63oC?

### 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 ...

### 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 ...

### java programming

You need to provide more than a yes or no answer for this question. Consider both the selection sort and the bubble sort. If these algorithms will work with duplicates explain why they will still work. If they will not work, explain why they will not work. If one will work and...

### Chemistry

Calculate the rate constant at 200.°C for a reaction that has a rate constant of 9.20 × 10−4 s−1 at 90.°C and an activation energy of 59.7 kJ/mol.

### 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.

### 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 ...

### gen chem

The rate constant of a first order reaction is 4.60 x 10-4 s-1 at 350 oC. If the activation energy is 104 kJ/mol, calculate the temperature in Kelvin at which its rate constant is 1.80 x 10-3 s-1.

### 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: ...

### Science

how much work is done on a 50kg cart that is pushed 10m at a constant rate of 5m/s^2

### chemistry

The first order rate constant for the decomposition of N2O2 of 0Cis 5.2*10/6 per minute. If the activation energy is 6200J/mol, calculate the rate constant at 25C

### 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=...

### 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...

### Physical Science

A 20.0-Ù resistor and a 45.0-Ù resistor in parallel are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? current through the 20.0-Ù resistor: Incorrect: Your answer is incorrect. . A current through the 45.0-Ù resistor: Incorrect: ...

### Chemistry

At 700 k the equilibrium constant Kc for the reaction between NO(g) and O2(g) forming NO2(g) is 8.7*10^6. The rate constant for the reverse reaction at this temperature is 0.54 M^(-1)s^(-1). What is the value of the rate constant for the forward reaction at 700 K?

### 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

### Chemistry

A certain reaction has an activation energy 52.93 kJ/mol. At what kelvin temperature will the reaction proceed 8.00 times faster than it did at 315K? Ea = 52.93 kJ/mol = 52930J R (gas constant) = 8.314 T1 = 315K k1 = rate constant at T1 T2 = ? k2 = rate constant at k2 = 8.00 ...

### math check

Suppose that you are in a class of 31 students and it is assumed that approximately 13% of the population is left-handed. (Give your answers correct to three decimal places.) (a) Compute the probability that exactly five students are left-handed. Incorrect: 9.936 (b) Compute ...

### Chemistry

Which statement about Kc is wrong? A. Kc is always a constant B. For some reactions, Kc increases with temperature increase C. For some reactions, Kc decreases with temperature decrease D. For some reactions, Kc changes when pressure is changed A is incorrect. Kc stays ...

### chemistry

Values of the rate constant for the decomposition of N2O5 at four different temperatures are as follows: T(K) k(s^-1) 658....2.14*10^5 673....3.23*10^5 688....4.81*10^5 703....7.03*10^5 The activation energy is 1.02*10^2 kJ/mol. Calculate the value of the rate constant at 300 K

### 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!