23 Answered Questions for the topic Kinetics

Kinetics Chemistry

02/21/22

Chemistry Kinetics

The react‎ions (CH3)3CBr+ OH-=(CH3)3COH+Br-in a certa‎in solve‎nt is fir‎st o‎rder w‎ith res‎pect to (CH3)3CBr and ze‎ro order with re‎spect to OH-. In sev‎eral experi‎ments, the rate con‎stant k... more
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Kinetics Chemistry

02/09/22

How to find activation energy (kJ/mol) given the following?
The equation of a trendline of 1/Temp (K^-1) vs. ln(1/time) --> y = -4548.6x + 10.905R = 8.314 J / k mol
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Kinetics Physics Angular

06/09/21

Angular kinetics
Suppose a person’s femoral diaphysis is idealized as a solid circular cylinder with a diameter of 2 cm. The ultimate stress in tension is 120×106 pa. Calculate the maximal tension force the femoral... more
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Kinetics Physics Angular

06/09/21

Angular kinetics
Suppose a long bone is idealized as a solid cylinder with a diameter of 0.03 m. During a torsion test, if the torsion moment is 10N.m, what is the maximal stress caused by torsion? (Hint: polar... more
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Kinetics Physics Angular

06/09/21

Angular kinetics
A man with a mass of 80 kg runs with a velocity of 3 m/s along a line tangent to a circular platform (m = 160 kg, radius r= 5 m). The platform is initially at rest and it has a moment of inertia... more
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Kinetics Physics Angular

06/09/21

Angular kinetic
A wheel with a moment of inertia of 0.03 kg.m2 is accelerated from rest to 20 rad/s in 5 seconds due to application of a moment of force (torque). When the moment of force is released, the wheel... more
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Kinetics Chemistry

04/09/21

A first order reaction has a rate constant of 4.6x10^-2/sec and 8.10x10^-2/sec at 0°C and 20°C, respectively.
What is the value of the activation energy?
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Kinetics Chemistry

04/01/21

Consider the data presented from the following reaction: A(g) —> B(g)
Consider the data presented from the following reaction: A(g) —> B(g):time(sec): 0, 40, 80, 120, 160[A](moles/liter): .100, .067, .045, .030, .020a) determine if the reaction is of the 1st order... more
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12/19/20

Chemistry - Kinetics
Fe2+ reacted much faster than C2O42- when mixed into a reaction. What can you can do to slow down the rate of reaction of Fe2+? Explain in detail the method used to slow down the reaction rate.
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12/19/20

What are some ways that companies are speeding up reactions?
I know that there could increase concentration/pressure and increase the temperature. But the question was asking for examples of ways companies speed up reactions, so I'm guessing real life examples. more
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12/04/20

Chemistry - kinetics
Describe 2 specific examples of chemical reactions you might experience in everyday life (include the reactants and products) in which being able to control the reaction rate would be beneficial.... more
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07/08/19

Why are enzyme-catalysed reactions slower at lower substrate concentration?
Suppose I'm using 200 nmoles of enzyme and 2 mmoles of substrate. The enzyme should be saturated but if I use 50 mmoles of substrate, the reaction will be faster. Why?I just can't get it! Even at... more
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Kinetics

06/19/18

A boy is standing on a bridge over a creek which flows 35 ft below. He tosses a stone right up with a velocity of 12 feet per second. How high above the water
A boy is standing on a bridge over a creek which flows 35 ft below. He tosses a stone right up with a velocity of 12 feet per second. How high above the water will the stone reach before it falls... more
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05/30/18

Is the reaction rate dependent on the concentration of the excess reagent?
If a higher concentration means a higher rate of reaction because of more collisions, then does the reaction rate depend on the concentration of the excess reagent? 
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05/25/18

Calculate the total gas pressure after one half-life?
Decomposition of N2O to N2 and O2 is a first order reaction. At 730 deg. C the half life of the reaction is 3.58 x 103 min. If the initial pressure of N2O is 2.10 atm at 730 deg. C,    a.... more
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Kinetics Chemistry

05/25/18

How long will it take the reaction to go to 95% completion?
rate constant of second order reaction is 0.80 M^-1 s^-1 Given an initial concentration of 0.086M, how long will it take for the reaction to go to 95% completion?  
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04/22/18

How long will it take for [A] to decrease from 1.63 M to 0.550 M?
The rate constant for the reaction 2A → B is 7.67 × 10−3 s−1 at 110°C. The reaction is first order in A. How long (in seconds) will it take for [A] to decrease from 1.63 M to 0.550 M?
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Kinetics Science Physics

04/15/18

Physics question
A ball in the shape of a uniform spherical shell (like a soccer ball; I = 2/3 mr2) of mass 1.5 kg and radius 15 cm rolls down a 35 degree incline that is 6.0 m high, measured vertically. The ball... more
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02/11/18

Order of Reaction and rate constant
The total pressure in atmospheres was recorded during the decomposition of acetaldehyde (CH3CHO(g)) at 701K for certain time intervals shown in the chart. Use the information to answer the... more
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05/13/17

Thermodynamics problem regarding fugacity and fugacity coefficient.
    Hey, I'm at my wit's end when it comes to thermodynamics. Apparently, I was given this little assignment from my lecturer to solve it at home. I need help in solving this, really x_xA binary... more
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08/22/15

What is the half life..
What is the half life of a compound if 75% of it decomposes in 60 minutes? Assume first order kinetics. Thanks in advance!!! :-)
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08/22/15

How long will it take..
A certain isotope has a half-life of 5.25 days. How long will it take for 30% of the sample to disintegrate?    Solutions are appreciated. Please answer. Arigatou sensei. 
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Kinetics Chemistry

08/22/15

How much Co-60 will remain..
The half life of Co-60 is 5.3 years. How much Co-60 will remain after  1 year in a sample initially containing 10g of Co-60?   Please show your solution so that I'll how to solve it.    
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