The rate of reaction indicates the speed at which the reaction can occur. It can

Question

The rate of reaction indicates the speed at which the reaction can occur. It can be expressed in terms of a change in the concentration of reactants or products per unit of time:
rate = concentration change / time change
The rate of reaction can be expressed either as adecrease in the concentration of a reactant per unit of time or as an increase in the concentration of a productper unit of time.
Select the image to explore the activity that shows the different ways in which the rate of a reaction can be expressed.

PART A:

The rate of the reaction in terms of the "disappearance of reactant" includes the change in the concentration of the reactant, the time interval, and the coefficient of the reactant.
Consider the following reaction:
2A+3B%u21923C+2D
The concentrations of reactant A at three different time intervals are given. Use the following data to determine the average rate of reaction in terms of the disappearance of reactant A between time = 0 s and time = 20 s.
Time (s)    0    20    40
[A](M)    0.0400    0.0240    0.0180
Express your answer in molar concentration per second to three significant figures.
The rate of reaction = _______ M%u22C5s%u22121  

PART B:

The rate of the reaction in terms of the "appearance of product" includes the change in the concentration of the product, the time interval, and the coefficient of the product.
Consider the following reaction:
2A+3B%u21923C+2D
The concentrations of product C at three different time intervals are given. Use the following data to determine the rate of reaction in terms of the appearance of product C between time = 0 s and time = 20 s .
Time (s)    0    20    40
[C](M)    0.000    0.0240    0.0480
Express your answer in molar concentration per second to three significant figures.
The rate of reaction =_________ M%u22C5s%u22121

PART C:

The rate of reaction in terms of the "rate law expression" includes the rate constant (k), the concentration of the reactants, and the orders of the reaction with respect to the different reactants.
Consider the following reaction:
A+B%u2192C+D
The initial concentrations of the reactants A and B are 0.400 M and 0.260 M, respectively.
The rate of reaction is 0.060 M%u22C5s%u22121, and the orders of the reaction, with respect to reactants A and B, are 1 and 2, respectively.
Determine the rate constant (k) for the reaction using the rate law.
Express your answer in M%u22122%u22C5s%u22121 to three significant figures.
The rate constant(k) =_______ M%u22122%u22C5s%u22121



***NOTE: THE ANSWER TO PART A IS NOT 4.4 X 10^-4. I'VE TRIED THAT A COUPLE OF TIMES. THIS QUESTION HASALREADY BEEN ASKED ON CHEGG AND ON YAHOO AND BOTH TIMES THEY'VE SAID THAT'S THE ANSWER, AND IT'S WRONG. SO PLEASE DO NOT COPY AND PAST BECAUSE I'LL KNOW AND IT'LL WASTE MY TIME, AND I WON'T GIVE POINTS. I REALLY NEED HELP WITH THIS. THANK YOU!!***

Explanation / Answer

THE ANSWER I GOT WAS 4*10^-4

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