Chemistry - Unit 5 – Kinetics
Authored by Jordan L
Science
10th Grade
NGSS covered
Used 17+ times
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16 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
I affirm that I will not give or receive any unauthorized help on this exam, and that all work will be my own.
I agree
I disagree
2.
MULTIPLE CHOICE QUESTION
5 mins • 6 pts
1. When the rate of consumption of iron (II) is 15.0 M/s, what is the rate of production of the manganese (II) ion?
A. 3.0 M/s
B. 15.0 M/s
C. 5 M/s
D. 24.0 M/s
Answer explanation
Rates of change are stoichiometric. Therefore, since iron (II) and manganese (II) are in a 5 mol: 1 mol ratio, manganese (II) is produced at a rate of 3.0 M/s at that instant.
Tags
NGSS.HS-PS1-5
3.
MULTIPLE CHOICE QUESTION
5 mins • 6 pts
2. A reaction is found to have the following mechanism, what is the order of the overall reaction with respect to substance A_2?
A. 0th
B. 1st
C. 2nd
D. 3rd
Answer explanation
The slow step for the mechanism is the first step. This means the rate law for this elementary step is equal to the overall reaction. The slow, elementary step has 1 for the coefficient for A_2; therefore, the reaction is first order with respect to A_2.
Tags
NGSS.HS-PS1-5
4.
MULTIPLE CHOICE QUESTION
5 mins • 6 pts
3. Which of the following correctly justifies why most chemical reactions slow down as they proceed?
A. As a reaction proceeds, there are less products.
B. As a reaction proceeds, there are less reactants.
C. As a reaction proceeds the temperature decreases.
D. As a reaction proceeds it consumes the catalyst.
Answer explanation
The rate of the reaction depends on the concentration of the reactants. Because a chemical reaction consumes the reactants, the rate of the reaction decreases.
5.
MULTIPLE CHOICE QUESTION
5 mins • 6 pts
4. A reaction is represented by the equation 2X + A -> XA + X. A plot of the concentration of A versus time, shown below, was found to have a negative slope. What is the order of the reaction with respect to A?
A. 0th
B. 1st
C. 2nd
D. 3rd
Answer explanation
Since the plot of [A] versus time is linear, this indicates the reaction is 0th order with respect to A.
Tags
NGSS.HS-PS1-5
6.
MULTIPLE CHOICE QUESTION
5 mins • 6 pts
Based on the data, what is the concentration of the substance after 60 s?
A. 0.125 M
B. 0.032 M
C. Need to know the order of the reaction.
D. 0.063 M
Answer explanation
The data shows the half life of the reaction is 10 s. Therefore, by dividing the concentration given by two a sufficient number of times, one finds the concentration at 60 s to be 0.063 M.
Tags
NGSS.HS-PS1-5
7.
MULTIPLE CHOICE QUESTION
5 mins • 6 pts
6. The following data table shows the concentration of a reaction and the initial rate data. Based on the table, what is the order of the reaction with respect to the reactant?
A. 0th
B. 1st
C. 2nd
D. 3rd
Answer explanation
Since the concentration of the reactant does not affect the rate of the reaction, the order of the reaction with respect to the reactant is 0th order.
Tags
NGSS.HS-PS1-5
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