ASU Spring 2020 - CHM 116 - Lab Final Exam With
Complete Solutions
What is the name of the app needed to use the temperature probe in this investigation? (Lab
2: Kinetics) - ANSWER Vernier Graphical Analysis
10 drops of 0.200M [I-] solution are used to make a solution with 48 drops, what is the final
molarity of the [I-] solution. - ANSWER M1V1=M2V2
M1 = 0.200 M
V1 = 10 drops
V2 = 48 drops
Solve for M2 => [I-] = 0.042 M
Recording time (Δt) (data collection) for each trial should............ - ANSWER Begin when the
contents of the beaker are mixed with the test tube contents and recording time should stop
when the solution mixture turns dark blue.
The rate law for a reaction is: Rate = k[A][B]^2. Which of the following will cause the value of
the rate constant, k, to change? - ANSWER Changing the reaction temperature
The reaction of acetone with bromine is: C3H6O + Br2→ C3H5OBr + HBr. The following data
for initial rates were obtained. Determine the rate law. - ANSWER Rate = k [Br2]
, The rate law for a reaction is: Rate = k[A][B]2. What are the units on the value of k for this
reaction? - ANSWER M-2 s-1
The rate constant for the reaction HNO3 + NH3 => NH4NO3 is 14.5 M-1s-1. If the
concentration of nitric acid is 0.050 M and the concentration of ammonia is 0.10 M and both
reactants are first order, what will the rate of this reaction be? - ANSWER Rate =
k[HNO3][NH3] = 14.5*[0.050]*[0.10] = 0.073 M/s
The activation energy can be calculated from slope= -Ea/R. Calculate the activation energy in
kJ/mol using the equation of the line in the graph below. - ANSWER 6.65 x 10-7 kJ/mol
What is the overall rate order of the following rate law, Rate = k[HgCl2][C2O42-]^2. -
ANSWER 3, third order reaction
The graph below shows the activation energy required for a reaction under two different
conditions. Which reaction is carried out in the presence of a catalyst? Explain. - ANSWER
Reaction B because it requires less activation energy to begin.
Given the Arrhenius equation, ln k = -Ea /RT + ln A, which of the following corresponds to
faster reaction rates? - ANSWER Reactions with lower activation energies and run at higher
temperatures
When you have completed all trials for this investigation , the chemical waste should be .........
- ANSWER Poured in to the appropriate waste container in the fume hood
Complete Solutions
What is the name of the app needed to use the temperature probe in this investigation? (Lab
2: Kinetics) - ANSWER Vernier Graphical Analysis
10 drops of 0.200M [I-] solution are used to make a solution with 48 drops, what is the final
molarity of the [I-] solution. - ANSWER M1V1=M2V2
M1 = 0.200 M
V1 = 10 drops
V2 = 48 drops
Solve for M2 => [I-] = 0.042 M
Recording time (Δt) (data collection) for each trial should............ - ANSWER Begin when the
contents of the beaker are mixed with the test tube contents and recording time should stop
when the solution mixture turns dark blue.
The rate law for a reaction is: Rate = k[A][B]^2. Which of the following will cause the value of
the rate constant, k, to change? - ANSWER Changing the reaction temperature
The reaction of acetone with bromine is: C3H6O + Br2→ C3H5OBr + HBr. The following data
for initial rates were obtained. Determine the rate law. - ANSWER Rate = k [Br2]
, The rate law for a reaction is: Rate = k[A][B]2. What are the units on the value of k for this
reaction? - ANSWER M-2 s-1
The rate constant for the reaction HNO3 + NH3 => NH4NO3 is 14.5 M-1s-1. If the
concentration of nitric acid is 0.050 M and the concentration of ammonia is 0.10 M and both
reactants are first order, what will the rate of this reaction be? - ANSWER Rate =
k[HNO3][NH3] = 14.5*[0.050]*[0.10] = 0.073 M/s
The activation energy can be calculated from slope= -Ea/R. Calculate the activation energy in
kJ/mol using the equation of the line in the graph below. - ANSWER 6.65 x 10-7 kJ/mol
What is the overall rate order of the following rate law, Rate = k[HgCl2][C2O42-]^2. -
ANSWER 3, third order reaction
The graph below shows the activation energy required for a reaction under two different
conditions. Which reaction is carried out in the presence of a catalyst? Explain. - ANSWER
Reaction B because it requires less activation energy to begin.
Given the Arrhenius equation, ln k = -Ea /RT + ln A, which of the following corresponds to
faster reaction rates? - ANSWER Reactions with lower activation energies and run at higher
temperatures
When you have completed all trials for this investigation , the chemical waste should be .........
- ANSWER Poured in to the appropriate waste container in the fume hood
