Half-Life and Arrhenius
If the half life of a reaction is independent of concentration, the reaction can be:
A) first order and second order only
B) second order and zeroth order only
C) first order only
D) second order only
C) first order only
Assign the following rate laws to their reaction order:
rate = k[X]1
rate = k
rate = k[X]2
rate = k[X]1 = first order
rate = k: zeroth order
rate = k[X]2 = second order
This artist's Eras tour finally reached its conclusion on December 8th, 2024.
Which statement regarding chemical reactions is true according to collision theory?
A) All molecular collisions result in chemical reactions
B) Catalysts make individual collisions more effective, increasing reaction rates
C) Proper orientation of molecules is required for collision to result in chemical reactions
D) Increasing the temperature of a reaction decreases the kinetic energy of molecules, making collisions more effective
C) Proper orientation of molecules is required for collision to result in chemical reactions
The value of a rate constant of a reaction can generally be expected to
A) decrease with increasing temperature
B) increase with increasing temperature
C) decrease with increasing temperature only when the reaction is exothermic
D) increase with increasing temperature only when the reaction is exothermic
B) increase with increasing temperature
Two reactions with different activation energies have the same rate at room temperature. Which statement correctly describes the rates of these two reactions at the same, higher temperatures?
A) The reaction with the larger activation energy will be faster
B) The reaction with the smaller activation energy will be faster
C) The two reactions will continue to occur at the same rates
D) A prediction cannot be made without additinoal infromation
A) The reaction with the larger activation energy will be faster
The rate law for the reaction:
A + B -> C + D
is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the reaction will:
A) remain the same
B) be increased by a factor of 2
C) be increased by a factor of 4
D) be increased by a factor of 8
B) be increased by a factor of 2
Lady Gaga's 2025 album, containing the songs "Garden of Eden" and "Vanish Into You", is titled:
Mayhem
Which statement best explains why the activation energy is changed by adding a catalyst?
A) The catalyst changes the reaction mechanism
B) The catalyst changes the free energy of the reaction
C) The catalyst increases the kinetic energy of the reactants
D) The catalyst lowers the reaction volume, increasing the concentration of reactants
A) The catalyst changes the reaction mechanism
The gas phase reaction, A2 + B2 -> 2AB proceeds by bimolecular collisions between A2 and B2 molecules. The rate law is k[A2][B2]
If the concentrations of both A2 and B2 are doubled, the reaction rate will change by a factor of:
A) 1/2
B) square root of 2
C) 2
D) 4
D) 4
After 55 years, what mass (in g) remains of a 200.0 g sample of a radioactive isotope with a half-life of 10.0 years?
A) 0.22 grams
B) 4.4 grams
C) 51 grams
D) 170 grams
B) 4.4 grams
The reaction NO2(g) -> NO(g) + 1/2O2(g) has a linear plot when the y axis is 1/[NO2]. What is the rate law for the reaction?
A) rate = k
B) rate = k x 1/[NO2]
C) rate = k[NO2]
D) rate = k[NO2]2
D) rate = k[NO2]2
What athlete danced with Kendrick Lamar at the Superbowl Halftime show this year?
Serena Williams
What will increase the value of the rate constant for an elementary step?
A) Adding a catalyst
B) raising the temperature
C) increasing the concentration of products
D) increasing the concentration of reactants
B) raising the temperature
Consider this equilibrium:
2SO2(g) + O2(g) <-> 2SO3(g)
The forward reaction is preceding at a certain rate for some temperature and pressure. When the pressure is increased, what might we expect for the forward reaction?
A) a greater rate of reaction and a greater yield of SO3 at equilibrium
B) a greater rate of reaction and a same yield of SO3 at equilibrium
C) a lesser rate of reaction and a smaller yield of SO3 at equilibrium
D) a lesser rate of reaction and a greater yield of SO3 at equilibrium
A) a greater rate of reaction and a greater yield of SO3 at equilibrium
The half-life for the first-order radioactive decay of 32P is 14.2 days. How many days would be required for a sample of a radiopharmaceutical containing 32P to decrease to 20.0% of its original activity?
A) 33.0 d
B) 49.2 d
C) 71.0 d
D) 286 d
A) 33.0 d
What is the rate law of this reaction?
(I'll put up the chart for this on the board!)
2H2(g) + 2NO(g) -> N2(g) + 2H2O(g)
A) rate = k[H2]2[NO]
B) rate = k[H2][NO]2
C) rate = k[H2]2[NO]2
D) rate = k[N2][H2O]2/[H2]2[NO]2
B) rate = k[H2][NO]2
Doecchi
The decomposition of hydrogen peroxide in the presence of iodide ion is believed to occur via this mechanism.
H2O2(aq) + I-(aq) -> H2O(l) + IO-(aq)
H2O2(aq) + IO- -> H2O(l) + O2(g) + I-(aq)
In this mechanism, I-(aq) is:
A) a catalyst
B) a reactant in the overall reaction
C) the activated complex
D) a product in the overall reaction
A) a catalyst
What's my actual last name?
Gundrum
The activation energy for a particular reaction is 83.1 kJ * mol-1. By what factor will the rate constant increase when the temperature is increased from 50.0 degrees Celsius to 60.0 degrees Celsius?
A) 2.53
B) 1.00
C) 0.927
D) 0.395
A) 2.53
The decomposition of NOCl is second order.
2NOCl(g) -> 2NO(g) + Cl2(g)
The initial concentration of the reactant is 0.050 M. The rate constant equals 0.020 L * mol-1 * s-1. What will the concentration be after 45 minutes?
A) 0.048 M
B) 0.029 M
C) 0.014 M
D) 0.0054 M
C) 0.014 M
Which Apple TV series had a pop-up promotional event in Grand Central Station to kick off its second season?
Severance
Consider the reaction:
2NO2(g) + F2(g) <-> 2NO2F(g)
A proposed mechanism for the reaction is:
NO2 + F2 <-> NO2F + F (slow)
NO2 + F ,_> NO2F (fast)
What is the rate law for this mechanism?
A) none of the following
B) rate = k[NO2]2[F2]
C) rate = k[NO2][F2]
D) rate = k[NO2][F]
C) rate = k[NO2][F2]
Free points for you!
:)