Exam 2 True/False Practice Flashcards
The temperature dependence of the reaction rate is contained in the rate constant, k
true
An increase in temperature generally decreases k, which increases rate of reaction
false
The frequency factor, A, can be thought of as the number of times that the reactants approach the activation barrier per unit time
true
The exponential factor in the Arrhenius equation represents the fraction of molecules that have enough energy to make it over the activation barrier on a given approach.
true
The transition state is found at the bottom after an activation energy “hill”
false
As temperature decreases, the exponential factor of the Arrhenius equation increases
false
Catalytic hydrogenation of an alkene by platinum is an example of heterogeneous catalysis.
true
Sucrase is an enzyme that catalyzes the breaking up of table sugar into glucose and fructose by weakening the connecting bond
true
catalyst provides a pathway that reduces the activation energy compared to the rate-limiting step for a reaction
true
The catalytic destruction of ozone by Cl is an example of homogenous catalysis.
true
When K > 1, the forward reaction is favored and there will be a relatively high concentration of products
true
At a given temperature, all combinations of starting concentrations will produce the same set of equilibrium concentrations because the value of K is constant for a given temperature
false
reaction is reversible if it can proceed in both the forward and reverse directions
true
When a reaction reaches equilibrium, the concentration of products and reactants are equal
false
When a reaction reaches equilibrium, the forward and reverse reactions stop
false
Kp = Kc
for CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)
true
Kp = Kc
for PCl5(g) –> PCl3(l) + Cl2(g)
true
Kp = PI2 / PI2
for I2(g) 2 I(g)
true
Kc = [I]2 / [I2]
for I2(g) -> 2 I(g)
true
If Kc = 6.26 x 10–22 at 25˚C
for I2(g) -> 2 I(g),
then Kp = 1.53 x 10–20 at 25 ˚C.
true
HBrO4 is perbromic acid
true
HBr is hydrobromic acid
true
HIO is hypoiodic acid
false
Adding together HClO4 and NaOH produces water and a salt.
true
If it requires 60.0 mL of 0.040 M sodium hydroxide solution to completely neutralize 40.0 mL of an unknown triprotic acid, the concentration of the acid is 0.020 M.
true
If you accidentally spill a strong acid on your face, you should splash your face with a strong base to neutralize the acid
false
According to the Arrhenius definition, a base produces hydroxide in aqueous solution; according to the Brønsted-Lowry definition, an acid is a proton acceptor
false
The conjugate base of water is hydroxide
true
The conjugate acid of HSO4– is H2SO4
true
HNO2(aq) + H2O(l) -> NO2–(aq) + H3O+(aq), nitrous acid and H2O are a conjugate acid-base pair
false
Acidity increases as electronegativity increases to the right across a row for binary acids.
true
Acidity decreases as bond strength decreases down a column for binary acids.
false
Hydroiodic acid is stronger than hydrobromic acid.
true
Periodic acid is weaker than perbromic acid
true
Bromic acid is weaker than bromous acid
false
Nitrite is a stronger base than nitrate
true
