Equilibrium
The expression for Keq for the reaction below is __________.
4CuO (s) + CH4 (g)→CO2 (g) + 4Cu (s) + 2H2O (g)
(CO2) (H2O)^2 / (CH4)
A catalyst is added to a system at equilibrium. The concentration of the reactants will:
have no change
A reaction follows the rate law: Rate = k[A]2. Which of the following plots will give a straight line?
A) 1/[A] versus 1/time
B) [A]2 versus time
C) 1/[A] versus time
D) ln[A] versus time
E) [A] versus time
1/[A] versus time
When Fe2+ is oxidized to Fe3+, the Fe2+ ion, what happens?
loses 1 electron
The conjugate base of HSO4- is:
A) H2SO4 B) SO42- C) H3SO4+ D) HSO4+ E) OH
SO42-
This is the principle that states a system (rxn) in equilibrium will shift direction to balance any changes that are made:
Le Chatelier's Principle
This is directly proportional to the kinetic energy of a substance:
Temperature in Kelvin
Temperature in Celsius
The amount of pressure in the container
The size of the container
Temperature in Kelvin
Rate=k represents reactions that don't depend on the concentration of any species, but proceed at a characteristic rate. These reactions are of what order.
First Order
Second Order
Third Order
Zero Order
Fifth Order
Zero Order
When the equation Co + Ni2+ →Co3+ + Ni is balanced, the sum of the coefficients is:
10
Ammonia is a __________.
Weak Base
As the frequency and the number of effective collisions between reacting particles increases, the rate of the reaction:
A. increases
B. decreases
C. remains the same
D. approaches zero
E. none of the above
Increases
What are the mathematical symbols in the equation q = mCΔT?
q=heat, m=mass, C=specific heat, ΔT=change in temperature
Consider the following reaction: 3A ¬ 2B
The average rate of appearance of B is given by D[B]/Dt. Comparing the rate of appearance of B and the rate of
disappearance of A, we get D[B]/Dt = _____ x (-D[A]/Dt).
A) -2/3 B) -3/2 C) +2/3 D) +3/2 E) +1
C) +2/3
Of the compounds below, in which one does chlorine have the highest oxidation number?
HCl
KClO3
HClO2
KClO4
CaCl2
KClO4
Which solution below has the highest concentration of hydroxide ions?
A) pH = 3.21 B) pH = 9.82 C) pH = 7.93
D) pH = 12.59 E) pH = 7.00
pH= 12.59
Consider the following reaction at equilibrium:
2CO2 (g) → 2CO (g) + O2 (g) Delta H = -514 kJ
Le Chatelier's principle predicts that an increase in temperature will ________.
It will shift the reaction left and decrease the value of the equilibrium constant
A device used to measure the amount of heat absorbed or released during a process which separates one surrounding from all of the surroundings
Calorimeter
What units are appropriate for a first-order reaction rate constant?
s^-1
What is the purpose of the salt bridge in an electrochemical cell?
It allows ion migration.
What is the pH of a 0.20 M solution of HC2H3O2, with a Ka = 1.8 x 10^-5?
2.7
4
6.2
1.6
3.9
2.7
If the equilibrium is established by initially adding 0.10 mol each of A and B to a 1L container, then which of the following must be true once the mixture achieves equilibrium? A + 2B →2C K = 320
a. [A] = [B] b. [A] = [B] = [C] c. [B] = 2[C] d. [A] > [B] e. [A] < [B]
d. [A] > [B]
How much heat is released by 9.0 moles of liquid water that is freezing? (the heat of fusion is 6.01 kJ/mol)
54kJ
As two molecules collide and chemically react, they are thought to form a short-lived, unstable arrangement of atoms called this before breaking apart to form products. What is this?
activated complex
When nonspontaneous redox reactions occur by use of an external current, the process is called:
Neutralization
Esterification
Electrolysis
Hydrolysis
Voltaic ion
Electrolysis
Which one of the following is the weakest acid?
A) HF (Ka = 6.8 ˛ 10-4)
B) Acetic acid (Ka = 1.8 ˛ 10-5)
C) HNO2 (Ka = 4.5 ˛ 10-4)
D) HClO (Ka = 3.0 ˛ 10-8)
E) HCN (Ka = 4.9 ˛ 10-10)
HCN (Ka = 4.9 ˛ 10-10)