Solutions
All solutions are what kind of mixture?
Homogeneous
According to Table I, which equation represents a change resulting in the greatest quantity of energy released?
A) 2C(s) + 3H2(g) -->C2H6(g)
B) 2C(s) + 2H2(g) -->C2H4(g)
C) N2(g) + 3H2(g) -->2 NH3(g)
D) N2(g) + O2(g) -->2 NO(g)
C)N2(g)+3H2(g)-->2NH3(g)
At equilibrium, whaat can be said about the concentrations of reactants and products?
They are constant
In which laboratory process is a volume of solution of known concentration used to determine the concentration of another solution?
A) deposition
B) filtration
C) distillation
D) titration
D) titration
Given the balanced equation:
KNO3(s) + 34.89kJ --> K+(aq) + NO3-(aq)
Which statement best describes this process?
A) It is endothermic and entropy increases.
B) It is endothermic and entropy decreases.
C) It is exothermic and entropy increases.
D) It is exothermic and entropy decreases.
A) It is endothermic and entropy increases.
Why is N2H4 soluble in water?
They are both polar/have like polarities
Explain, in terms of collision theory, why using 1.0 grams of powdered zinc, instead of the 1.0-gram strip of zinc, would increase the rate of the reaction.
The greater surface area in powdered zinc would
have resulted in more frequent collisions between the zinc atoms and the hydrogen ions in the HCl(aq).
Write the correct equilibrium constant expression for the reaction below.
N2(g) + 3H2(g) <-> 2NH3(g)
Keq = [NH3]2
[N2][H2]3
What is the H+ ion concentration of an aqueous solution that has a pH of 11?
1.0 × 10–11 mol/L
Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue if the pH of the solution is
A) 4.7
B) 6.0
C) 7.8
D) 9.9
D) 9.9
What is the molarity of a solution that contains 30. grams of NaOH in 500. milliliters of solution?
1.5 M
How does a catalyst increase the rate of reaction?
lowers activation energy/provides alternative pathway
Given the reaction at equilibrium:
A(g) + B(g) <-> C(g) + D(g)
The addition of a catalyst will
A) shift the equilibrium to the left
B) increase the rate of forward and reverse reactions equally
C) have no effect on the forward or reverse reactions
D) shift the equilibrium to the right
B) increase the rate of forward and reverse reactions equally
What does the word amphoteric mean?
Can act as a Brønsted-Lowry acid or base
Which solution has the highest boiling point at standard pressure?
A) 0.10 M K3PO4(aq)
B) 0.10 M KNO3(aq)
C) 0.10 M K2SO4(aq)
D) 0.10 M KCl(aq)
A) 0.10 M K3PO4(aq)
A single 250.-gram serving of one sports drink contains 0.055 gram of sodium ions. Determine the concentration in terms of percent by mass.
0.022%
A 1.0-gram piece of zinc reacts with 5 milliliters of HCl(aq). Which of these conditions of concentration and temperature would produce the greatest rate of reaction?
A) 1.0 M HCl(aq) at 20.°C
B) 1.0 M HCl(aq) at 40.°C
C) 2.0 M HCl(aq) at 20.°C
D) 2.0 M HCl(aq) at 40.°C
D) 2.0 M HCl(aq) at 40.°C
What is the only factor that can change the value of an equilibrium constant?
Temperature
Which reactants form the salt CaSO4(s) in a neutralization reaction?
A) H2SO4(aq) and Ca(OH)2(aq)B) H2S(g) and Ca(ClO4)2(s)
C) SO2(g) and CaO(s)
D) H2SO3(aq) and Ca(NO3)2(aq)
A) H2SO4(aq) and Ca(OH)2(aq)
What happens to the freezing point as a salt dissolves in pure water?
The freezing point decreases
How many grams of C6H12O6 are needed to be dissolved in water to make 100. grams of a 250. ppm solution?
0.0250 g
2NO2(g) <-> N2O4(g) + 58kJ
State evidence from the equation that the forward reaction is exothermic.
— There are 58 kJ of energy produced by the forward reaction.
— The heat term is on the right side of the equation.
Given the reaction at equilibrium:
N2(g) + O2(g) <-> 2NO(g)
If the temperature remains constant and the pressure increases, the number of moles of NO(g) will
A) Increase
B) Decrease
C) Remain the same
C) Remain the same
When the salt Na2CO3 undergoes hydrolysis, the resulting solution will be
A) acidic with a pH less than 7
B) acidic with a pH greater than 7
C) basic with a pH greater than 7
D) basic with a pH less than 7
C) basic with a pH greater than 7
An aqueous solution with a pH of 4 would have a hydroxide ion concentration of
1 x 10-10 M