Question :
31.When a sample of aqueous hydrochloric acid was neutralized with : 1318411
31.When a sample of aqueous hydrochloric acid was neutralized with aqueous sodium hydroxide in a calorimeter, the temperature of 100.0 g of water surrounding the reaction increased from 25.0°C to 31.5°C. If the specific heat of water is 1.00 cal/(g?°C), calculate the quantity of energy in calories involved in this neutralization reaction.
A) 1000 cal B) 100.0 cal C) 6.50 cal D) 1250 cal E) 650 cal
32.Ethylene glycol has a specific heat of 0.578 cal/(g?°C). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy, what will the temperature increase be?
A) 0.177°C B) 1.88°C C) 5.64°C D) 1.01 ? 103 °C E) 3.03 ? 103 °C
33.In the potential energy diagram for a chemical reaction, what is the name used for the unstable species corresponding to the top of the energy barrier separating reactants from products?
A)catalystD)free radical
B)activated complexE)substrate
C)intermediate
34.Which one of the following actions can alter the activation energy of a reaction?
A)changing the temperature
B)changing the concentration of reactants
C)changing the concentration of products
D)changing the size of the reaction vessel
E)adding a catalyst
35.One effect of a catalyst being added to a reaction mixture is ___________________.
A)to increase the equilibrium constant for the reaction
B)to slow down the rate of the reverse reaction
C)to raise the temperature of the mixture
D)to provide a new pathway for the reaction
E)None of the choices are correct.
36.In kinetics, the order of a reaction __________________________.
A)is the inverse of the entropy of the system
B)must be measured experimentally
C)can be deduced from the balanced equation for the reaction
D)depends on the rate constant
E)depends on the concentrations of reactants
37.Which of the following statements concerning the reversible reaction below is FALSE?
N2O4(g) 2NO2(g)
A)The forward reaction produces NO2, and the reverse reaction produces N2O4.
B)At the start of the reaction, the forward reaction rate is greater than the reverse reaction rate.
C)As the reaction progresses and the concentration of N2O4 decreases, the rate of the forward reaction decreases.
D)As the reaction progresses and the concentration of NO2 increases, the rate of the reverse reaction increases.
E)When the reaction reaches equilibrium, the concentrations of NO2 and N2O4 are equal.
38.Consider the reversible reaction: A(g) 2B(g)
At equilibrium, the concentration of A is 0.381 M and that of B is 0.154 M. What is the value of the equilibrium constant, Keq?
A) 0.0622 B) 0.404 C) 1.06 D) 2.47 E) 16.1
39.Consider the reversible reaction: N2(g) + 3H2(g) 2NH3(g)
What is the correct expression for the equilibrium constant, Keq, for this reaction?
A)
B)
C)
D)
E)
40.Which one of the following, if changed, would change the value of the equilibrium constant, Keq, of a reaction?
A)concentration of reactantsD)catalyst
B)concentration of the productsE)size of reaction vessel
C)temperature
