1. Chemical Thermodynamics

Chapter test

1、Which of the following systems contains two phases ( )
    A、A mixture of ice and water
    B、A mixed gas of oxygen and nitrogen
    C、The system consisting of the reaction of zinc powder and hydrochloric acid
    D、A glucose aqueous solution

2、What exchanges exist between the system and the surroundings in the open system? ( )
    A、Both material exchange and energy exchange
    B、Only material exchange
    C、Neither material exchange nor energy exchange
    D、Only energy exchange

3、Which of the following options are composed of state functions? ( )
    A、P, T, H
    B、W, G, H
    C、V, Qp, W
    D、Q, ΔG, ΔH

4、If the system goes through a series of changes and finally returns to the initial state, which option is correct about the change of the thermodynamic functions of the system? ( )
    A、Q=0, W=0, ΔU=0, ΔH=0
    B、Q=0, W=0, ΔU=0, ΔG=0
    C、ΔU=0, ΔH=0, ΔG=0, ΔS=0
    D、Q=W, W=0, ΔU=0, ΔH=0

5、If the ∆rHmӨ(T) of the reaction N2 (g)+ 3H2 (g) = 2NH3 (g) is 92.22 kJ·mol-1, what is the ∆fHmӨ(T) of NH3 (g)? ( )
    A、-92.22 kJ·mol-1
    B、-46.11 kJ·mol-1
    C、46.11 kJ·mol-1
    D、92.22 kJ·mol-1

6、For any process, which of the following statements is correct? ( )
    A、The work done by the system is independent of the reaction path.
    B、The heat absorbed by the system is independent of the reaction path
    C、None of the above statements is correct
    D、The change in the internal energy of the system is independent of the reaction path

7、Which of the following statements about the entropy function is wrong? ( )
    A、The third law of thermodynamics can be expressed as the entropy of any substance at 0 K is zero.
    B、As the temperature increases, the entropy of the same substance increases.
    C、The greater the disorder of the system, the greater its entropy.
    D、Entropy change depends only on the original and final states of the system, and is independent of the way to achieve the change.

8、What is the difference between ∆rHm and ∆rUm for the reaction of H2(g) + 1/2O2(g) = H2O (l) at 298 K?( )
    A、-3.7 kJ·mol-1
    B、3.7 kJ·mol-1
    C、1.2 kJ·mol-1
    D、-1.2 kJ·mol-1

9、If ∆rGmӨ = 10 kJ·mol-1for a reaction, it can be deduced that ( )
    A、It must not proceed spontaneously under standard conditions.
    B、∆rHm Ө >0, ∆rSm Ө <0
    C、It must not proceed spontaneously.
    D、It must not proceed spontaneously under non-standard conditions.

10、Which of the following reactions or processes has a reduced entropy? ( )
    A、The reaction C (s) + 1/2 O2 (g) = CO (g)
    B、The NaCl crystals precipitate out of the solution
    C、CuSO4·5H2O crystals dissolve in water
    D、Sublimation of solid I2

11、∆rHmӨ = 178 kJ·mol-1, ∆rSmӨ =161 J·mol-1 for the reaction of CaCO3 (s) = CaO (s) + CO2 (g), then what is the temperature at which CaCO3 begins to decompose? ( )
    A、800 K
    B、500 K
    C、900 K
    D、1106 K

12、The equation of ∆rGmӨ(T) = ∆rHmӨ(298.15) – 498 ∆rSmӨ(298.15) must be used to calculate ∆rGmӨ(T) for which of the processes under the following conditions ( )
    A、498 K, standard states
    B、298 K, standard states
    C、298 K, any state
    D、498 K, any state

13、In a closed container, the three gases A, B, and C is at a chemical equilibrium. Gas A reacts with B to produce C. At the same temperature, if the volume decreases by 2/3, what happens to the equilibrium constant kp ?
    A、It doesn't change.
    B、3 times the orignal
    C、9 times the orignal
    D、1/3 times the orignal

14、In the following reactions, the reactants and products are both gases and they are at equilibrium. If the pressure is increased, which reaction will not be affected? ( )
    A、N2 + O2 = 2NO
    B、N2 + 3H2 = 2NH3
    C、2NO2 = N2O4
    D、O2 + 2H2 = 2H2O

15、Given that ∆rHmӨ for the reaction of 3O2 (g) = 2O3 (g) is 288.7 kJ·mol-1, which of the following steps is required to move the reaction to the right? ( )
    A、High temperature and high pressure
    B、High temperature and low pressure
    C、Low temperature and low pressure
    D、Low temperature and high pressure

16、When using Hess's law to calculate the heat of the reaction, the heat of reaction is process-independent. This shows that in any case, the heat of chemical reactions is only related to the initial and final states of the reaction, and has nothing to do with the path of the reaction.

17、The heat of a chemical reaction at constant pressure is not a state function.

18、The value of ∆fHmӨ, ∆fGmӨ and SmӨ of a stable element is equal to zero at a given temperature.

19、Reactions with a ∆rSmӨ less than 0 may also proceed spontaneously.

20、As the temperature increases, the standard equilibrium constant KӨ for chemical reactions increases.

2. Fundamentals of Chemical Kinetics

Chapter test

1、The reaction rate of 2SO2(g)+O2 (g)→2SO3(g) can be expressed as v=-dc(O2)/dt, or as ( )
    A、-dc(SO2)/2dt
    B、2dc(SO3)/dt
    C、-2dc(SO2)/dt
    D、-dc/(SO2)/dt

2、The rate constant k is a ( )
    A、Parameter with an uncertain dimension.
    B、The dimension is mol2·dm-1·s-1.
    C、The dimension is mol·dm-3·s-1.
    D、Dimensionless parameters

3、2A+B→C is an elementary reaction. There are 4 moles of A and 2 moles of B in a 1L container at beginning time. When both A and B reach half its initial value, the ratio of the reaction rate at this moment to that at initial time is ( )
    A、1/8
    B、1/4
    C、4
    D、8

4、The rate law of the reaction A(g)+B(g)→C(g) is v=kc(A)2c(B). For the same amount of A and B to start the reaction in a closed batch reactor, if the reactor volume is doubled, how does the initial reaction rate change?
    A、large =1/8small
    B、large =1/6small
    C、large =8small
    D、large =1/4small

5、If the half-life t1/2 of a first-order reaction is 30min, its rate constant k is ( )
    A、20.8min-1
    B、0.023min-1
    C、0.23min
    D、Not sure

6、For the reaction N2(g)+3H2(g)=2NH3(g), ΔrHmθ=-92.2kJ·mol-1 at 25℃. If the reaction temperature is increased, then ( )
    A、The reaction rate for the forward direction is increased, and that for the reverse direction is also increased.
    B、The reaction rate is decreased, the rate for the reverse reaction is increased.
    C、The reaction rate is decreased, the rate for the reverse reaction is also decreased.
    D、The reaction rate for the forward direction is increased, and that for the reverse direction is decreased.

7、Which of the following statements about the reaction rate constant k is correct ( )
    A、If the activation energy Ea of a reaction is high, then k of this reaction must be large
    B、k does not change with temperature
    C、When the temperature keeps constant, k does not change as the concentration change
    D、k does not change with the addition of catalyst

8、For an endothermic reaction, raising temperature will cause the reaction rate constant k and the equilibrium constant Kθ ( ).
    A、k increases, Kθ decreases
    B、k decreases, Kθ increases
    C、k, Kθ are decrease
    D、k, Kθ increases

9、For a chemical reaction, what will change as the reaction proceeds ( )
    A、The reaction rate decreases
    B、The rate constant becomes small
    C、The equilibrium constant becomes small
    D、The activation energy decreases

10、For a zero-order reaction, which of the following statement is correct (
    A、The reaction rate depends on the initial concentration of the reactants
    B、The unit of the rate constant is as the same as the unit of reaction rate
    C、The reaction rate is zero
    D、The reaction rate constant is zero

11、The heat of a reaction is -88.3 KJ·mol-1. If the activation energy for the forward reaction is 113KJ·mol-1, then the activation energy of the reverse reaction (kJ·mol-1) is ( )
    A、201.3
    B、-113
    C、-201.3
    D、113

12、When temperature increases from T1 to T2, for which reaction ( ) the reaction rates will increase more significantly.
    A、The reaction with larger Ea
    B、endothermic reaction
    C、exothermic reaction
    D、The reaction with smaller Ea

13、For a chemical reaction, if the unit of the rate constant k is mol dm-3·S-1, then the reaction order is ( )
    A、3/2
    B、1
    C、1/2
    D、0

14、Which of the following statement is correct ( )
    A、If the exponent of the concentration of reactant in the reaction rate law is equal to its coefficient in the balanced chemical equation, then the reaction is an elementary reaction.
    B、A multistep reaction is composed of several elementary reactions
    C、The reaction order is equal to the sum of the coefficients of all reactants in the balanced chemical equation.
    D、The reaction rate is proportional to the product of the concentration of the reactants

15、Regardless of the reaction order, the half-life of a reaction is ( )
    A、related to k and C0
    B、related to C0
    C、related to k
    D、independent of k and C0

16、The reaction rate constant is the reaction rate.

17、The reaction rate constant is the reaction rate, when the concentration of each reactant is 1 mole per cubic decimeter.

18、For a multistep reaction, the reaction rate is determined by the slowest reaction step.

19、For reversible reactions, when the temperature is increased, the rate constant k of the forward reaction will increase, and the k of the reverse reaction will decrease.

20、For a chemical reaction, if the activation energy of the reaction is reduced by using a catalyst, then the reaction rate is also reduced.