Thermodynamics Calculations
Kinetics Calculations
Thermodynamics Concepts
Kinetics Concepts
Solids
100
Determine for Zn(s) +2HCl(aq)
given the following information.
-39.6 J/K
100
This graph shows the disappearance of a reactant. What is the average rate of this reaction between
5 and 20 seconds?
0.0067 M/s
100
According to the second law of thermodynamics, the change in the entropy of the universe (ΔSuniv) during a spontaneous reaction is
>0
100
The reaction is first order in B and A. The overall order of the reaction is
2nd
100
Different structural forms of the elements are called
allotropes
200
What is the entropy change to the surroundings when one mole of ice melts in someone’s hand if the hand temperature is 32°C? Assume a final temperature for the water of 0°C. The heat of fusion of ice is 6.01 kJ/mol.
-19.7 J/K
200
If the rate of formation of ammonia is 0.345 M/s, what is the rate of disappearance of N2?
0.173 M/s
200
In a spontaneous process, which of the following always increases?
The Entropy of the universe
200
For the reaction 2A + 3B 4C + 5D, the rate of the reaction in terms of ΔA would be written as
200
Arrange the following metals in order of expected increasing density. All have a face-centered cubic unit cell.
Ni, Pd, Pt
Ni < Pd < Pt
300
The enthalpy of fusion for carbon tetrachloride (CCl4) is 2.67 kJ/mol, and its melting point is 250 K. What is the entropy change when 2.0 mol of carbon tetrachloride melts at 250 K?
21.4 J/K
300
For the rate law Rate =k[A][B]1/2, the partial order with respect to A is ________, the partial order with respect to B is ________, and the total order is ________.
300
At 0 K, the entropy of a perfect crystal is
=0
300
One reaction that occurs in an automobile catalytic converter is the conversion of carbon monoxide to carbon dioxide. How is the rate of this reaction related to the rate at which the concentration of a reactant or product changes?
2CO(g) + O2(g) 2CO2(g)
Rate =
300
When Ge is doped with Ga, it produces a(n) ________-type semiconductor.
p-type
400
Determine the entropy change for the reaction given the following information.
-93.9 J/K
400
A second-order reaction (2A B) with a rate constant of 0.350 M-1s-1 is found to have a half-life of 3.45 s. What was the initial concentration of the reactant, [A]0?
0.828 M
400
At constant T and P, any reaction will be spontaneous if
ΔGsys< 0
400
Collision theory assumes the rate of a reaction depends on...
the energy of collisions and the orientation of colliding molecules.
400
Gold has a face-centered cubic structure with a unit cell edge length of 407.8 pm. What is the contribution to the density from each individual gold atom?
19.28 g/cm3
500
If for a reaction is -2.03 kJ/mol, what is K for the reaction at 300 K?
2.26
500
N2O5 is used as a source of NO2 in chemical reactions. The compound decomposes in a first-order reaction. If the initial concentration of N2O5= 0.400 M and the concentration is 0.0250 M after 120. seconds, what is the rate constant k of the reaction?
2.31 × 10-2 s-1
500
Boltzmann derived the relationship S=k ln W, where W is the
The # of microstates
500
The linear form of ________ is very useful, as it allows us to calculate the activation energy and the frequency factor.
the Arrhenius equation
500
The hybridization of atomic orbitals in graphite is
sp2