A sample of nitrous oxide, N2O, occupies 16,500 mL at STP. What is the mass of the
sample?
A)18.9
B)22.1
C)22.8
D)32.4
E)46.0
Tetracyanoethylene has the skeleton shown below:
From its Lewis structure determine the following:
How many of the atoms are sp hybridized?
A)2
B)4
C)6
D)8
E)10
Which has these types of electromagnetic radiation arranged in order of increasing
wavelength?
A)visible, ultraviolet, x-ray
B)radiowaves, visible, ultraviolet
C)ultraviolet, visible, infrared
D)x-ray, visible, ultraviolet
E)none of these
The following questions refer to the reaction 2A2 + B2 –> 2C The following
mechanism has been proposed:
What is the molecularity of step 2?
A)unimolecular
B)bimolecular
C)termolecular
D)quadmolecular
E)molecularity cannot be determined
What are the units for the rate constant for this reaction?
A)L/mol·s
B)L2/mol2·s
C)mol/L·s
D)L3/mol3·s
E)mol3/L
The following data were obtained at 250C:
What is the correct rate law?
A)Rate = k[A][B][C]
B)Rate = k[A][B][C]2
C)Rate = k[A][C]
D)Rate = k[A]3[B]2[C]
E)Rate = k[A][C]2
In which of the following reactions do you expect to have the largest increase in
entropy?
A) I2(s) –> I2(g)
B) 2IF(g) –> I2(g) + F2(g)
C) Mn(s) + O2(g) –> MnO2(s)
D) Hg(l) + S(s) –> HgS(s)
E) CuSO4(s) + 5H2O(l) –> CuSO4
.H2O(s)
The first three levels of the hydrogen atom are shown below with their energies in J.
Which answer contains all the possible photons that could be generated by transitions
among the three levels and no others?
nE (J)
3 ________-2.42 x 10-19
2 ________-5.45 x 10-19
1 ________-2.18 x 10-18
A)one photon, E = 1.94 x 10-18J
B)two photons, E = 1.94 x 10-18J and 1.64 x 10-18J
C)two photons, E = 3.03 x 10-19J and 1.64 x 10-18J
D)photons, E = 3.03 x 10-19J, 1.94 x 10-18J and 1.64 x 10-18J
The reaction
is second order in A. When [A]0= 0.100 M, the reaction is 20.0% complete in 43.2
minutes. Calculate the half-life for the reaction.
Consider the following molecules.
I.BF3
II.CHBr3(C is the central atom)
III.Br2
IV.XeCl2
V.CO
VI.SF4
Select the molecule(s) that fit the given statement.
These molecules violate the octet rule.
A)I, II, IV
B)I, III, IV, VI
C)III, V, VI
D)I, IV, VI
E)I, II, IV, VI
The total volume of hydrogen gas needed to fill the Hindenburg was 2.11´108L at 1.00
atm and 24.7°C. How much energy was evolved when it burned?
The numerical value of the rate constant is
What volume is occupied by 21.0 g of methane (CH4) at 27°C and 1.25 atm?
A reaction represented by the equation was studied at a specific temperature and the
following data were collected:
3O2(g) –> 2O3(g)
What is the rate law for this reaction?
Calculate the root mean square velocity for the O2molecules in a sample of O2gas at
11.8°C. (R = 8.3145 J/K mol)
Write molecular equations for the following reactions:halogenation of ethane
Gaseous reacts with according to the following equation:
What volume of oxygen gas at STP is needed to react with 5.75 mol of ?