Consider the following data concerning the equation:
The average value for the rate constant k (without units) is
A)2710
B)2.74 x104
C)137
D)108
E)none of these
Using the following electronegativity values:
C2.5Cl3.0
H2.1O3.5
select from the following group the molecule that fits the given statement:
a)CH3CHO
b)CO2
c)CH3Cl
d)C2H6
e)none
This molecule shows the smallest number of lone pairs in its Lewis structure.
A)CH3CHO
B)CO2
C)CH3Cl
D)C2H6
E)All have zero lone pairs.
Borane, B2H6, forms dimers in which 2 hydrogen atoms bridge between the boron
atoms forming 3-center bonds. How many electrons are shared in such a 3-center bond?
A) 1
B) 2
C) 3
D) 4
E) 6
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 have a zero net dipole moment.
A)III, V
B)I, III, IV
C)III, IV, V
D)I, III, IV, VI
E)none of them
Which of the following molecules or ions contains a central atom with
dsp3hybridization?
A)SO4
2-
B)SF4
C)SiF4
D)ClO4
2-
E)all of these contain a central atom with sp3hybridization
When solutions of acetic acid and sodium hydroxide react, which of the following are
NOT present in the net ionic equation?
I.hydrogen ion
II.acetate ion
III.sodium ion
IV.hydroxide ion
A)I and II
B)I, II, and III
C)I and IV
D)I and III
E)II and III
A general reaction written as A + 2B –> C + 2D is studied and yields the following
data:
What is the order of the reaction with respect to B?
A)0
B)1
C)2
D)3
E)4
Which of the following compounds is expected to have the LOWEST boiling point?
A)CH3OCH3
B)CH3CH2OH
C)CH3CH2CH2CH3
D)CH3CH2CH3
E)CH3Cl
Which of the following unit factors is incorrect?
A)1 microliter/1000 nL C)1 L/1000 mL
B)1 cg/100 g D)1000 m/1 km
Which statement is true?
A) All real processes are irreversible.
B) A thermodynamically reversible process takes place infinitely fast.
C) In a reversible process, the state functions of the system are always much greater
than those of the surroundings.
D) There is always more heat given off to the surroundings in a reversible process than
in an unharnessed one.
E) All statements (A-D) are true.
Consider the reaction 3A + B + C –> D + E where the rate law is defined as
.
An experiment is carried out where [B]0= [C]0= 1.00 M and [A]0= 1.00 x10-4M.
After 3.00 minutes, [A] = 3.26 x10-5M. The value of k is
Larger first ionization energy, C or N
The volume of a single cell.
Draw and name the two possible missing products below.
Choose the correct equation for the standard enthalpy of formation of CO(g), where
DHf° for CO = -110.5 kJ/mol (gr indicates graphite).
For each of the following compounds:
a)Draw the Lewis structure.
b)Give the shape of the molecule.
c)Indicate the polarity of the molecule.
NH3
Consider the following portion of the energy-level diagram for hydrogen:
n = 4 −0.1361 x 10−18J
n = 3 −0.2420 x 10−18J
n = 2 −0.5445 x 10−18J
n = 1 −2.178 x 10−18J
In the hydrogen spectrum, what is the wavelength of light associated with the n = 3 to
n=1electron transition?
The distance of 21 km equals
Larger atomic radius, N or O