Select the correct molecular structure for the given species from the choices below:
SiH4
A)pyramidal
B)tetrahedral
C)square planar
D)octahedral
E)none of these
Referring to the structures below, which statement is true?
A) I and II have different molecular formulas.
B) I and III are structural isomers of each other.
C) II and III are stereoisomers of each other.
D) II and III are different conformations of the same compound.
E) I and III are the same compound.
Which one of each of the following pairs would be more soluble in water?
I. CH3OH or CH4
II. NaCl or AgCl;
III. CH3CH2OH or CH3CH2CH2CH2CH2CH2CH2CH2CH2OH
A)CH3OH, NaCl, CH3CH2CH2CH2CH2CH2CH2CH2CH2OH
B)CH3OH, NaCl, CH3CH2OH
C)CH4, NaCl, CH3CH2OH
D)CH4, AgCl, CH3CH2CH2CH2CH2CH2CH2CH2CH2OH
E)CH3OH, AgCl, CH3CH2OH
For each of the following solutions, describe the deviation with respect to Raoult’s Law.
hexane (C6H14) and chloroform (CHCl3)
A)relatively ideal
B)positive deviation
C)negative deviation
D)more information needed
E)none of these
Which of the following statements is FALSE:
A) At equilibrium, the concentrations of all species are constant
B) The value of the equilibrium constant depends on the temperature
C) At equilibrium, the reaction has stopped
D) At equilibrium, the forward and reverse reactions are happening at the same rate
E) Pure solids are not included in the equilibrium constant expression.
Bromine will form compounds with each of the other elements in Period 4 of the
periodic table. How does the type of bonding in the compounds change as one moves
from potassium bromide to selenium bromide?
A) polar covalent to ionic
B) ionic to polar covalent
C) polar covalent to non-polar covalent
D) coordinate covalent to polar covalent
E) all are polar covalent
Which of the following atoms, isotopes or ions contains 23 protons, 18 electrons and 27
neutrons?
A)45Co5+
B)50Kr
C)50V5+
D)41Kr5-
E)50V5-
Tabulated below are initial rate data for the reaction
Run Initial
The experimental rate law is:
A)
B)
C)
D)
E)
Which of the following elements does NOT have a symbol taken from a LATIN name
for the element or one of its compounds?
A)iron
B)copper
C)sodium
D)potassium
E)titanium
Using the following data reactions:
DH° (kJ)
H2(g) + F2(g) –> 2HF(g)−542
H2(g) –> 2H(g)432
F2(g) –> 2F(g)154
calculate the energy of an H-F bond.
A)1128 kJ
B)22 kJ
C)44 kJ
D)271 kJ
E)564 kJ
A solution is made by dissolving 100. g of cobalt(III)chloride in 250. g of water. to
make a solution that has a density of 1.25 g/mL. Calculate (I) the molality and (II) the
molarity of the solution.
A)(I) 2.42 m(II) 2.16 M
B)(I) 2.16 m(II) 2.42 M
C)(I) 0.400 m(II) 0.500 M
D)(I) 0.0417 m(II) 0.0522 M
E)(I) 0.0522 m(II) 0.0417 M
How many of the following molecules exist?
A) 0
B) 1
C) 2
D) 3
E) 4
Convert 0.0494 to L. (2.54 cm = 1 in., 1 L = 1 )
What is the energy of a photon of blue light that has a wavelength of 453nm?
Larger second ionization energy, Na or Mg
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 value of the rate constant?
For the reaction aA –> Products, use the following choices
a) zero order in A
b) first order in A
c) second order in A
d) a, b, c
e) none of the above
A plot of [A] vs. t is a straight line.
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.
ICl4
–
The following initial rate data were found for the reaction
What is the value of the rate constant?
Selecting from the following reagents, indicate which reagents would be mixed to give
the compounds described.
CuSO4(aq) Fe2(CO3)3(s) NH3(aq)
CuCO3(s) FeCl3(aq) Na2SO4(aq)
Cr(OH)3(s) H2SO4(aq)
Cu(OH)2(s)