Consider the molecule:
Specify the hybridization of each carbon atom.
C-1C-2C-3C-4C-5
A)sp2sp2sp2sp3sp
B)sp2sp2sp2sp3sp3
C)sp2sp2sp3sp3sp2
D)sp2sp2sp3sp3sp3
E)sp2sp sp sp2sp
How many of the following apply to fibrous proteins?
A) 1
B) 2
C) 3
D) 4
E) 5
In which direction do electrons flow in the external circuit?
A) left to right
B) right to left
C) no current flows; the cell is at equilibrium
D) cannot be determined.
E) none of these
What is the pH for a buffer that consists of 0.25 M CH3COOH and 0.10 M
CH3COONa? Kaof CH3COOH = 1.8 x 10-5
A)
The reaction 2H2O2–> 2H2O + O2has the following mechanism:
The catalyst in the reaction is:
A)H2O
B)I–
C)H2O2
D)IO–
E)There is no catalyst in this reaction.
The following data were obtained for the reaction, C + D + E –> products. Determine
the rate law.
A)rate = k[C][D][E]
B)rate = k[C]2[D]
C)rate = k[C][D]
D)rate = k[C][E]
E)rate = k[E][D]
In general, the value of the equilibrium constant for a chemical reaction does NOT
depend on
A) The temperature of the reaction vessel.
B) The initial amounts of reactants present.
C) The total pressure of the reaction vessel.
D) The volume of the reaction vessel.
E) The rate constants of the forward and reverse reactions.
Magnesium has an atomic mass of 24.3. There are two isotopes of magnesium € one
contains 12 neutrons and the other contains 13 neutrons in the nucleus. What is the
fractional abundance of the one that contains 12 neutrons?
A)0.3
B)0.5
C)0.67
D)0.7
E)0.75
How should the number 1.230 x 103be properly expressed as a decimal?
A)1230 C)1230.0
B)0.001230 D)1230.
What is the potential at 25°C for the following cell?
Cr | Cr3+(0.015 M) || Ag+(0.00025 M) | Ag
A) 2.09 V
B) 1.35 V
C) 0.95 V
D) 1.71 V
E) 1.49 V
The following question refers to the following system:
3Ag(s) + NO3
–(aq) + 4H+(aq) –> 3Ag+(aq) + NO(g) + 2H2O(l)
Determine the standard cell potential.
A) -1.7634 V
B) 0.1654 V
C) 2.0942 V
D) 3.5268 V
E) 0.5878 V
Select the correct molecular structure for the given species from the choices below:
ClO2
A)pyramidal
B)tetrahedral
C)square planar
D)octahedral
E)none of these
Tetracyanoethylene has the skeleton shown below:
From its Lewis structure determine the following:
How many nonbonded electron pairs are in the molecule?
A)0
B)2
C)4
D)5
E)8
Which of the following is an ester?
A) R-O-R
B) R-COOH
C) R-CO-R
D) R-CONHR
E) RCOOR
Which of the following monomers are used to produce the polymer:
A) I
B) II
C) III
D) I and III
E) II and III
Select the answer that best describes an aqueous solution made from each of the
following substances:
solid sodium carbonate (Na2CO3)
A) acidic
B) basic
C) neutral
D) cannot tell
E) none of these (A-D)
When 87.7 is added to 73.841, the result should be reported with _____ significant
figures. And when 87.7 is divided by 73.841 the result should be reported with ______
significant figures.
A)3,3 C)4,3
B)3,5 D)4,4
Which of the following mixtures would be classified as a buffer solution?
A) 50 mL of 0.100 M HCl and 50 mL of 0.100 M KCl
B) 50 mL of 0.100 M CH3COOH and 55 mL of 0.100 M NaOH
C) 50 mL of 0.100 M CH3COOH and 25 mL of 0.100 M NaOH
D) 50 mL of 0.100 M CH3COOH and 0.500 mL of 0.000100 M NaOH
E) 50 mL of 0.100 M CH3COOH and 55 mL of 0.100 M HCl