Which 1strow transition metal demonstrates the most oxidation states?
A) Fe
B) Ti
C) Cr
D) V
E) Mn
Select the correct molecular structure for the given species from the choices below:
XeF6
A)pyramidal
B)tetrahedral
C)square planar
D)octahedral
E)none of these
Under certain conditions the reaction H2O2 + 3I– + 2H+ –> I3
– + 2H2O occurs by the
following series of steps:
Which of the steps would be called the rate-determining step?
A)1
B)2
C)3
D)4
E)5
For the complete combustion of 1.000 mole of ethane gas at 298 K and 1 atm pressure,
DH° = -1560 kJ/mol. What will be the heat released when 4.42 g of ethane is
combusted under these conditions?
A)-230 kJ
B)230 kJ
C)10588 kJ
D)-10588 kJ
E)none of these
Which of these statements is a consequence (follows from) the Law of Multiple
Proportions?
A)All samples of chlorine contain 35Cl and 37Cl in the same (definite) ratio.
B)The mass of oxygen that is combined with a fixed mass of nitrogen in each of the
binary nitrogen oxides can be expressed as a ratio of small whole numbers.
C)The atomic masses of all of the elements in the periodic table have fixed values.
D)The % lead by mass in the compound galena is the same for all pure samples
obtained from any source.
E)None of these is correct
Select the spectator ions for the following reaction in aqueous solution, AgNO3+ LiI
–> AgI + LiNO3
A)Li+(aq), NO3
–(aq)
B)Ag+(aq), NO3
–(aq)
C)Li+(aq), I–(aq)
D)Ag+(aq), I –(aq), Li+(aq), NO3
–(aq)
E)Ag+(aq), I –(aq)
A sample of an unknown gas takes 434 s to diffuse through a porous plug at a given
temperature. At the same temperature, N2(g) takes 175 s to diffuse through the same
plug. What is the molar mass of the unknown gas?
A)172 g/mol
B)69.1 g/mol
C)44.0 g/mol
D)11.3 g/mol
E)21.1 g/mol
Which of the following reactions will have a positive value of S°?
I. Pb(s) + Cl2(g) –> PbCl2(s)
II. 2H2S(g) + 3O2(g) –> 2H2O(g) + 2SO2(g)
III. K2SO4(s) –> 2K+(aq) + SO4
2-(aq)
A) I only
B) II only
C) III only
D) I and II
E) II and III
What is the density of oxygen gas, in g per liter, at 25 °C and 0.850 atm?
A)1.11
B)0.901
C)0.556
D)1.33
E)0.750
A gas is found to diffuse at half the rate of methane (CH4). Which of the following
could be this gas?
A)O2
B)N2
C)CO2
D)SO2
E)C2H6
A gas delivers 659 J of heat and then has 636J of work done upon it. The change in
internal energy of the gas is
A)1295 J
B)-23 J
C)23 J
D)-1295 J
E)none of these
In a standard phase diagram that plots temperature versus pressure, which one of the
following statements is TRUE?
A)Three phases coexist at equilibrium at any point along one of the lines that separate
regions (areas) on the phase diagram.
B)Two phases coexist at equilibrium at the triple point on the phase diagram.
C)The gas–solid line ends at a critical point on the phase diagram, beyond which
evaporation cannot occur.
D)The gas–liquid line ends at the critical point on the phase diagram, beyond which a
gas cannot be compressed to form a liquid.
E)In fact, all the above statements are false
Which of the following is not a fundamental metric unit?
A)meter C)gram
B)second D)mole