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Which of the following 0.01 M solutions has the highest pH?
A) HOAc
B) NaOAc
C) Na2CO3
D) H2CO3
E) NaHCO3
The oxidation of Cr3+ to CrO4
2- can be accomplished using Ce4+ in a buffered solution.
The following data were obtained:
Determine the order in the rate law of the species Ce3+.
A)1
B)2
C)3
D)-1
E)-2
In which case is the bond polarity incorrect?
A)δ+H—Fδ-
B)δ+K—Oδ-
C)δ+Mg—Hδ-
D)δ+Cl—Iδ-
E)δ+Si—Sδ-
The following questions refer to the gas-phase decomposition of ethylene chloride.
C2H5Cl --> products
Experiment shows that the decomposition is first order.
The following data show kinetics information for this reaction:
What is the rate constant for this decomposition?
A)0.29/s
B)0.35/s
C)0.11/s
D)0.02/s
E)0.22/s
Balance the following redox equation in acidic solution. What is the coefficient of the
water? CH3OH(aq) + Cr2O7
2-(aq) --> CH2O(aq) + Cr3+(aq)
A) 1
B) 2
C) 4
D) 6
E) 7
At 25°C, the following heats of reaction are known:
DH (kJ/mol)
2ClF + O2--> Cl2O + F2O167.4
2ClF3+ 2O2--> Cl2O + 3F2O341.4
2F2+ O2--> 2F2O-43.4
At the same temperature, calculate DH for the reaction: ClF + F2--> ClF3
A)-217.5 kJ/mol
B)-130.2 kJ/mol
C)+217.5 kJ/mol
D)-108.7 kJ/mol
E)none of these
In the quantum theory, the magnetic orbital momentum quantum number is most
directly associated with which property of orbitals?
A)energy
B)size
C)orientation
D)shape
Which of the following name(s) is(are) correct?
barium oxide, BaO
A)all
B)none
C)1, 2
D)3, 4
E)1, 3, 4
A sample of gas occupies 20.0 liters at 32 °C when the pressure is 0.750 atm. What
temperature in °C is required to increase the volume to 25.0 liters at a pressure of 0.680
atm?
A)-3.90 °C
B)309 °C
C)72.7 °C
D)346 °C
E)36.1 °C
The melting point of a certain element is 391°C. What is this on the Fahrenheit scale?
A)490°F
B)249°F
C)977°F
D)736°F
E)672°F
Equal volumes of the following pairs of solutions are mixed. Which pair will produce a
buffer solution?
A) 0.10 mol L-1HCl and 0.05 mol L-1NaOH
B) 0.10 mol L-1HCl and 0.15 mol L-1NH3
C) 0.10 mol L-1HCl and 0.05 mol L-1NH3
D) 0.10 mol L-1HCl and 0.20 mol L-1CH3COOH
E) 0.10 mol L-1HCl and 0.20 mol L-1NaCl
Which of the following solutions would be described as a buffer solution?
A) 0.25 M CH3COOH and 0.20 M HCl
B) 0.25 M CH3COOH and 0.20 M NaOH
C) 0.15 M NaBr and 0.20 M HBr
D) 0.25 M NH3and 0.15 M NaOH
E) 0.25 M HCl and 0.10 M NaOH
In which of the compounds below is there more than one kind of hybridization (sp, sp2,
sp3) for carbon?
I.CH3CH2CH2CH3
II.CH3CH = CHCH3
III.CH2= CH - CH = CH2
IV.H - C º C - H
A)II and III
B)II only
C)III and IV
D)I, II, and III
E)III only
Consider the following equilibrium: H2(g) + I2(s) 2HI(g)
The proper Keqexpression is:
A)
B)
C)
D)
E)
For the complete combustion of 1.000 mole of butane gas at 298 K and 1 atm pressure,
DH° = -2877 kJ/mol. What will be the heat released when 2.43 g of butane is
combusted under these conditions?
A)-121 kJ
B)121 kJ
C)68669 kJ
D)-68669 kJ
E)none of these
Calculate the lattice energy for LiCl(s) given the following:
sublimation energy for Li(s)+166 kJ/mol
DHffor Cl(g)+119 kJ/mol
first ionization energy of Li(g)+520. kJ/mol
electron affinity of Cl(g)-349 kJ/mol
enthalpy of formation of LiCl(s)-409 kJ/mol
A)47 kJ/mol
B)171 kJ/mol
C)−580 kJ/mol
D)−865 kJ/mol
E)none of these
Using the following data, calculate the standard heat of formation of the compound ICl
in kJ/mol:
DH° (kJ/mol)
Cl2(g) --> 2Cl(g)242.3
I2(g) --> 2I(g)151.0
ICl(g) --> I(g) + Cl(g)211.3
I2(s) --> I2(g)62.8
A)-211 kJ/mol
B)-14.6 kJ/mol
C)16.8 kJ/mol
D)245 kJ/mol
E)439 kJ/mol
A plastic bag is weighed and then filled successively with two gases, X and Y. The
following data are gathered:
Temperature: 0.0°C (273 K)
Pressure: 1.00 atmosphere
Mass of empty bag: 20.77 g
Mass of bag filled with gas X: 24.97 g
Mass of 1.12 liters of air at conditions given: 1.30 g
Volume of bag: 1.12 liter
Molar volume at STP: 22.4 liters
The bag is emptied and refilled, successively, with gases X and Y, this time at 1 atm
pressure and a temperature 30°C higher. Assume that the volume of the bag is the same
as before. Which one of the following statements is wrong?
A)The full bag contains fewer molecules of each gas than it did at 0.0°C.
B)The ratio of the density of gas Y to the density of gas X is the same as at 0.0°C.
C)The molar masses of the two gases are the same as they were at 0.0°C.
D)The mass of each gas filling the bag is now 303/273 times the mass held at 0.0°C.
E)The average velocity of the molecules of gas X at 30°C is higher than it was at 0.0°C.
Refer to the galvanic cell below (the contents of each half-cell are written beneath each
compartment):
The standard reduction potentials are as follows:
When current is allowed to flow, which species is oxidized?
A) Cr2O7
2-
B) Cr3+
C) MnO4
-
D) Mn2+
E) H+
What is the wavelength of light that is emitted when an excited electron in the hydrogen
atom falls from n=5 to n=1?
What is the mass of 4atom(s) of copper in grams?
Larger atomic or ionic radius, F or F-
Convert 44.7 to .
The questions below refer to the following information: The rate constant k for the
reaction shown below is 2.6 x 10-8 L/mol ' s when the reaction proceeds at 300.0 K. The
activation energy is 98000 J/mol. (The universal gas constant, R, is 8.314 J/mol·K)
2NOCl --> 2NO + Cl2
Determine the magnitude of the frequency factor for the reaction.
