A certain atom has the symbol ___. What does this symbol tell about an atom of the element?
A. It has 148 electrons
B. It has 4 valence
C. It has 221 protons in the nucleus
D. It has 75 neutrons in the nucleus
D. It has 75 neutrons in the nucleus
100
Write the equilibrium constant for the following reaction:
FeCl3(s) --> Fe(+3)(aq) + 3Cl(-)(aq)
Write it down!
[Fe(+3)][Cl(-)]^3
100
The reaction 4Ag(s) + O2(g) --> 2Ag2O(s), is exothermic. Which statement about the reaction is correct?
A. It is spontaneous at all temperatures
B. It is spontaneous only at low temperatures
C. It is spontaneous only at high temperatures
D. It is non-spontaneous at all temperatures
B. It is spontaneous only at low temperatures
100
If each of these ions were reduced to metal with one coulomb, which would yield the greatest mass?
A. Cu+2
B. Ag+
C. Hg+2
D. Cu+
B. Ag+
100
When equal volumes of 0.1M HCl and NaOH are mixed, the total number of ions present will be approximately:
A. twice as great
B. half as great
C. the same
D. 1x10^-7 as great
B. half as great
200
The atomic mass of an element is 32.07 u and its atomic number is 16. The element forms a simple ion. The ion will most likely have a charge of
A. 1-
B. 2-
C. 3+
D. 1+
B. 2-
200
Which is always true for a specific system during a spontaneous reaction?
A. ΔH < 0
B. ΔH ≥ 0
C. ΔG < 0
D. ΔS > 0
C. ΔG < 0
200
In which process does entropy decrease?
A. dissolving sugar in water
B. expanding a gas
C. evaporating a liquid
D. freezing water
D. freezing water
200
Given the following standard reduction potentials, which of these reagents would be the best oxidizing agent?
A. Cd+2 : -0.40
B. Br2(l) : 1.08
C. Ni+2 : -0.25
D. Ag+ : 0.80
B. Br2(l) : 1.08
200
How would you make 1 L of a 1 M solution of NaCl?
A. Measure out 1 L of water in a graduated cylinder; combine that and 58.44 g NaCl in a beaker
B. Combine 1 L of water and 58.44 g NaCl in a flask
C. Place 58.44 g NaCl in beaker; add 1 L water; mix
D. Place 58.44 g NaCl in a flask; add some water to dissolve salt; fill flask to the 1 L mark
D. Place 58.44 g NaCl in a flask; add some water to dissolve salt; fill flash to the 1 L line
300
Which pair of elements are most likely to react to form a covalently bonded species?
A. P and O
B. Ca and O
C. K and S
D. P and S
A. P and O
300
Which is the weakest acid?
A. ascorbic acid (Ka = 8.0×10–5)
B. boric acid (Ka = 5.8×10–10)
C. butyric acid (Ka = 1.5×10–5)
D. hydrocyanic acid (Ka = 4.9×10–10)
D. hydrocyanic acid (Ka = 4.9×10–10)
300
What is the standard enthalpy of formation of ethylene if its standard enthalpy of combustion is -1411 Kj/mol?
CO2(g): -394 Kj/mol
H2O(l): -286 Kj/mol
A. 1411 kj/mol
B. 51 kj/mol
C. -337 kj/mol
D. -445 kj/mol
B. 51 kj/mol
C2H4 + 3O2 --> 2CO2 + 2H2O
300
For the following reaction, A + 2B --> 3C, when A is doubled, the rate quadruples. When B is tripled, the rate doesn't change. What is the order of the reaction?
A. Zero
B. First
C. Second
D. Third
C. Second order
300
The substrates below have molar masses that are the same within about 2 g/mol. Which substance has the lowest boiling point?
A. CH3CH2CH3
B. CH3OCH3
C. CH3CH2OH
D. CH3CHO
A. CH3CH2CH3
400
What is the electron and molecular geometry of PCl3?
A. linear and linear
B. trigonal planar and bent
C. trigonal bipyramidal and t-shaped
D. tetrahedral and trigonal pyramidal
D. tetrahedral and trigonal pyramidal
400
Put the following electromagnetic radiations in increasing order of wavelength: radio waves, gamma rays, microwaves, ultraviolet, and infrared
gamma rays, ultraviolet, infrared, microwaves, and radiowaves
400
Which reaction has the largest positive entropy change per mole of product formed?
A. S(s) + 3F2(g) --> SF6(g)
B. SO2(g) + Na2O(s) --> Na2SO3(s)
C. Fe+3(aq) + SCN-(aq) --> FeSCN+2(aq)
D. H2O(l) --> H2O(g)
D. H2O(l) --> H2O(g)
400
What time is required to plate 2.08g of copper at a constant current flow of 1.26 A? MM Cu: 63.5 g/mol
A. 41.8 min
B. 83.6 min
C. 128 min
D. 4820 min
B. 83.6 min
400
In which pair of substances do the nitrogen atoms have the same oxidation state?
A. HNO3 and N2O5
B. HNO2 and HNO3
C. N2 and N2O
A. HNO3 and N2O5
500
Which chloride should exhibit the most covalent type of bond?
A. NaCl
B. KCl
C. CaCl2
D. BaCl2
E. BeCl2
E. BeCl2
500
How many pi bonds are present un a molecule of 1-butyne?
A. one
B. two
C. three
D. four
B. two
500
The standard enthalpy of formation for NH3(g) is -46.1 kj/mol. Calculate H for the reaction.
2NH3(g) --> N2(g) + 3H2(g)
A. -92.2 kj
B. -46.1 kj
C. 46.1 kj
D. 92.2 kj
D. 92.2 kj
500
Which statement most accurately describes the behavior of a catalyst?
A. A catalyst increase the ΔG of a reaction and hence the forward rate.
B. A catalyst reduces the ΔH of a reaction and hence the temperature needed to produce products
C. A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.
D. A catalyst increases the equilibrium constant and final product concentrations.
C. A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.
500
What is the ground state electron configuration of Co (27) atom in the gas phase?
A. 1s(2)2s(2)2p(6)3s(2)3p(6)3d(7)
B. 1s(2)2s(2)2p(6)3s(2)3p(6)3d(9)
C. 1s(2)2s(2)2p(6)3s(2)3p(6)3d(8)4s(1)
D. 1s(2)2s(2)2p(6)3s(2)3p(6)3d(7)4s(1)