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1. Twenty-five percent of element X exists as 210X and 75 percent of it exists as 214X. What is the atomic weight of element X in amu?
A. 85B. 211C. 212D. 213E. 214
2. A 600-milliliter container holds 2 moles of O2(g), 3 moles of H2(g), and 1 mole of He(g). Total pressure within the container is 760 torr. What is the partial pressure of O2?
A. 127 torrB. 253 torrC. 380 torrD. 507 torrE. 760 torr
3. Fe(OH)3(s) Fe3+(aq) + 3OH–(aq)
The ionic solid Fe(OH)3 is added to water and dissociates into its component ions, as shown above. The solubility product expression for the saturated solution is
A. Ksp = [Fe3+] [OH–]B. Ksp = [Fe3+] [3OH–]C. Ksp = [Fe3+] [3OH–]3D. Ksp = [Fe3+] [OH–]3E. Ksp =
4. Which of the following electron configurations represents an atom of magnesium in an excited state?
A. 1s22s22p6B. 1s22s22p63s2C. 1s22s22p53s23p2D. 1s22s22p63s13p1E. 1s22s22p63s13p2
5. All of the following when added to water will produce an electrolytic solution EXCEPT
A. N2(g)B. HCl(g)C. KOH(s)D. NaI(s)E. CaCl2(s)
6. NH3 (aq) + H2CO3 (aq) NH4+(aq) + HCO3– (aq)
In the reaction represented above, NH4+ acts as a(n)
A. indicatorB. hydrateC. acidD. baseE. salt
7. Which species has the ground state electron configuration 1s22s22p63s23p6?
A. Sulfide ion, S2–B. Bromide ion, Br–C. Neon atom, NeD. Chromium ion, Cr3+E. Potassium atom, K
8. Which of the following species is amphoteric?
A. Na3PO4B. HSO4–C. KOHD. HNO3E. C2O2–4
9. An ideal gas has a volume of 10 liters at 20°C and a pressure of 750 mmHg. Which of the following expressions is needed to determine the volume of the same amount of gas at STP?
A. B. C. D. E.
10. Substance Z is at 0.5 atm and 200 K. If the pressure on substance Z is steadily increased and its temperature is kept constant, what phase change will eventually occur?
A. CondensationB. FreezingC. MeltingD. SublimationE. Vaporization
11. The normal boiling point of substance Z is closest to
A. 100 KB. 200 KC. 300 KD. 400 KE. 500 K
12. The shape of a PCl3 molecule is described as
A. bentB. trigonal pyramidalC. linearD. trigonal planarE. tetrahedral
13. What volume of 0.4 M Ba(OH)2 (aq) is needed to exactly neutralize 100 milliliters of 0.2 M HBr(aq)?
A. 25 mLB. 50 mLC. 100 mLD. 200 mLE. 400 mL
14. Which of the following is true regarding the aqueous dissociation of HCN, Ka = 4.9 × 10–10 at 25°C?
I. At equilibrium, [H+] = [CN–]
II. At equilibrium, [H+] > [HCN]
III. HCN(aq) is a strong acid.
A. I onlyB. II onlyC. I and II onlyD. II and III onlyE. I, II, and III
15. Which of the following atoms has the largest second ionization energy?
A. Silicon, SiB. Calcium, CaC. Chlorine, ClD. Iron, FeE. Sodium, Na
16. Question below refers to the overall reaction and half-reactions with standard reduction potentials below.
2Fe2+ + Cl2 → 2Fe3+ + 2Cl?
Fe3+ + e– → Fe2+; Eored = 0.77 volts
Cl2 + 2e– → 2Cl–; Eored = 1.36 volts
62.The standard potential difference of an electro-chemical cell using the overall reaction above is
A. 0.18 voltsB. 0.59 voltsC. 1.05 voltsD. 2.13 voltsE. 2.90 volts
17. The reaction of zinc metal, Zn, and hydrochloric acid, HCl, produces which of the following?
A. II onlyB. III onlyC. I and II onlyD. I and III onlyE. I, II, and III
18. 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) + heat
For the above reaction, the equilibrium concentration of SO2(g) can be increased by
A. adding neon gasB. increasing the temperatureC. adding a catalystD. increasing the concentration of H2O(g)E. increasing the concentration of O2(g)
19. 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) + heat
Which of the following is increased by decreasing the volume of the reaction system?
I. Rate of reaction
II. Equilibrium concentration of reactants
III. Value of Keq
A. I onlyB. III onlyC. I and II onlyD. II and III onlyE. I, II, and III
20. 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) + heat
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
When 3 moles of Fe2O3 are allowed to completely react with 56 grams of CO according to the above equation, approximately how many moles of iron, Fe, are produced?
A. 0.7B. 1.3C. 2D. 2.7E. 6
21. 2Na2O2(s) + 2H2O(l) → 4NaOH(aq) + O2(g)
Sodium peroxide, Na2O2, and water react in the flask at 25°C according to the equation and in the diagram above. If water levels are equal inside and outside the beaker, then the gas pressure inside the beaker is equal to the
A. pressure of oxygen gas collectedB. vapor pressure of water at 25°CC. sum of pressure of oxygen gas collected and atmospheric pressureD. sum of vapor pressure of water at 25°C and atmospheric pressureE. sum of pressure of oxygen gas collected and vapor pressure of water at 25°C
22. Which of the following molecules has the strongest carbon-to-carbon bond?
A. C2H2B. C2H4C. C2H6D. C3H8E. C4H10
23. N2O4(g) 2NO2(g)
The following concentration data were gathered for the above reaction at 5 minute intervals from the start of an experiment:
If the experiment was carried out in a closed system at constant temperature, then during which time interval (from the start of the experiment) did the reaction most likely achieve equilibrium?
A. 0 min (start) to 5 minB. 5 min to 10 minC. 10 min to 15 minD. 15 min to 20 minE. 20 min to 25 min
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