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- 1. Multiple Choice
According to the following reaction, how many grams of ammonia will be formed upon the complete reactions of 15.8 grams of nitrogen gas with excess hydrogen gas?
9.60 grams ammonia
19.2 grams ammonia
38.4 grams ammonia
4.80 grams ammonia
- 2. Multiple Choice
A sample of a hydrate of Na2CO3 with a mass of 550 grams was heated until all the water was removed. The sample was then weighed and found to have a mass of 300 grams. What is the formula for the hydrate?
Na2CO3 ⋅ 4H2O
Na2CO3 ⋅ 10H2O
Na2CO3 ⋅ 3H2O
Na2CO3 ⋅ 5H2O
- 3. Multiple Choice
Al2O3(l) → Al(s) + O2(g)
Approximately how many liters of oxygen gas will be evolved at STP, if 25.68 grams of alumina decomposes?
22.4 L
8.46 L
5.64 L
11.2 L
- 4. Multiple Choice
The mass spectrum represented above is most consistent with which of the following elements?
Nb
Zr
Y
Mo
- 5. Multiple Choice
An element consists of 94.93% of an isotope with mass 31.97 u, 0.76% of an isotope with mass 32.97 u, 4.29% of an isotope with mass 33.97 u, and 0.02% of an isotope with mass 35.97 u. Calculate the average atomic mass, and identify the element.
32.06,S
32.07,P
3206,S
3207,P
- 6. Multiple Choice
The element boron (B) has two naturally occurring isotopes, 10B and 11B, with an average atomic mass of 10.812 u. Boron is 80.2 % 11B, and the atomic mass of 11B is 11.009 u. Calculate the mass of 10B.
10.5 u
11.01 u
10.01 u
10.8 u
- 7. Multiple Choice
The molecule drawn above has the same empirical formula as another compound "X" with a molar mass of 265.1.
Determine the molecular formula of compound "X".
C2H3O
C4H6O2
C12H18O6
C8H12O4
- 8. Multiple Choice
A compound contains only carbon, hydrogen, and oxygen. Combustion of 15.36 mg of the compound yields 9.56 mg CO2 and 1.80 mg H2O. The molar mass of the compound is 120.2 g/mol. What is the molecular formula of the compound?
CHO4
C2H2O6
C3H12O3
C3H3O12
- 9. Multiple Choice
A compound containing only calcium, oxygen, and carbon is 45.3% Ca and 20.5% O by mass; the molar mass is 525 g/mol. What is the molecular formula of the compound?
Ca2O2C5
CaOC2.5
Ca6O6C15
Ca2O2C6
- 10. Multiple Choice
A sample of a compound is a mixture of FNO3 and ClNO3. The compound is analyzed in a laboratory, and the results are recorded in the table above. Calculate the mole ratio of Cl to F in the compound?
2:1
1:2
3:2
2:3
- 11. Multiple Choice
A 3.45 g iron supplement contains 53.7% Fe by mass. The iron is present in the supplement as C4H2Fe3O4(s) (molar mass 281.61 g/mol).
How many grams of C4H2Fe3O4(s) are in the iron supplement?
5.80 g C4H2Fe3O4
3.11 g C4H2Fe3O4
4.56 g C4H2Fe3O4
9.34 g C4H2Fe3O4
- 12. Multiple Choice
A student determines that a 205.78 g mixture MgCl2 (s) and NaNO3(s) contains 1.070 mol of MgCl2(s).
Based on the student’s measurement, what is the mass percent of Cl in the mixture?
25%
35%
37%
30%
- 13. Multiple Choice
The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 4p6 3d5 represents which of the following? (Select all that apply)
Ge+7
Fe+1
Ca-4
K-6
Mn
- 14. Multiple Choice
Which one of the following configurations depicts a chalcogen?
1s2 2s2 2p5
[Ar] 4s2 3d10 4p4
[Ne] 3s2 3p6
[Kr] 5s2 4d10 5p3
- 15. Multiple Choice
Which of the following ions has the same number of electrons as As2+?
Ge-
Br4-
Cu2-
Ga2+
- 16. Multiple Choice
What element does this PES graph represent?
Oxygen
Boron
Carbon
Nitrogen
- 17. Multiple Choice
Which peak represents the 3p subshell?
The peak at 104 MJ/mol
The peak at 6.84 MJ/mol
The peak at 2.29 MJ/mol
The peak at 1.76 MJ/mol
- 18. Multiple Choice
Which of the following statements best accounts for the 2p peak being twice the height of the 2s peak?
The height of peaks in a photo-electron spectrum does not have any relation to the structure of an atom.
In a photo-electron spectrum, as binding energy increases the relative number of electrons decreases.
The intensity of the photo-electron signal at a given energy is a measure of the number of electrons in that energy level.
Electrons represented by peak 2s have approximately triple the binding energy than those represented by peak 2p.
- 19. Multiple Choice
Which is a list of elements in order of increasing first ionization energy?
Cl, P, Si
N, P, As
Sr, Ca, Mg
Cl, Br, I
F, Ne, Na
- 20. Multiple Choice
Which of the following statements is true regarding Nitrogen and Sulfur?
Nitrogen has a smaller atomic radius and a greater electronegativity.
Sulfur has a smaller atomic radius and a greater electronegativity.
Nitrogen has a larger atomic radius and a larger first ionization energy.
Sulfur has a larger atomic radius and a larger first ionization energy.
- 21. Multiple Choice
The diagram above shows the relative atomic sizes of three different elements from the same period. Which of the following statements must be true? (Select all that apply)
The electronegativity value will be greatest in element X.
The first ionization energy will be greatest in element Z.
The electron shielding effect will be greatest in element Z.
The effective nuclear charge will be the greatest in element Z.
The effective nuclear charge will be the greatest in element X.
- 22. Multiple Choice
The ionization energies for an element are listed in the table above.
Based on the ionization energy table, the element is most likely to be
sulfur
phosphorus
chlorine
argon
- 23. Multiple Choice
The ionization energies for an element are listed in the table above.
Based on the ionization energy table, how many valence electrons does this element have?
1
2
3
4
5
- 24. Multiple Choice
Suppose that a stable element with atomic number 120, symbol X, has been discovered.
Write the ground-state electron configuration for X, showing only the valence-shell electrons.
7s2 7p5
7s2 7p6
8s1
8s2
- 25. Multiple Choice
Suppose that a stable element with atomic number 120, symbol X, has been discovered. Assume that X reacts to form a carbonate compound.
Write the formula for the compound formed between X and the carbonate ion, CO32-.
X2CO3
XCO3
X(CO3)2
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