19. The constant pressure heat capacity (cp) generally increases with
(A)the mass of the molecule
(B)the internal degrees of freedom in the molecule
(C)the number of atoms in the molecule
(D)a and c
(E)b and c

1. Iron oxide can be reduced to iron by a reaction with carbon to form carbon monoxide Fe2O3(s) + 3C(s) -＞ 2Fe(s) + 3CO(g) If 95.0 grams of iron oxide is reacted with excess carbon yields 63.0 g of iron, what is the percent yield of this reaction? (A)12% (B)59% (C)66% (D)95% (E)100%

2. Choose the best statement regarding why diagram I is the better choice between these two Lewis diagrams for N2O (I) :N≡N-O: (II) :N:=N=:O: (A)because II does not satisfy the octet rule for all atoms. (B)because structure I has fewer formal charges than II. (C)because structure I has the negative formal charge on the most electronegative atom. (D)because structure I has the positive formal charge on the most electronegative atom. (E)the best structure is actually structure II.

3. What is the probability of finding a particle in a box of length L between zero and L/2? (A)1 (B)0.5 (C)0.25 (D)L/2 (E)it depends on the quantum number n

4. A material is made from Al, Ga, and As. The mole fractions of these elements are 0.25, 0.26, and 0.49, respectively. This material would be (A)a metallic conductor because Al is present. (B)an insulator. (C)a p-type semiconductor. (D)an n-type semiconductor. (E)none of these

5. The uncertainty in the velocity of an electron is 1x10^5 m s^-1. What is the minimum uncertainty in its position? (A)5.79x10^-5 m (B)2.31x10^-9 m (C)5.79x10^-10 m (D)2.31x10^-10 m (E)1.08x10^-10 m

6. Rank from smallest to largest in terms of atom/ionic radii. (A)S2-, Cl-, Ar, K+, Ca2+ (B)Ca2+, K+, Ar, Cl-, S2- (C)Ca2+, S2-, K+, Cl-, Ar (D)Ar, K+, Cl-, Ca2+, S2- (E)Ar, Cl-, K+, S2-, Ca2+

7. Which of the following sets of quantum numbers is allowed for an electron in a one electron atom? (A)n=4, l=3, m=3, ms=0 (B)n=3, l=1, m=2, ms=-1/2 (C)n=2, l=0, m=1, ms=1/2 (D)n=2, l=3, m=3, ms=1/2 (E)n=6, l=5, m=-3, ms=-1/2

8. A Lewis dot structure for benzene, C6H6 would give two equivalent resonance structures for this cyclic molecule with alternating single and double bonds. A combined LCAO and MO picture for the bonding of the carbon atoms in benzene would be (A)1σ(Csp2-Csp2) bonds between each C atom, and 3π MO delocalized over the C's (B)2σ(Csp3-Csp3) bonds between each C atom, and 1π MO delocalized over the C's (C)1σ(Csp3-Csp3) bonds between each C atom, and 1π MO delocalized over the C's (D)1σ(Csp2-Csp2) bonds between each C atom, and 2π MO delocalized over the C's (E)3σ(C2p-C2p) bonds between each C atom

9. Which of the following has the highest bond order O2, NO, N2, NO+? (A)O2 (B)NO (C)N2 (D)NO+ (E)N2 and NO+ are the same and the highest

10. How many different isomers exist for Dichloro-ethene, C2H2Cl2? (A)0 (B)1 (C)2 (D)3 (E)4

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