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SLG Practice Final Exam
Chem. 113
True and False
1. The Bohr Theory explains that an emission spectral line is due to an electron losing energy and changing orbitals.
2. 4s orbitals have higher energy than 3d orbitals.
3. An atom with an even number of electrons is always diamagnetic.
4. Covalent bonds are formed by atoms sharing electrons. Multiple Choice
5. Choose the INCORRECT statement about NH2-:
a) There is one lone pair on N.
b) There are two σ bonds.
c) There are no π bonds.
d) The molecule is bent.
e) N is sp3 hybridized.
6. According to M.O. theory, assuming that the molecular orbits are the same as the diatomic molecule, which is an INCORRECT statement for CN-?
a) There are 10 electrons in the n=2 level orbitals. b) The σ2p is the highest filled level.
c) The B.O. is 2.
d) The molecule is diamagnetic.
e) There are no unpaired electrons.
7. Which probably has the highest boiling point at
1 atm pressure?
a) (CH3)2CHNH2
b) (CH3)3N
c) CH3CH2NHCH3
d) CH3CH2CH2NH2
e) H2NCH2CH2NH2
8. Which of the following ionic compounds should have the highest melting point?
a) LiBr
b) MgO
c) NaI
d) CaS
e) NaCl
9. Given the bond enthalpies N-H (389), Cl-Cl
(243), N-Cl (201), H-Cl (431) in kJ/mol, compute ΔH in kJ/mol for:
NH3 + Cl2 NH2Cl+ HCl
a) 0
b) -393
c) -110
d) +393
e) +71
10. Which of the following molecules contains both ionic and covalent bonds?
a) C6H14
b) MgCl2
c) (NH4)2SO4
d) H2O
11. A polar solute is poured into a container with a nonpolar solvent. Which of the following statements best explains the reaction?
a) The strong dipoles of the polar molecules separate the weak bonds between the nonpolar molecules. b) The dipoles of the polar molecules are too weak to break the bonds between the nonpolar molecules. c) The instantaneous dipoles of the nonpolar molecules are too weak to separate the bonds between the polar molecules.
d) The instantaneous dipoles of the nonpolar
Chem. 113
True and False
1. The Bohr Theory explains that an emission spectral line is due to an electron losing energy and changing orbitals.
2. 4s orbitals have higher energy than 3d orbitals.
3. An atom with an even number of electrons is always diamagnetic.
4. Covalent bonds are formed by atoms sharing electrons. Multiple Choice
5. Choose the INCORRECT statement about NH2-:
a) There is one lone pair on N.
b) There are two σ bonds.
c) There are no π bonds.
d) The molecule is bent.
e) N is sp3 hybridized.
6. According to M.O. theory, assuming that the molecular orbits are the same as the diatomic molecule, which is an INCORRECT statement for CN-?
a) There are 10 electrons in the n=2 level orbitals. b) The σ2p is the highest filled level.
c) The B.O. is 2.
d) The molecule is diamagnetic.
e) There are no unpaired electrons.
7. Which probably has the highest boiling point at
1 atm pressure?
a) (CH3)2CHNH2
b) (CH3)3N
c) CH3CH2NHCH3
d) CH3CH2CH2NH2
e) H2NCH2CH2NH2
8. Which of the following ionic compounds should have the highest melting point?
a) LiBr
b) MgO
c) NaI
d) CaS
e) NaCl
9. Given the bond enthalpies N-H (389), Cl-Cl
(243), N-Cl (201), H-Cl (431) in kJ/mol, compute ΔH in kJ/mol for:
NH3 + Cl2 NH2Cl+ HCl
a) 0
b) -393
c) -110
d) +393
e) +71
10. Which of the following molecules contains both ionic and covalent bonds?
a) C6H14
b) MgCl2
c) (NH4)2SO4
d) H2O
11. A polar solute is poured into a container with a nonpolar solvent. Which of the following statements best explains the reaction?
a) The strong dipoles of the polar molecules separate the weak bonds between the nonpolar molecules. b) The dipoles of the polar molecules are too weak to break the bonds between the nonpolar molecules. c) The instantaneous dipoles of the nonpolar molecules are too weak to separate the bonds between the polar molecules.
d) The instantaneous dipoles of the nonpolar