Liquid Chromatography
9.1 Orbitals and Theories of Chemical Bonding
1. Which one of the statements concerning valence bond (VB) and molecular orbital (MO) bond theories is correct? a) MO theory predicts that electrons are localized between pairs of atoms. b) In VB theory, bonding electrons are delocalized over the molecule. c) MO theory accurately describes bonding in O2 and NO, VB theory does not. d) VB theory can describe molecular bonding in excited states. e) MO theory is used to accurately predict the colors of compounds.
Answer: c
9.2 Valence Bond Theory
2. Which of the following statements is/are CORRECT? 1. The overlap between an s orbital and a p orbital is called a pi-bond. 2. The overlap of two s orbitals in H2 is called a sigma bond. 3. HF is formed from the overlap of a hydrogen 1s orbital with a fluorine 2s orbital. a) 1 only b) 2 only c) 3 only d) 2 and 3 e) 1, 2, and 3
Answer: b
3. Which of the following statements concerning hybrid orbitals is/are CORRECT? 1. The number of hybrid orbitals equals the number of atomic orbitals that are used to create the hybrids. 2. When atomic orbitals are hybridized, the s orbital and at least one p orbital are always hybridized. 3. To create octahedral structures, two d orbitals must be hybridized along with the s and all three p orbitals. a) 1 only b) 2 only c) 3 only d) 2 and 3 e) 1, 2, and 3
Answer: e
4. How many sigma (σ) bonds and pi (π) bonds are in ethene, C2H4? a) four σ, one π b) four σ, two π c) five σ, one π d) five σ, two π e) six σ, zero π
Answer: c
5. How many sigma (σ) bonds and pi (π) bonds are in carbon monoxide? a) three σ, zero π b) two σ, one π c) two σ, two π d) one σ, two π e) zero σ, three π
Answer: d
6. How many sigma (σ) bonds and pi (π) bonds are in the following molecule?
a) seven σ and three π b) seven σ and two π c) five σ and five π d) five σ and three π e) five σ and two π
Answer: a
7. To form
1. Which one of the statements concerning valence bond (VB) and molecular orbital (MO) bond theories is correct? a) MO theory predicts that electrons are localized between pairs of atoms. b) In VB theory, bonding electrons are delocalized over the molecule. c) MO theory accurately describes bonding in O2 and NO, VB theory does not. d) VB theory can describe molecular bonding in excited states. e) MO theory is used to accurately predict the colors of compounds.
Answer: c
9.2 Valence Bond Theory
2. Which of the following statements is/are CORRECT? 1. The overlap between an s orbital and a p orbital is called a pi-bond. 2. The overlap of two s orbitals in H2 is called a sigma bond. 3. HF is formed from the overlap of a hydrogen 1s orbital with a fluorine 2s orbital. a) 1 only b) 2 only c) 3 only d) 2 and 3 e) 1, 2, and 3
Answer: b
3. Which of the following statements concerning hybrid orbitals is/are CORRECT? 1. The number of hybrid orbitals equals the number of atomic orbitals that are used to create the hybrids. 2. When atomic orbitals are hybridized, the s orbital and at least one p orbital are always hybridized. 3. To create octahedral structures, two d orbitals must be hybridized along with the s and all three p orbitals. a) 1 only b) 2 only c) 3 only d) 2 and 3 e) 1, 2, and 3
Answer: e
4. How many sigma (σ) bonds and pi (π) bonds are in ethene, C2H4? a) four σ, one π b) four σ, two π c) five σ, one π d) five σ, two π e) six σ, zero π
Answer: c
5. How many sigma (σ) bonds and pi (π) bonds are in carbon monoxide? a) three σ, zero π b) two σ, one π c) two σ, two π d) one σ, two π e) zero σ, three π
Answer: d
6. How many sigma (σ) bonds and pi (π) bonds are in the following molecule?
a) seven σ and three π b) seven σ and two π c) five σ and five π d) five σ and three π e) five σ and two π
Answer: a
7. To form