Chemistry Chapter 8
Using VSEPR Theory, predict the electron-pair geometry of O3. a. linear b. tetrahedral c. triangular bipyramidal d. bent e. triangular planar
E
Which bond is least polar? a. CC b. CN c. NH d. CF e. CO
A
Write the correct Lewis dot structure for O2. Which statement correctly describes the structure of the whole molecule? a. There is a double bond and four lone pairs. b. There is a double bond and six lone pairs. c. There is a single bond and four lone pairs. d. There is a single bond and six lone pairs. e. There is a single bond, a double bond, and six lone pairs.
A
Use VSEPR Theory to predict the electron-pair geometry and the O-C-O bond angles for CO3 2 . a. tetrahedral, 90 b. triangular planar, 120 c. bent, 120 d. linear, 180 e. bent, 180
B
Use VSEPR Theory to predict the electron-pair geometry, the molecular geometry, and the Cl-S-Cl bond angle for SCl2. a. triangular bipyramidal, linear, 180 b. tetrahedral, bent, 109.5 c. tetrahedral, linear, 180 d. triangular planar, bent, 120
B
What is the formal charge on carbon in CO? a. 2 b. 1 c. 0 d. +1 e. +2
B
What is the formal charge on sulfur in SO2? a. +2 b. +1 c. 0 d. 1 e. 2
B
Which bond is longest? a. CO b. CP c. CH d. CC e. CN
B
Which element is the least electronegative? a. calcium b. cesium c. iron d. barium e. potassium
B
Which of the following compounds does not have tetrahedral electron-pair geometry? a. CCl4 b. NO2 c. H3O+ d. PCl3 e. H2O
B
Which statement about covalent bonds is false? a. Covalent bonds allow atoms to achieve a filled outermost electron shell. b. Covalent bonds are unreactive. c. Covalent bonds occur in molecular compounds. d. Covalent bonds involve valence electrons. e. Covalent bonds form between non-metal atoms.
B
VSEPR Theory attempts to ____ electron-pair ____. a. eliminate, attractions b. minimize, collisions c. minimize, repulsions d. maximize, attractions e. maximize, repulsions
C
Which statement about drawing Lewis dot structures is incorrect? a. The element chlorine has seven electrons in its Lewis symbol. b. One must subtract electrons when a anion is made. c. Three pairs of electrons are shared between two nuclei in a triple bond. d. Not every element will obey the octet rule. e. Period 2 elements , Li to Ne, are never allowed to exceed the octet rule.
B
Which statement properly describes the formal charges on the atoms in SO ? a. +2 on sulfur, 2 on oxygen b. +2 on sulfur, 1 on oxygen c. +1 on sulfur, 1 on oxygen d. 1 on sulfur, +2 on oxygen e. 2 on sulfur, 0 on oxygen
B
Determine the number of electrons that the four elements below require to obtain an octet of electrons. nitrogen oxygen carbon fluorine a. 1 3 2 4 b. 3 4 2 2 c. 3 2 4 1 d. 4 3 5 2 e. 5 6 4 7
C
How many electrons will be in the correctly drawn Lewis Structure for CH3CH3? a. 8 b. 10 c. 14 d. 18 e. 34
C
How many electrons will be in the correctly drawn Lewis Structure for CO ? a. 20 b. 22 c. 24 d. 26 e. 30
C
VSEPR is based upon what principle? a. The size of the electrons in the valence shell of a molecule determines the shape of the molecule. b. The velocity of the electrons in the valence shell of a molecule determines the shape of the molecule. c. The repulsion of electrons in the valence shell of a molecule determines the shape of the molecule. d. The attraction of electrons in the valence shell of a molecule determines the shape of the molecule. e. The mass of the electrons in the valence shell of a molecule determines the shape of the molecule.
C
What is the formal charge on carbon in CH2Cl2? a. 2 b. 1 c. 0 d. +1 e. +2
C
Which bond is longest? a. carbonoxygen triple bond b. carbonoxygen single bond c. carboncarbon single bond d. carboncarbon double bond e. carbonnitrogen triple bond
C
Which element is the most electronegative? a. sulfur b. iodine c. nitrogen d. aluminum e. carbon
C
Which element will have four electrons in its Lewis symbol? a. aluminum b. beryllium c. carbon d. magnesium e. oxygen
C
Which of the following represents a non-polar covalent bond? a. HO b. CN c. CC d. LiF e. SO
C
Which of the following statements could not describe a covalent bond? a. The sharing of two electrons between two atoms b. The sharing of four electrons between two atoms c. An electrostatic interaction between two oppositely charged ions d. The sharing of two or more electrons equally between two atoms e. The sharing of two or more electrons unequally between two atoms
C
Which statement properly describes the formal charges on the atoms in PO ? a. 2 on oxygen, +5 on phosphorus b. 1 on oxygen, +4 on phosphorus c. 1 on oxygen, +1 on phosphorus d. +1 on oxygen, 1 on phosphorus e. +1 on oxygen, 3 on phosphorus
C
Using VSEPR Theory, predict the electron-pair geometry and the molecular geometry of CO2. a. tetrahedral, linear b. tetrahedral, tetrahedral c. linear, bent d. bent, linear e. linear, linear
E
Determine, in order, the number of valence electrons that must be considered for the three compounds CO2, CH3Cl, HCN. a. 10, 14, 14 b. 10, 14, 10 c. 14, 26, 14 d. 16, 14, 10 e. 22, 26, 14
D
How many electrons will be in the correctly drawn Lewis Structure for CHCl3? a. 8 b. 16 c. 24 d. 26 e. 32
D
Which element will have five electrons in its Lewis symbol? a. argon b. boron c. carbon d. phosphorus e. sulfur
D
Write the correct Lewis dot structure for CCl2O. Which statement correctly describes the structure? a. The structure contains 3 single bonds, 1 double bond, and 2 lone pairs. b. The structure contains 3 single bonds, 1 triple bond, and 8 lone pairs. c. The structure contains 2 single bonds, 1 double bond, and 2 lone pairs. d. The structure contains 2 single bonds, 1 double bond and 8 lone pairs. e. The structure contains 1 single bond, 1 triple bond, and 2 lone pairs.
D
How many lone pairs of electrons does the Lewis dot structure of H2S have around its central atom and what is the shape of the molecule? a. 0, linear b. 0, bent c. 1, triangular planar d. 2, tetrahedral e. 2, bent
E
Select the element which never forms more than one bond in a Lewis Dot structure. a. O b. C c. N d. Al e. H
E
Using VSEPR Theory, predict the geometry for two, three, four, five, and six electron domains, respectively. a. linear, triangular pyramidal, tetrahedral, triangular bipyramidal, octahedral b. linear, triangular planar, tetrahedral, square pyramidal, octahedral c. bent, triangular pyramidal, tetrahedral, triangular pyramidal, octahedral d. linear, triangular planar, tetrahedral, T-shaped, hexagonal e. linear, triangular planar, tetrahedral, triangular bipyramidal, octahedral
E
Which element is the most electronegative? a. phosphorus b. silicon c. carbon d. nitrogen e. oxygen
E
Which statement concerning the interaction between two atoms is incorrect? a. If two atoms are widely separated, there is very little attraction between them. b. When two atoms are one bond length apart, the electrons on one atom are attracted to the nucleus of the other atom. c. When two atoms have very little separation between them, repulsion occurs. d. A covalent bond occurs when electrons are shared between two nuclei. e. As atoms get closer together, their electrons attract each other.
E
Write the correct Lewis dot structure for N2. Which statement correctly describes the structure? a. The structure contains 1 single bond 5 lone pairs. b. The structure contains 1 double bond and 4 lone pairs. c. The structure contains 1 double bond and 5 lone pairs. d. The structure contains 1 double bond and 6 lone pairs. e. The structure contains 1 triple bond and 2 lone pairs.
E
