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Exam 10: The Shapes of Molecules

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Question 31

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Predict the ideal bond angles around carbon in C₂I₂ using the molecular shape given by the VSEPR theory.

A) 90°
B) 109°
C) 120°
D) 180°
E) none of the above

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Question 32

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What is the molecular shape of NOCl as predicted by the VSEPR theory?

A) linear
B) trigonal planar
C) bent
D) tetrahedral
E) trigonal pyramidal

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Question 33

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What is the molecular shape of BeH₂ as predicted by the VSEPR theory?

Which one of the following Lewis structures is definitely incorrect?

According to VSEPR theory, a molecule with the general formula AX₅ will have a ______ molecular shape.

In which one of the following species is the central atom (the first atom in the formula) an exception to the octet rule?

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl₂.

Draw Lewis structures, showing all valence electrons, for: a. N b. Br^- c. O₂ d. SO₄^2-

According to VSEPR theory, a molecule with the general formula AX₂E₂ will have a _____ molecular shape.

Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90° bond angle in it. (In each case except water, the central atom is the first one in the formula.)

In formaldehyde, CH₂O, both the formal charge and the oxidation number of carbon are zero.

Bond angles of 180° only occur around atoms which display linear molecular geometry.

List the three important ways in which molecules can violate the octet rule, and in each case draw one Lewis structure of your choice as an example.

In order for a non-cyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

In which one of the following structures does the central atom have a formal charge of +2?

What is the molecular shape of the thiocyanate anion, SCN^-, as predicted by the VSEPR theory? (Carbon is the central atom.)

According to VSEPR theory, a molecule with the general formula AX₃E₂ will have a _____ molecular shape.

Select the best Lewis structure for ClCN.

The formal charges on Cl and O in the structure shown for the ClO^- ion are, respectively

In which one of the following is the best Lewis structure a resonance structure? (central atoms are bold)