Ch8 Molecular Shape And Structure Life In Full Test Bank

Chapter 8: Molecular shape and structure: life in three dimensions

Test Bank

Type: multiple choice question

Title: Chapter 08 - Question 01

1) Which of the following statements is true?

a. The atomic radius is the distance between two covalently bonded atoms of the same element.

b. The atomic radius is half the distance between two covalently bonded atoms of the same element.

c. The atomic radius is the distance between two covalently bonded atoms of different elements.

d. The atomic radius is half the distance between two covalently bonded atoms of different elements.

e. The atomic radius is the distance between two ionically bonded atoms of the same element.

Type: matching question

Title: Chapter 08 - Question 02

2) Place the following bonds in order of relative length, with 1 being the shortest and 3 being the longest.

Feedback: The general rule is that, as the number of electrons in a bond increases, the length of the bond decreases: a single bond contains two electrons, a double bond contains four, and a triple bond six. See Figure 8.5.

a. Single bond = 3

b. Double bond = 2

c. Triple bond = 1

Type: multiple choice question

Title: Chapter 08 - Question 03

3) A tetrahedral geometry typically exhibits which of the following bond angles?

a. 90°

b. 180°

c. 109.5°

d. 106.5°

e. 120°

Type: multiple response question

Title: Chapter 08 - Question 04

4) A trigonal bipyramidal geometry exhibits two characteristic bond angles. Which bond angles are these?

a. 90°

b. 109.5°

c. 120°

d. 180°

e. 45°

Type: matching question

Title: Chapter 08 - Question 05

5) Match the number of valence electron pairs with the type of geometry that they typically exhibit.

Feedback: Look at Table 8.1 for a reminder of the geometries that are exhibited by molecules possessing different numbers of valence electron pairs.

a. Tetrahedral = 4

b. Trigonal planar = 3

c. Linear = 2

d. Octahedral = 6

Type: matching question

Title: Chapter 08 - Question 06

6) Match the following geometries with the type of hybridized orbital that exhibits each geometry.

Feedback: Look at section 8.3 for a reminder of the geometries exhibited by different types of hybridized orbital.

a. Linear = sp

b. Trigonal planar = sp²

c. Tetrahedral = sp³

Type: multiple choice question

Title: Chapter 08 - Question 07

7) The ‘R’ in VSEPR theory denotes which the following words?

a. Resonance

b. Repulsion

c. Redistribution

d. Radius

e. Relationship

Type: multiple response question

Title: Chapter 08 - Question 08

8) Which of the following are taken into account when applying VSEPR theory? Select all that apply.

a. Sigma-bonding pairs

b. Pi-bonding pairs

c. Anti-bonding pairs

d. Non-bonding pairs

e. Unpaired valence electrons

Type: multiple choice question

Title: Chapter 08 - Question 09

9) Which of the following statements about non-bonding pairs is true?

a. Non-bonding pairs increase the typical bond angles associated with a particular geometry as predicted by VSEPR theory.

b. Non-bonding pairs decrease the typical bond angles associated with a particular geometry as predicted by VSEPR theory.

c. Non-bonding pairs have no effect on the typical bond angles associated with a particular geometry as predicted by VSEPR theory.

Type: multiple choice question

Title: Chapter 08 - Question 10

10) Bond rotation is possible about which of the following types of covalent bond?

a. Single bonds only

b. Double bonds only

c. Triple bonds only

d. None of these

e. Single bonds and double bonds

Type: multiple response question

Title: Chapter 08 - Question 11

11) Which of the following statements are false? Select all that apply.

sp hybridization results from the hybridization of one 2s and 2p orbital (and not two 2p orbitals), as illustrated in Figure 8.17.

Finally, hybridization can occur in molecules possessing both single and double bonds. When carbon and oxygen join via a double bond to form a carbonyl group, for example, both atoms become hybridized, as depicted in Figure 8.20.

All other statements are false.

a. sp³ hybridization generates three sp³ hybrid orbitals.

b. sp² hybridization leaves one 2p orbital unhybridized.

c. sp hybridization results from the hybridization of two 2p orbitals.

d. Hybridization occurs between atomics orbitals of the lowest-possible energy.

e. Hybridization only occurs in molecules possessing single covalent bonds.

Type: multiple response question

Title: Chapter 08 - Question 12

12) Rotation is possible about which of the following bonds along the backbone of a polypeptide chain? Select any that apply.

a. C^α–C

b. C^α–N

c. C–N (peptide)

Type: multiple choice question

Title: Chapter 08 - Question 13

13) Propane has the structural formula shown below. How many different conformations can propane exist in?

a. One

b. Two

c. Three

d. Four

e. An infinite number

Type: multiple choice question

Title: Chapter 08 - Question 14

14) A molecule of water adopts which one of the following geometries?

a. Linear

b. Trigonal planar

c. Octahedral

d. Tetrahedral

e. Trigonal bipyramidal

Type: multiple choice question

Title: Chapter 08 - Question 15

15) Carbon, hydrogen, nitrogen, and oxygen have the following atomic radii (in picometres): C = 77; H = 37; N = 74; O = 73. Which of the following covalent bonds is the shortest?

a. C–H

b. N–H

c. C–O

d. C–C

e. O–H

Type: multiple choice question

Title: Chapter 08 - Question 16

16) Carbon, hydrogen, nitrogen, and oxygen have the following atomic radii (in picometres): C = 77; H = 37; O = 73. Which of the following covalent bonds is the longest?

a. C–C

b. C–O

c. C=C

d. C–H

e. C≡C