CHEM125 – CHAPTER 10 – BASIC HOMEWORK

CHAPTER 10 BASIC HOMEWORK

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Question 1

Determine the geometry or shape of a MgH2 molecule. Check those statements which are correct. Help: VSEPR
Select one or more:
 Correct
 Correct
 Correct

Explanation

MgH2 : 2+ 2= 4 electrons

Mg : 2 bonds = 2 steric number
2 bonds + 0 lone pairs = linear

Question 2

Determine the geometry or shape of a BCl2 ion. Hint in general feedback
Select one or more:
 Correct
 Correct
 Correct

Explanation

BCl2– : 3 + ( 2*7) + 1 =18 electrons

B: 2 bonds + 1 lone pair = 3 steric number
2 bonds + 1 lone pair = bent

Question 3

Determine the geometry or shape of a SiF4 molecule. Hint in general feedback
Select one or more:
 Correct
 Correct
 Correct

Explanation

SiF4: 4 + ( 4*7) =32 electrons B: 4 bonds + 0 lone pair = 4 steric number
4 bonds + 0 lone pair = tetrahedral

Question 4

Determine the geometry or shape of a CO2 molecule. Hint in general feedback
Select one or more:
 Correct
 Correct
 Correct

Explanation

CO2 : 4 + (6*2) = 16 C: 2 bonds + 0 lone pairs = 2 steric number 2 bonds + 0 lone pair = linear

Question 5

Draw the Lewis structure and shape for the phosphine, PH3. Which of the following statements are correct. Help: Geometry and shapes
Select one or more:
 Correct
 Correct
 Correct

Explanation

 PH3 : 5+ ( 1 * 3) = 8 C: 3 bonds + 1 lone pairs = 4 steric number 3 bonds + 1 lone pair = trigonal pyramidal
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 1

Question 6

Draw the Lewis structure and shape for PCl5. Which of the following statements are correct.
Select one or more:
 Correct
 Correct
 Correct

Explanation

PCl 5 : 5 +( 7*5) = 40 P: 5 bonds + 0 lone pairs = 5 steric number 5 bonds + 0 lone pair =trigonal bipyramidal
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 2

Question 7

Draw the Lewis structure and shape for SF6. Which of the following statements are correct.
Select one or more:
 Correct
 Correct
 Correct

Explanation

SF6 : 6 +( 6*7) = 48 P: 6 bonds + 0 lone pairs = 6 steric number 6 bonds + 0 lone pair = octahedral
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 3

Question 8

Draw the Lewis structure and shape for XeF4. Which of the following statements are correct.
Select one or more:
 Correct
 Correct
 Correct

Explanation

XeF4: 8 +( 4*7) = 36 P: 4 bonds + 2 lone pairs = 6 steric number 4 bonds + 2 lone pairs = square planar.

Question 9

Which of the following statements are correct regarding the BeF2 molecule? Help: Bond polarity
Select one or more:
 Correct
 Correct
 Correct

Explanation

CHEM125 - CHAPTER 10 - BASIC HOMEWORK 4
F is polarized with negative charge because it is more electronegative
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 5

Question 10

Which of the following statements are correct regarding the BeClF molecule? Hint given in feedback
Select one or more:
 Correct
 Correct
 Correct

Explanation

The molecule is linear; however, B-Cl and B-F bond polarities are different. So, they do not completely cancel.

Question 11

Which of the following statements are correct regarding the BF2 ion?
Select one or more:
 Correct
 Correct

Explanation

CHEM125 - CHAPTER 10 - BASIC HOMEWORK 6
The molecule is not linear because the lone pair electron causes the molecule to become bent.
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 7

Question 12

Which of the following molecules have a net dipole moment?
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 8
Select one or more:
 Correct
 Correct
 Correct
 Correct

Explanation

CHEM125 - CHAPTER 10 - BASIC HOMEWORK 9

Question 13

What is the orbital hybridization for the C atom in methane, CH4? For sp3d, you would write sp3d. Help: Valence bond theory

Explanation

CHEM125 - CHAPTER 10 - BASIC HOMEWORK 10
Tetrahedral
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 11

Question 14

Which statements are correct for the carbon dioxide molecule? Help: Hybrid orbital properties
Select one or more:
 Correct
 Correct
 Correct
 Correct

Explanation

CHEM125 - CHAPTER 10 - BASIC HOMEWORK 11
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 13

Question 15

Draw the Lewis formula for the SF4 molecule. Which statements are correct for this molecule?
Select one or more:
 Correct
 Correct
 Correct

Explanation

CHEM125 - CHAPTER 10 - BASIC HOMEWORK 11
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 15

Question 16

Complete the Lewis structure for the following hydrocarbon. Which statements are correct for this compound?
CHEM125 - CHAPTER 10 - BASIC HOMEWORK 16
Select one or more:
 Correct
 Correct
 Correct
 Correct
 Correct
 Correct