BioChem 210 Module 2 Exam - Portage Learning

BioChem 210 Module 2 Exam - Portage Learning

Question 1
Scientific Calculator
The pH of a solution of 8.9 x 10-12 M NaOH is:
A. 8.9
B. 8.9 x 10-12
C. 4.8
D. 11
E. 2.9
A
B
C
 BioChem 210 Module 2 Exam - Portage Learning
D
Correct!
E
[Kw=[H+][OH-] = 1.0 x 10-14; [H+][8.9 x 10-12] = 1.0 x 10-14 ;[H+]=890;
pH=-log[890]=2.9]
Question 2
Which attribute contributes to water’s unusual properties?
The geometry of the molecule
The polarity of the O-H bonds
The ability of water molecules to hydrogen bond
The bond angle of water
Correct!
All of the answers are correct
Question 3
What factor contributes to the bent shape of a water molecule?
The dipole arrows in a water molecule
Correct!
The unshared electron pairs on the oxygen atom
The electronegativity difference between hydrogen and oxygen
The unequal electron sharing between hydrogen and oxygen
None of the answers are correct
Question 4
Which diagrams correctly represent a hydrogen bond?