Question 1
pts
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
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
pts
Water is a unique molecule. Which of the following contributes to water’s unique place
,in the chemical world?
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
All of the answers are correct
ALL OF THE ANSWERS ARE CORRECT
What factor contributes to the bent shape of a water molecule?
The dipole arrows in a water molecule
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
THE UNSHARED ELECTRON PAIRS ON THE OXYGEN ATOM
Question 4
pts
Which diagrams correctly represent a hydrogen bond?
, A and B
A and D
B and C
C and D
A and C
A AND C
BOTH SHOW A PROTON DONOR AND ACCEPTOR
Question 5
pts
Scientific Calculator
The H+ concentration of a solution is 5.6 x 10-5 What is the pH?
-4.25
Correct!
4.25
[ [H+]=5.6 x 10-5; pH=-log[5.6 x 10-5]=4.25]
5.65
-9.75
9.75
4.25
[ [H+]=5.6 x 10-5; pH=-log[5.6 x 10-5]=4.25]
If the Ka of an acid is 2.67 x 10-5, what is the pKa?
7.45
pts
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
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
pts
Water is a unique molecule. Which of the following contributes to water’s unique place
,in the chemical world?
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
All of the answers are correct
ALL OF THE ANSWERS ARE CORRECT
What factor contributes to the bent shape of a water molecule?
The dipole arrows in a water molecule
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
THE UNSHARED ELECTRON PAIRS ON THE OXYGEN ATOM
Question 4
pts
Which diagrams correctly represent a hydrogen bond?
, A and B
A and D
B and C
C and D
A and C
A AND C
BOTH SHOW A PROTON DONOR AND ACCEPTOR
Question 5
pts
Scientific Calculator
The H+ concentration of a solution is 5.6 x 10-5 What is the pH?
-4.25
Correct!
4.25
[ [H+]=5.6 x 10-5; pH=-log[5.6 x 10-5]=4.25]
5.65
-9.75
9.75
4.25
[ [H+]=5.6 x 10-5; pH=-log[5.6 x 10-5]=4.25]
If the Ka of an acid is 2.67 x 10-5, what is the pKa?
7.45
