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Portage Learning Chem 210 Module 2 Exam

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  • CHEM 210
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  • Portage Learning

Portage Learning Chem 210 Module 2 Exam Question 1 3 / 3 pts The pH of a solution of 0.0010 M NaOH is: 1 Correct! 11 [Kw=[H+][OH-] = 1.0 x 10-14; [H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11; pH=-log[1.0 x 10-11;]=11] 8 0 14 Question 2 3 / 3 pts Water is a unique molec...

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  • February 1, 2023
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  • 2022/2023
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  • portage learning chem 210 module 2 exam question 1 3 3 pts the ph of a solution of 00010 m naoh is 1 correct 11 kwhoh 10 x 10 14 h00010 10 x 10 14 h10 x 10 11 ph l

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Portage Learning Chem 210 Module 2 Exam
Question 1
pts

The pH of a solution of 0.0010 M NaOH is:


1
Correct!

11

[Kw=[H+][OH-] = 1.0 x 10-14; [H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11;

pH=-log[1.0 x 10-11;]=11]


8

0

14

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
Correct!

All of the answers are correct

Question 3
pts

The bent shape of water is due to .




The dipole arrows in a water molecule

The electronegativity difference between hydrogen and oxygen

,You Answered

The unequal electron sharing between hydrogen and oxygen
Correct Answer

The unshared electron pairs on the oxygen atom

None of the answers are correct


Question 4
pts

Which diagrams correctly represent a hydrogen bond?




Correct Answer

A and D

A and C
You Answered

B and C

C and D

B and D

Question 5
pts
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?

-1.20

1.20
You Answered

, 3.12

-2.92
Correct Answer

2.92

Question 6
pts
If the Ka of an acid is 5.63 x 10-3, what is the pKa?

6.86
Correct!

2.25
[pKa = -log(5.63 x 10-3) = 2.25]

5.63

10.12

1.38

Question 7
pts

List the acids in DECREASING order of strength (strongest to weakest):

Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5); phosphoric acid (Ka = 7.3 x 10-3)


Nitrous acid, acetic acid, phosphoric acid

Acetic acid, nitrous acid, phosphoric acid
Correct!

Phosphoric acid, nitrous acid, acetic acid

Acetic acid, phosphoric acid, nitrous acid

None of the above

Question 8
pts

Elemental iodine (I2) is a solid at room temperature. What is the dominant attractive force that
exists between I2 molecules in the solid?

Correct Answer

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