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Unit 9 Review

Authored by Conor Smith

Chemistry, Science

9th - 12th Grade

Used 6+ times

Unit 9 Review
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16 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If you have a beaker with 50 mL of 3M CaO solution, would the number of moles of solute change if you added water to the 70mL mark? 

Yes, the number of moles of solute will increase because the total solution volume is increasing. 

No, the number of moles of solute would not increase but the concentration of the solution would increase.

Yes, the number of moles of solute will increase because the volume of water is increasing. 

No, the number of moles of solute would not increase because the volume of water has no effect on the number of moles of solute. 

Answer explanation

Remember, concentration is moles/liters. If you add liters of volume, you do not change the moles of solute, but you do decrease the concentration by "watering it down"

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How many moles of KCl are needed to prepare 7.0 L of a 2.0 M solution? 

0.67 moles

1.14 moles

10.0 moles

14.0 moles

Answer explanation

Since molarity is moles/volume, you can rewrite it to say moles = molarity * volume.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Of four different experiments, which of the following pH levels has the highest acidity?

1

3

5

6

Answer explanation

Acids have a pH of 1-6 and the lower the pH, the stronger the acidity.

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The pOH of a solution is 8.7, calculate the pH 

8.7

5.3

5.7

8.3

Answer explanation

pH and pOH add up to 14, so to find one of them, take 14 and subtract from the pH/pOH you DO have.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

9.3

7.6

11.4

Answer explanation

The formula for pH is:

-log[H], where [H] is the concentration of Hydrogen.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The pH of bleach is approximately 12.7.  Which of the following best describes bleach? 

Strong Acid

Strong Base

Weak Acid

Weak Base

Answer explanation

Bases are pH of 8-14 and the higher the number, the more basic it is.

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What best describes the solvent in a solution? 

The substance that absorbs energy

The substance that releases gas.

The substance that dissolves

The substance that gets dissolved

Answer explanation

Solvent is the substance that does the dissolving

Solute is the substance that is dissolved.

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