Concentration and Molarity Concepts

Concentration and Molarity Concepts

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial covers the concepts of solution concentration, focusing on molarity and parts per million (ppm). It explains how to calculate molarity by determining the number of moles of solute per liter of solution, using examples with NaOH. The tutorial also describes ppm as a measure of solute mass in a million grams of solution, often used in pollution contexts, and provides calculation examples with KOH.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary focus of the concentration objectives discussed in the video?

To learn about chemical reactions.

To understand the periodic table.

To define and calculate molarity and parts per million.

To explore the history of chemistry.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is molarity defined in the context of solutions?

Grams of solute per liter of solution.

Moles of solute per liter of solution.

Liters of solute per mole of solution.

Grams of solute per mole of solution.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the example given, what is the molarity of a solution containing 4 moles of NaOH in 2 liters?

3 molar

2 molar

4 molar

1 molar

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a solution is 3 molar, how many moles of solute are present in 2 liters?

6 moles

5 moles

4 moles

3 moles

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does parts per million measure in a solution?

Moles of solute per million moles of solution.

Moles of solute per liter of solution.

Grams of solute per million grams of solution.

Liters of solute per million liters of solution.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the example, what is the concentration in parts per million if 0.02 grams of Na3PO4 is dissolved in 1004 grams of solution?

25 ppm

20 ppm

10 ppm

15 ppm

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many grams of KOH are present in a solution with 300 ppm concentration in 1004 grams of solution?

0.400 grams

0.100 grams

0.200 grams

0.300 grams

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