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Understanding Percentages and Concentration

Understanding Percentages and Concentration

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

This video tutorial explains the concept of 'parts per' measurements, including parts per hundred (percent), parts per million, and parts per billion. It begins with an introduction to percentages, detailing how 'percent' means per hundred. The video then transitions to parts per million, using a practical example involving mercury in a solution to demonstrate the calculation process. The tutorial concludes by summarizing the concepts and emphasizing that the same calculation method applies to parts per billion.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the term 'parts per' refer to in scientific measurements?

A type of currency

A method to measure time

A way to express concentration

A unit of weight

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Historically, how was the term 'percent' originally written?

As a number

As a single word

As two separate words

As a symbol

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If you receive a 3% discount on a $2 purchase, how much do you save?

3 cents

9 cents

12 cents

6 cents

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of dividing 6 by 100 in percentage calculations?

6

0.006

0.06

0.6

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the equivalent of 10 parts per million in a 100-gram solution?

1 gram

0.001 gram

0.1 gram

0.01 gram

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the context of parts per million, what does the term 'parts' refer to?

Units of concentration

Units of mass

Units of volume

Units of time

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you calculate the amount of a substance in parts per million?

Divide the ppm value by the total mass

Multiply the ppm value by the total mass and divide by a million

Divide the total mass by the ppm value

Multiply the total mass by the ppm value

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