Calculating Atomic Mass and Isotopes

Calculating Atomic Mass and Isotopes

Assessment

Interactive Video

Created by

Ethan Morris

Chemistry

6th - 10th Grade

4 plays

Easy

The video tutorial explains atomic mass, emphasizing its significance for elements. It introduces the concept of weighted averages, contrasting it with regular averages, and uses a car analogy to illustrate the idea. The tutorial then details how to calculate weighted averages, applying this knowledge to isotopes of elements like Copper. The video concludes by explaining how these calculations relate to the atomic mass values found on the periodic table.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is atomic mass?

The number of neutrons in an element

The number of protons in an element

The number of electrons in an element

An average of the masses of different atoms

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a weighted average?

An average that considers the frequency of each value

An average that is always in the middle of the values

An average that only considers the highest value

An average that ignores the frequency of each value

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the analogy, what feature distinguishes the Lemona GX from the Lemona GXL?

Color and luxury features

Engine size

Fuel efficiency

Number of doors

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you calculate the regular average weight of the Lemona GX and GXL?

Subtract the weights and divide by the number of models

Multiply the weights and divide by the number of models

Add the weights and divide by the number of models

Add the weights and multiply by the number of models

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What percentage of Lemonas are GX models?

95%

50%

5%

100%

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the weighted average weight of the Lemona cars?

4,000 pounds

4,500 pounds

4,050 pounds

5,000 pounds

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are isotopes?

Atoms with the same number of neutrons but different numbers of protons

Atoms with different numbers of protons and neutrons

Atoms with different numbers of electrons

Atoms with the same number of protons but different numbers of neutrons

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the mass of Copper 63?

62.93 amu

64 amu

63 amu

65 amu

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent abundance of Copper 63?

50%

69%

100%

31%

10.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the calculated atomic mass of Copper using weighted averages?

62.93 amu

63.62 amu

64 amu

65 amu

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