Calculating Atomic Mass and Isotopes

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.

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

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

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

• Color and luxury features

• Engine size

• Fuel efficiency

• Number of doors

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

What percentage of Lemonas are GX models?

• 95%

• 50%

• 5%

• 100%

What is the weighted average weight of the Lemona cars?

• 4,000 pounds

• 4,500 pounds

• 4,050 pounds

• 5,000 pounds

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

What is the mass of Copper 63?

• 62.93 amu

• 64 amu

• 63 amu

• 65 amu

What is the percent abundance of Copper 63?

• 50%

• 69%

• 100%

• 31%

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

• 62.93 amu

• 63.62 amu

• 64 amu

• 65 amu