Weighted Average Atomic Mass

Considering the different percent abundances of these cars, would you expect the average mass to be nearer to 4,000 lb or to 5,000 lb?

• 4000 lb

• 5000 lb

To write a percent as a decimal move the decimal...

• two places to the left

• two places to the right

• three places to the left

• three places to the right

What is 54.18% written as a decimal?

• 0.5418

• 5.418

• 54.18

• 541.8

• 5418

What is 3.348% written as a decimal?

• 0.0003348

• 0.03348

• 3.348

• 33.48

What is 61.28% written as a decimal?

• 0.06128

• .006128

• 0.6128

• 61.28

The weighted average is closer to the car with the 

• greater percent abundance

• lesser percent abundance

These two versions in copper will have the same number of...

• protons

• neutrons

Tags

NGSS.MS-PS1-1

These two versions in copper will have differing numbers of...

• protons

• neutrons

Who is more abundant? Copper-63 or Copper-65

• Copper-63

• Copper-65

Will the average atomic mass (the weighted average) be closer to 63 or 65?

• 63

• 65

• Neither, the average will be exactly in the middle at 64.