Atomic Structure and Caloric Content

The video tutorial covers several topics: drawing an atom with protons, neutrons, and electrons; understanding valence electrons and the difference between covalent and ionic bonds; calculating the half-life of iodine to determine the age of bones; and calculating the percentage of calories from fat in muffins, comparing it to recommended dietary guidelines.

What is the atomic number of an element with 5 protons?

• 20

• 15

• 10

• 5

How many valence electrons does an atom with 2 inner shell electrons and 3 outer shell electrons have?

• 2

• 3

• 5

• 8

Which type of bond involves the sharing of electrons?

• Metallic

• Covalent

• Ionic

• Hydrogen

Why is it difficult for boron to form ionic bonds?

• It has too many protons.

• It is a noble gas.

• It needs to gain or lose too many electrons.

• It has a full outer shell.

If a sample originally had 80 grams of iodine and now has 20 grams, how many half-lives have passed?

• 1

• 2

• 3

• 4

How old is a sample if it has gone through two half-lives, each lasting 8 days?

• 8 days

• 16 days

• 24 days

• 32 days

How many calories are in 24 grams of fat?

• 288

• 96

• 216

• 144

What is the total calorie count for two muffins if each contains 250 calories?

• 250

• 500

• 1000

• 750

What percentage of calories from two muffins comes from fat if the total is 504 calories and 216 are from fat?

• 60%

• 50%

• 30%

• 42.9%

Is 42.9% of calories from fat higher or lower than the recommended maximum of 30%?

• Lower

• Higher

• Equal

• Not applicable