Chemical Formulas and Counting Atoms

Which statement is true about the following compounds?

• Compound 1 contains 6 more Oxygen atoms than Compound 2

• Compound 2 contains twice the amount of total atoms as Compound 3

• Compound 1 contains twice the amount of total atoms as Compound 2

• Compound 1 contains 30 total atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many total atoms do you have for each element in this chemical formula?

• P = 2, O = 4, H = 8

• P = 1, O = 3, H = 2

• P = 2, O = 3, H = 8

• P = 2, O = 4, H = 3

Tags

NGSS.MS-PS1-1

Which of these substances have the same number of hydrogen atoms?

• H₅C₆PO₄

• C₆H₁₂O₆

• CH₄COOH

• CH₃CH₇

Tags

NGSS.MS-PS1-1

How many total atoms are in the compound for ammonia, NH₃

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are in this chemical formula:

• 4 hydrogen atoms

• 1 hydrogen atom

• 2 hydrogen atoms

• 3 hydrogen atoms

Tags

NGSS.MS-PS1-1

How many total atoms are in the compound 2H₂O?

• 2

• 3

• 4

• 6

Tags

NGSS.MS-PS1-1

How many oxygen atoms are in this chemical formula?

• 6 oxygen atoms

• 2 oxygen atoms

• 3 oxygen atoms

• 4 oxygen atoms

Answer explanation

Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!

Tags

formulas

How many oxygen atoms are in this chemical formula?

• 7 oxygen atoms

• 4 oxygen atoms

• 3 oxygen atoms

• 1 oxygen atom

Tags

NGSS.MS-PS1-1

Count the atoms

• 2

• 6

• 15

• 8

• 4

Tags

NGSS.MS-PS1-1

Count the atoms

• 2

• 6

• 15

• 8

• 4

Tags

NGSS.MS-PS1-1