Counting Atoms

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

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

How many total atoms are in the compound 2H₂O?

• 2

• 3

• 4

• 6

Tags

NGSS.MS-PS1-1

What is the total number of atoms present in 5Na₃PO₄?

• 5

• 55

• 40

• 8

Tags

NGSS.MS-PS1-1

How many O's are in Al₂(SO₄)₃

• 4

• 12

• 7

• 24

How many molecules are in this chemical formula?

• 5 molecules

• 4 molecules

• 2 molecules

• 6 molecules

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

2KNO_{3 How many nitrogen (N) atoms?}

• 1

• 2

• 6

Tags

NGSS.MS-PS1-1

How many TOTAL atoms are on the compound 2NH₃?

• 5

• 8

• 6

• 4

Tags

NGSS.MS-PS1-1

Count the atoms

• 2

• 6

• 15

• 8

• 4

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

• 3

• 4

• 12

• 16

Tags

DOK Level 2: Skill/Concept