Counting Atoms and Chemical Equations

Is this equation balanced?

• yes

• no

• Not enough information

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Hydrogen are in 4H₂O?

• 6

• 8

• 2

• 4

Tags

NGSS.MS-PS1-1

How many Magnesium are in 10MgCl₂?

• 10

• 5

• 20

Tags

NGSS.MS-PS1-1

2H₂ + O₂ ----> 2H₂O What is the product?

• ------>

• 2H₂O

• 2H₂+ O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Nitrogen (N) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

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

How many TOTAL ATOMS are in the chemical formula shown?

• 8

• 4

• 5

• 6

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 O's are in Al₂(SO₄)₃

• 4

• 12

• 7

• 24

Tags

NGSS.MS-PS1-1