Counting Atoms and Chemical Equations

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes

• No

Tags

NGSS.MS-PS1-5

How many Oxygen are in H₂O?

• 1

• 2

• 0

• 4

Tags

NGSS.MS-PS1-1

How many elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The red numbers in the image below represent ________

• subscripts

• coefficients

• I don't know, and don't want to try

• None of the answers are correct

The blue numbers in the image below represent ________

• I don't know, and don't want to try

• coefficients

• subscripts

• none of the answers are correct

What would be the formula for ethane?

• CH₄

• CH₆

• C₂H₂

• C₂H₆

Tags

NGSS.MS-PS1-1

How many atoms of Hydrogen are in this compound

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Oxygen atoms are in Al₂(SO₄)₃

• 4

• 12

• 7

• 24

Tags

NGSS.MS-PS1-1

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄

• HSO₄

• H₄S₃O

• H₂O

Tags

NGSS.MS-PS1-1

How many total atoms are in this compound?
H₂C₃O₄N₅

• 5

• 14

• 15

• 19

Tags

NGSS.MS-PS1-1