Chemical Reactions and Counting Atoms

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃

•  P₄+ O₂ --> 2 P₂O₃

•  P₄+ 3 O₂ --> 2 P₂O₃

•  P₄+ 2 O₂ --> 3 P₂O₃

Tags

NGSS.MS-PS1-5

Is this equation balanced?

• yes

• no

• Not enough information

• Left side is balanced

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 atoms are there TOTAL in:
H₂SO₄

• 6

• 5

• 7

• 3

Tags

NGSS.MS-PS1-1

How many Sodium (Na) are in 6NaCl?

• 1

• 12

• 6

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 atoms of Hydrogen are in this compound

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The law of conservation of matter states that

• chemical reactions change matter.

• in chemical reactions, the identity of reactants and products is conserved.

• atoms are neither created nor destroyed in chemical reactions.

• a chemical equation must be balanced.

Tags

NGSS.MS-PS1-5

Number of C's in 2Na₂CO₃

• 1

• 2

• 3

• 5

Tags

NGSS.MS-PS1-1

How many Aluminum are in Al₂O₃?

• 3

• 2

• 5

Tags

NGSS.MS-PS1-1