Balancing Equations & Types of Reactions PRACTICE

Choose the answer that balances this equation.

H_{2 +} O_{2 -->} H₂O

• 2H_{2 +} O_{2 -->} 2H₂O

• 2H_{2 +} 2O_{2 -->} H₂O

• H_{2 +} 2 O_{2 -->} 2H₂O

• balanced already

Tags

NGSS.HS-PS1-7

The Law of Conservation of Mass says:

• Matter can be destroyed, but it can't be created.

• Matter can be created with any density as long as the volume remains constant.

• Matter cannot be created nor destroyed.

• Matter can change phases and still be the same substance.

Tags

NGSS.HS-PS1-7

If I have 100 grams of reactants, how many grams of products should I have?

• 0g

• 100g

• 50g

• 75g

Tags

NGSS.HS-PS1-7

Choose the answer that shows this equation balanced:

C + S₈ ----->CS₂

• 4C + S₈ ----->4CS₂

• 3C + S₈ -----> 2CS₂

• C + 2S₈ -----> 6CS₂

• 8C + S₈ -----> 4CS₂

Tags

NGSS.HS-PS1-7

How many Mn atoms are found in the following compound?
3Cr(MnO₄)₆

• 3
• 4
• 6
• 18

What are the larger numbers that you CAN CHANGE in a chemical equation? 

• Coefficient 
• Products
• Reactants
• Subscripts

Tags

NGSS.HS-PS1-7

Which problem is balanced?

• PbO₂ + 2H₂
• SO₂ + H₂0 --> H₂SO₄
• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.HS-PS1-7

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.HS-PS1-7

PCl₅  +  ___ H₂O  →  ___ HCl  +   H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Tags

NGSS.HS-PS1-2

___ Cr + ___O₂ -----> ____ Cr₂O₃

• 3, 2, 4

• 2, 3, 4

• 2,1, 5

• 4, 3, 2