Balancing Chemical Equations - Practice

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.HS-PS1-7

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

• 3
• 4
• 6
• 18

Tags

NGSS.MS-PS1-1

__ P₄ + __ O₂ -----> ____P₂O₅

• 1, 5, 2

• 2, 5, 7

• 2, 1, 5

• 5, 1, 2

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

___ Al + ___ Br₂ -----> ____ AlBr₃

• 3, 2, 2

• 2, 3, 2

• 3, 2, 2

• 1, 2, 3

Tags

NGSS.HS-PS1-7

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

Tags

NGSS.MS-PS1-1

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Tags

NGSS.HS-PS1-7

PCl₅  +  ___ H₂O  →  ___ HCl  +   H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

__ Al  +  __ FeO  →  Al₂O₂  +  __ Fe

• 1, 1, 2
• 2,1,2
• 2, 2, 2
• 2,4,2

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

NGSS.HS-PS1-1

 Mg  +  ___ HCl  →   MgCl₂  +   H₂

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7

Which side of a chemical equation is the reactant side?

• Left (before the yields sign)
• Right (after the yields sign)

Tags

NGSS.MS-PS1-5