Balancing chemical equations

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. 

What is the left part of a chemical equation called?
2H₂ + O₂ --> 2H₂O

• Reactants

• Products

• Yields

• Chemical Equation

What is the right part of a chemical equation called?
2H₂ + O₂ --> 2H₂O

• Reactants

• Products

• Yields

• Chemical Equation

What is the total number of atoms present in 5Na₃PO₄?

• 5

• 40

• 55

• 8

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

• 3
• 4
• 6
• 18

What is the little number after an element in a chemical equation called?
Example: H₂

• Coefficient 

• Subscript

• Atom

• Equation

Is the following equation balanced?
Al + O₂ --> Al₂O₃

• Yes!

• No!

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

Element or compound?
H₂O

• Element
• Compound

Element or compound?
O₂

• Element

• Compound