Balancing Equations

Which side of a chemical equation is the reactant side?

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which side of a chemical equation os the product side?

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

Tags

NGSS.MS-PS1-5

Which problem is balanced?

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

A replacement occurs when...

• Two formulas combine.
• A formula breaks apart.
• An atom is replaced during a reaction.

Decomposition occurs when...

• Two formulas combine.
• A formula breaks apart.
• An atom is replaced during a reaction.

Tags

NGSS.MS-PS1-5

A synthesis occurs when...

• Two formulas combine.
• A formula breaks apart.
• An atom is replaced during a reaction.

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes
• No

Tags

NGSS.MS-PS1-5

How would this equation be classified?
O₂ + 2H₂ --> 2H₂O 

• Synthesis
• Decomposition
• Combustion
• Single Displacement

Balance this equation:
MgCl₂ --> Mg₄+ Cl₂

• It's already balanced.
• 4MgCl₂ --> Mg₄+ 4Cl₂
• 4MgCl₂ --> Mg₄+ 5Cl₂

Tags

NGSS.MS-PS1-5