Balancing Equations

What is a coefficient?

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

Tags

NGSS.MS-PS1-5

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

• Coefficient 
• Subscript
• Atom
• Equation

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

• Yes
• No

Tags

NGSS.MS-PS1-5

Which problem is balanced?

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

Tags

NGSS.MS-PS1-5

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.MS-PS1-5

Select all the Reactants

• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Select all the Products

• 
• 
• 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Label the reactants and products:

a

b

Products

Reactants

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Which of the following is a balanced chemical equation?

Tags

NGSS.MS-PS1-5

• The number of molecules is not the same on both sides.

• The mass of reactants does not equal the mass of products.

• The number of atoms of each element is not the same on both sides.

• The equation is not balanced.

Tags

NGSS.MS-PS1-5