Chemical Reactions Review

According to the Law of Conservation of Mass,

• matter is always created in a chemical reaction

• matter is always destroyed in a chemical reaction

• matter is created and then destroyed in a chemical reaction

• matter is not created or destroyed in a chemical reaction

Examine the following chemical reaction: H20 + CO2 → C6H12O6 + O2 What are the reactants?

• H20 + CO2

• →

• C6H12O6 + O2

• H20 + CO2 → C6H12O6 + O2

Examine the following chemical reaction: H20 + CO2 → C6H12O6 + O2 What are the products?

• H20 + CO2

• →

• C6H12O6 + O2

• H20 + CO2 → C6H12O6 + O2

Examine the following chemical reaction: H2O2 → H2O + O2 What are the products?

• H2O2

• →

• H2O + O2

• H2O2 → H2O + O2

Examine the following chemical reaction: H2O2 → H2O + O2 What are the reactants?

• H2O2

• →

• H2O + O2

• H2O2 → H2O + O2

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction

• Compound

• Coefficient

• Subscript

• Chemical Formula

A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.

• Compound

• Coefficient

• Subscript

• Chemical Formula

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

• 3
• 4
• 6
• 18

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4