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Balance this equation,            Al₂O₃ ---> Al + O₂ 

• Cannot be balanced
• 2Al₂O₃ ---> 2Al + 3O₂ 
• 2Al₂O₃ ---> 4Al + 3O₂ 
• 3Al₂O₃ ---> 2Al + O₂ 

Balance this equation:  H₂ + N₂ → NH₃

•  H₂ + 4N₂ → NH₃
•  H₂ + 3N₂ → 2NH₃
•  3H₂ + N₂ → 2NH₃
•  2H₂ + 2N₂ → 2NH₃

Substances that enter into a chemical reaction (found to the left side of the arrow) 

• product
• reactant
• chemical
• balanced equation

The large number in front of a chemical formula or compound is the ___________. 

• coefficient
• product
• physical
• chemical

In every balanced chemical equation, each side of the equation has the same number of ____.  

• coefficients
• moles
• molecules
• atoms of each element

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced
• unbalanced

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products
• reactants
• yield
• chemical formula

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Which two processes could be considered opposites?

• decomposition and double replacement

• double replacement and substitution

• substitution and synthesis

• synthesis and decomposition

In a chemical reaction, a hydrocarbon compound reacts with the diatomic element oxygen. What type of reaction is this?

• single replacement

• combustion

• combination

• double replacement