Balancing and Types of Reactions

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

What type of chemical reaction is this one?
Al(OH)₃ --> Al2O3  + H2O

• Decomposition

• Double Replacement

• Synthesis

• Single Replacement 

What type of chemical reaction is this one? CuCl + CO2 --> Cu2O3 + CCl4

• Decomposition

• Double Replacement

• Synthesis

• Single Replacement 

What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg

• Decomposition

• Double Replacement

• Synthesis

• Single Replacement 

What is a coefficient?

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

What coefficients are needed to correctly balance the equation?
_Bi   +   _O₂   >   _Bi₂O₃

• 3,2,3
• 2,3,2
• 4,3,2
• none of these

Why must chemical equations be balanced?

• So that the equation doesn't explode

• The reaction won't happen until it is balanced

• Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

• Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e

The left side of the equation below is called

• Products
• Reactants

The right side of the equation below is called the

• products
• reactants

What type of reaction is illustrated below?
2HI --> H₂  +  I₂

• synthesis
• decomposition
• single replacement
• double replacement