Chapter 9 Review (CP)

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

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

What is a coefficient?

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

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 right side of the equation below is called the

• products
• reactants

Which of the following could indicate a chemical change? 

• All of the answers could indicate Chemical Change 
• a color change has occurred 
• bubbles appear 
• identifying one or more new chemical products 

Evidence of a chemical reaction include:

• Phase change
• No new substance
• Bubbles forming
• Shape change

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

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

What type of chemical reaction is this one?
CUO + CO2 --> CuCO3

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

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

• Decomposition
• Combustion
• Synthesis
• Single Replacement 

2Ca + O₂ > 2CaO 

What is the 2 located behind oxygen (O) called?

• coefficient
• reactant
• subscript
• product