Exam Review (Ch. 7-9)

What are the seven diatomic elements?

• H_2, Cl₂, Br₂, O₂, N₂, I₂, F₂

• H₂, Cl₂, I₂, F₂, Hg₂, Br₂, Fe₂

• H_2, Cu₂, Ni₂, B₂, O₂, I₂, Fe₂

NaHCO₃ is an example of —

• an abbreviation
• a compound
• a mixture
• an element

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

2H₂O + 2N → 4H + 2NO

The chemical symbols on the RIGHT (at the end of the equation) are called:

• products

• reactants

• yields/produces

In reactions, products must be equal to..

• Products

• Reactants

• Starters

• Enders

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. 

What type of chemical reaction has a general formula of:

AB + CD ----> CB + AD

• Synthesis

• Combustion

• Single Replacement

• Double Replacement

• Decomposition

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

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

What type of reaction is the equation C + O₂ → CO₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

What type of reaction is the equation 2NaCl →2Na +Cl₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction