Chemical Reactions: Types and Balancing

What is the Law of Conservation of Mass?

• It states that no matter can be created or destroyed.
• It states that no energy can be created or destroyed.
• It states that matter can be created or destroyed.
• It states that no sound can be created or destroyed.

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

A + B → AB : is the general form for which reaction type?

• Double Replacement
• Synthesis
• Combustion
• Decomposition

Which of the following is an example of synthesis?

• 2Na + Br₂ --> 2NaBr
• 2KClO₃ --> 2KCl + 3O₂
• 2HgO + Cl₂-->2HgCl + O₂
• Cl₂ + 2NaBr --> 2NaCl + Br₂

Identify the type of reaction:  
Ca + O --> CaO

• Decomposition
• Synthesis
• Double Replacement
• Combustion

Identify this type of reaction,
Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

Which chemical reaction forms Carbon Dioxide and Water?

• Double Replacement
• Single Replacement
• Combustion
• Decomposition

Which chemical reaction breaks down into 2 substances?

• Double Replacement
• Single Replacement
• Synthesis
• Decomposition

Which reaction type is the following: 2AgF + CaCl₂ --> 2AgCl + CaF₂

• Decomposition
• Single Replacement
• Synthesis
• Double Replacement

Which reaction type is the following:  2Na + CaF₂ --> Ca + 2NaF

• Decomposition
• Single Replacement
• Synthesis
• Double Replacement