Understanding Chemical Reactions

What is a combination reaction?

• A combination reaction is when a single substance breaks down into two or more products.

• A combination reaction involves the exchange of ions between two compounds.

• A combination reaction is a process where substances are mixed without any chemical change.

• A combination reaction is a chemical reaction where two or more substances combine to form a single product.

Write the general formula for combination reactions.

• A + B → AB

• A + B → A - B

• A + B → A2B

• A + B → A

Give an example of a combination reaction involving calcium oxide.

• CaO + H2O → Ca(OH)2

• CaO + CO2 → CaCO3

• CaO + NaCl → CaCl2 + Na2O

• CaO + H2 → Ca + H2O

What happens in a decomposition reaction?

• A single compound combines with another compound.

• A single compound breaks down into simpler substances.

• A compound is formed from two or more elements.

• A compound undergoes a chemical reaction without changing its structure.

What is the general formula for decomposition reactions?

• A + B → AB

• AB → A + B

• A + B → AB + C

• AB + C → A + B

Name a type of decomposition that requires heat.

• Chemical decomposition

• Thermal decomposition

• Mechanical decomposition

• Biological decomposition

Provide an example of thermal decomposition.

• Calcium carbonate decomposing into calcium oxide and carbon dioxide.

• Water boiling into steam.

• Sugar dissolving in water.

• Iron rusting in the presence of oxygen.

What is electrolytic decomposition?

• Electrolytic decomposition is a method of heating substances to high temperatures.

• Electrolytic decomposition refers to the mixing of different chemicals without electricity.

• Electrolytic decomposition is the process of solidifying a liquid into a solid state.

• Electrolytic decomposition is the breakdown of a substance into its components using electric current.

Give an example of a electrolytic decomposition reaction.

• NaCl (s) -> Na (s) + Cl2 (g)

• 2 H2O2 (l) -> 2 H2O (l) + O2 (g)

• 2 H2O (l) -> H2 (g) + O2 (g)

• CaCO3 (s) -> CaO (s) + CO2 (g)

What is the product of the reaction 2H₂ + O₂?

• 2H₂O

• H₂O₂

• O₃

• H₂O₂ + H₂O