Redox Reactions Review

What is the role of a reducing agent in a redox reaction?

• A reducing agent is a substance that donates electrons to another substance, causing the other substance to be reduced.

• A reducing agent is a substance that accepts electrons from another substance, causing the other substance to be oxidized.

• A reducing agent is a substance that increases the oxidation state of another substance.

• A reducing agent is a substance that does not participate in the reaction.

What is the oxidation number of hydrogen in most compounds?

• 0

• -1

• +1

• +2

What is the balanced equation for the reaction of MnO4- with I- in acidic solution?

• 8H+ + MnO4- + 5I- → Mn2+ + 4H2O + 5I2

• 2H+ + MnO4- + 3I- → Mn2+ + 2H2O + 3I2

• 4H+ + MnO4- + 2I- → Mn2+ + 2H2O + 2I2

• 6H+ + MnO4- + 4I- → Mn2+ + 3H2O + 4I2

What is the difference between a complete ionic equation and a net ionic equation?

• A complete ionic equation shows only the ions that participate in the reaction, while a net ionic equation shows all the ions present in a solution.

• A complete ionic equation shows all the ions present in a solution, while a net ionic equation shows only the ions that participate in the reaction.

• A complete ionic equation is used for solids, while a net ionic equation is used for liquids.

• A complete ionic equation includes only the reactants, while a net ionic equation includes both reactants and products.

What is the half-reaction method?

• A technique to balance redox reactions by separating oxidation and reduction processes into two half-reactions.

• A method for calculating the concentration of solutions in chemistry.

• A way to determine the molecular weight of compounds.

• A process for identifying the types of chemical bonds in a molecule.

How do you determine the oxidation state of an element in a compound?

• By using a set of rules, including the known oxidation states of other elements in the compound.

• By calculating the total charge of the compound and dividing by the number of elements.

• By identifying the element's position in the periodic table and its group number.

• By assuming all elements have a zero oxidation state unless otherwise specified.

How many electrons are transferred in the reaction of MnO4- with I-?

• 5 electrons are transferred in the reaction.

• 8 electrons are transferred in the reaction.

• 10 electrons are transferred in the reaction.

• 12 electrons are transferred in the reaction.

Define reduction in terms of electron transfer.

• Reduction is the process in which an atom, ion, or molecule loses electrons, resulting in an increase in oxidation state.

• Reduction is the process in which an atom, ion, or molecule gains electrons, resulting in a decrease in oxidation state.

• Reduction is the process of breaking down a compound into its elements.

• Reduction is the process of combining two or more elements to form a compound.

What is the oxidation number of oxygen in most compounds?

• -1

• 0

• -2

• +1

What is the oxidation state of sulfur in H2SO4?

• +4

• +2

• +6

• +8