FGHS AP Chemistry Quiz #11 Unit #03 Exam Review Chemical Rxns

In the ion, HAsO4^2-, what is the oxidation number of arsenic?

• -2

• +4

• +5

• -5

When the half-reactions shown below are combined, what is true of the resulting REDOX reaction?

Zn ⇌ Zn²⁺ + 2e^-

Cu²⁺ + 2e^- ⇌ Cu

• Four electrons are transfered in the reaction

• Zinc metal is reduced

• Zinc ions are reduced

• Copper ions are reduced

In the reaction between thiosulfate ions (S₂O₃^2-) and iodine, the sulfur species is converted to S₄O₆^2- and the iodine is converted to iodide ions. Which statement regarding the reaction is true?

• The oxidation number of sulfur is the same in the reactants and products

• I atoms are oxidized

• The oxidation number of iodine changes from 0 to -1

• The reaction is not a REDOX reaction

In which of the following does the metal have the same oxidation state?

• MnO4^-1 and MnO2

• MnO4^-1 and MnO4^2-

• [Fe(CN)6]4^-1 and [Fe(NO3)4]^-1

• CrO4^-2 and Cr2O7^-2

When manganate(VII) ions are reduced to Mn²⁺ ions in acid solution, how many electrons are transferred?

• One cannot know without the corresponding oxidation half-reaction

• 2

• 5

• 7

When iron metal is added to a solution of copper(II) sulfate, which statement is true?

• A REDOX reaction takes place

• The copper ions are oxidized

• The copper ions are spectators

• Sulfate ions precipitate out

Which of the following reactions could be described as displacement?

• Sodium + Chlorine → Sodium chloride

• Hydrogen peroxide → Hydrogen + Oxygen

• The disproportionation of ClO3- to give hypochlorite ions and chloride ions

• Zinc + Sulfuric acid → Zinc sulfate + Hydrogen

In the following reaction, which species is acting as an acid in the REVERSE (right to left) reaction?

NH₃ + H₂O ⇌ NH₄⁺ + OH^-

• NH₃

• H₂O

• NH₄⁺

• OH^-

How many moles of hydroxide ions are present, and on which side of the equation, when the half-reaction below is balanced in BASIC solution, using the smallest possible integers?

MnO₄^- → MnO₂

• 2 on the reactant side

• 2 on the product side

• 4 on the reactant side

• 4 on the product side

Which of the following reactions represents both an Acid-Base neutralization, AND a precipitation reaction?

• Hydrochloric acid + Sodium hydroxide

• Lead(II) nitrate + Sodium chloride

• Sulfuric acid + Barium hydroxide

• Sulfuric acid + Potassium hydroxide