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AP Chemistry Electrochemistry — practice questions

Explore 20 free Electrochemistry questions in AP Chemistry Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Electrochemistry questions and exercises with answers

Showing questions 1–20 of 20.

A cell in which a spontaneous redox reaction takes place is called a:Read the answer and worked solution →In a galvanic cell, electron transfer between the reactants happens:Read the answer and worked solution →An electrode made from a member of the half-cell's own redox couple is called:Read the answer and worked solution →The instrument used to measure the potential difference between two half-cells is a:Read the answer and worked solution →Electrical current is measured in amperes, where one ampere is:Read the answer and worked solution →Larger dry cells of the same chemistry give the same voltage but can transfer:Read the answer and worked solution →An alkaline battery delivers roughly how much more energy than a similar-sized zinc-carbon cell?Read the answer and worked solution →A lead acid car battery reaches 12 volts because it connects in series:Read the answer and worked solution →Compared with an internal combustion engine, a fuel cell using the same reaction is typically:Read the answer and worked solution →The blue-green patina on outdoor copper structures forms because copper oxides react with:Read the answer and worked solution →A protective oxide layer that stops further corrosion is formed by a process called:Read the answer and worked solution →Rust differs from copper patina in that the rust layer:Read the answer and worked solution →A sacrificial anode protects iron because the anode metal has a reduction potential that is:Read the answer and worked solution →To drive a nonspontaneous cell reaction, the applied voltage must be:Read the answer and worked solution →Reducing chromium(III) to chromium metal requires how many moles of electrons per mole of chromium?Read the answer and worked solution →Match each cell term to its meaningRead the answer and worked solution →Which delivers more?Read the answer and worked solution →True or false: electrochemistryRead the answer and worked solution →Sort each item by its batteryRead the answer and worked solution →Complete the corrosion storyRead the answer and worked solution →

Worked practice questions

A cell in which a spontaneous redox reaction takes place is called a:

  1. Galvanic cell
  2. Electrolytic cell
  3. Concentration cell
  4. Photovoltaic cell
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Correct answer: A. Galvanic cell

1. Devices that separate a redox reaction into two half-cells are electrochemical cells. 2. They divide into two families by whether the reaction runs on its own. 3. Those in which a spontaneous redox reaction takes place are called galvanic cells, or voltaic cells. 4. An electrolytic cell has to be driven by an applied voltage instead. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 17 'Electrochemistry', sections 17.1-17.7_

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In a galvanic cell, electron transfer between the reactants happens:

  1. Through the atmosphere
  2. Through an external circuit
  3. By direct contact only
  4. Across a vacuum gap
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Correct answer: B. Through an external circuit

1. The two reactants are deliberately kept apart in separate half-cells. 2. Direct transfer of electrons is therefore prevented. 3. Transfer instead takes place indirectly through an external circuit that contacts the separated reactants. 4. Routing the electrons through a wire is what lets the cell do useful electrical work. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 17 'Electrochemistry', sections 17.1-17.7_

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An electrode made from a member of the half-cell's own redox couple is called:

  1. A salt bridge
  2. A voltmeter probe
  3. An active electrode
  4. An inert electrode
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Correct answer: C. An active electrode

1. Sometimes the electrode is just a conductor and sometimes it takes part in the chemistry. 2. An inert electrode is needed when neither member of the redox couple can reasonably function as an electrode. 3. Electrodes constructed from a member of the redox couple, such as a magnesium anode, are called active electrodes. 4. The electrode must be electrically conductive and in a phase separate from the half-cell solution. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 17 'Electrochemistry', sections 17.1-17.7_

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More Chemistry topics

Composition of Substances and SolutionsEquilibria of Other Reaction ClassesSolutions and ColloidsStoichiometry of Chemical ReactionsThermodynamicsAcid-Base EquilibriaAtoms, Molecules, and IonsChemical Bonding and Molecular Geometry