Regents Chemistry Test Preparation Practice

    Electrochemical Cell

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    Base your answers to questions 11 on the information below.

    The diagram below represents an operating electrolytic cell used to plate silver onto a nickel key. As the cell operates, oxidation occurs at the silver electrode and the mass of the silver electrode decreases.

    oxidation-reduction, electrochemical-cell, voltaic-cell fig: chem12012-exam_g16.png

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    Base your answers to questions 12 on the information below and on your knowledge of chemistry.

    A student constructs an electrochemical cell. A diagram of the operating cell and the unbalanced ionic equation representing the reaction occurring in the cell are shown below.

    The blue color of the solution in the copper half-cell indicates the presence of Cu2+ ions. The student observes that the blue color becomes less intense as the cell operates.

    oxidation-reduction, electrochemical-cell, voltaic-cell, oxidation-reduction, electrochemical-cell, voltaic-cell fig: chem12019-exam_g14.png

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    Base your answers to questions 13 on the information below and on your knowledge of chemistry.

    An operating voltaic cell has magnesium and silver electrodes. The cell and the ionic equation representing the reaction that occurs in the cell are shown below.

    oxidation-reduction, electrochemical-cell, voltaic-cell, oxidation-reduction, oxidation-reduction-(redox)-reaction fig: chem62019-exam_g17.png

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    Base your answers to questions 14 on the information below and on your knowledge of chemistry.

    Electroplating is an electrolytic process that can be used to coat metal objects with a less reactive metal. The diagram below shows an electroplating cell that includes a power source connected to a copper rod and a bracelet made from a different metal. The rod and bracelet are in an aqueous copper(II) sulfate solution.

    oxidation-reduction, electrochemical-cell, voltaic-cell, oxidation-reduction, oxidation-reduction-(redox)-reaction fig: chem82023-exam_g22.png

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    Base your answers to questions 15 on the information below and on your knowledge of chemistry.

    A student made a copper bracelet by hammering a small copper bar into the desired shape. The bracelet has a mass of 30.1 grams and was at a temperature of 21°C in the classroom. After the student wore the bracelet, the bracelet reached a temperature of 33°C. Later, the student removed the bracelet and placed it on a desk at home, where it cooled from 33°C to 19°C. The specific heat capacity of copper is 0.385 J/g•K.

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