Regents Chemistry Test Preparation Practice

    Electrolyte

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    Base your answers to questions 10 on the information below and on your knowledge of chemistry.

    The electrical conductivity of three aqueous solutions was tested at room temperature. A 0.1 M HCl(aq) solution conducted, but a 6.0 M HCl(aq) solution was a better conductor. A 0.1 M C6H12O6(aq) solution was also tested. During this laboratory activity, appropriate safety equipment was used and safety procedures were followed.

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    Base your answers to questions 11 on the information below and on your knowledge of chemistry.

    In a laboratory investigation, an HCl(aq) solution with a pH value of 2 is used to determine the molarity of a KOH(aq) solution. A 7.5-milliliter sample of the KOH(aq) is exactly neutralized by 15.0 milliliters of the 0.010 M HCl(aq). During this laboratory activity, appropriate safety equipment is used and safety procedures are followed.

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

    The electrolysis of brine, a concentrated aqueous sodium chloride solution, produces three important industrial chemicals: chlorine gas, hydrogen gas, and sodium hydroxide. The diagram and equation below represent a brine electrolysis cell. Before the battery is connected, the pH value of the brine solution is 7.0.

    electrolytic-cell fig: chem82017-exam_g22.png

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

    Vinegar is a commercial form of acetic acid, HC2H3O2(aq). One sample of vinegar has a pH value of 2.4.

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

    In an investigation, aqueous solutions are prepared by completely dissolving a different amount of NaCl(s) in each of four beakers containing 100.00 grams of H2O(ℓ) at room temperature. Each solution is heated and the temperature at which boiling occurred is measured. The data are recorded in the table below.

    solutions fig: chem82016-exam_g16.png

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

    A laboratory technician is given the table below and a sample of one of the three substances listed in the table. The technician makes an aqueous solution with a portion of the sample. When a conductivity tester is lowered into the solution, the lightbulb on the tester glows brightly. Another portion of the sample is placed in a heat-resistant container that is placed in an oven at 450.°C. The sample melts.

    differentiation-of-types-of-substances fig: chem12016-exam_g9.png

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