Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry August 2016

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    Base your answers to questions 53 and 54 on the information below and on your knowledge of chemistry.

    A beaker contains a liquid sample of a molecular substance. Both the beaker and the liquid are at 194 K. The graph below represents the relationship between temperature and time as the beaker and its contents are cooled for 12 minutes in a refrigerated chamber.

    heating-curves-calculation-of-heat fig: chem82016-exam_g12.png

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    Base your answers to questions 55 through 58 on the information below and on your knowledge of chemistry.

    The equation below represents a reaction between propene and hydrogen bromide.

    chemical-reactions-and-equations fig: chem82016-exam_g13.png

    Cyclopropane, an isomer of propene, has a boiling point of –33ºC at standard pressure and is represented by the formula below.

    chemical-reactions-and-equations fig: chem82016-exam_g14.png

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    Base your answers to questions 59 through 62 on the information below and on your knowledge of chemistry.

    The radius of a lithium atom is 130. picometers, and the radius of a fluorine atom is 60. picometers. The radius of a lithium ion, Li+, is 59 picometers, and the radius of a fluoride ion, F, is 133 picometers.

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    Base your answers to questions 63 and 64 on the information below and on your knowledge of chemistry.

    Nuclear fission reactions can produce different radioisotopes. One of these radioisotopes is Te-137, which has a half-life of 2.5 seconds. The diagram below represents one of the many nuclear fission reactions.

    heat-and-temperature fig: chem82016-exam_g15.png

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    Base your answers to questions 65 through 68 on the information below and on your knowledge of chemistry.

    Stamping an identification number into the steel frame of a bicycle compresses the crystal structure of the metal. If the number is filed off, there are scientific ways to reveal the number.

    One method is to apply aqueous copper(II) chloride to the number area. The Cu2+ ions react with some iron atoms in the steel frame, producing copper atoms that show the pattern of the number. The ionic equation below represents this reaction.

    Fe(s) + Cu2+(aq) → Fe2+(aq) + Cu(s)

    Another method is to apply hydrochloric acid to the number area. The acid reacts with the iron, producing bubbles of hydrogen gas. The bubbles form faster where the metal was compressed, so the number becomes visible. The equation below represents this reaction.

    2HCl(aq) + Fe(s) → FeCl2(aq) + H2(g)

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    Base your answers to questions 69 through 72 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 73 through 75 on the information below and on your knowledge of chemistry.

    One type of voltaic cell, called a mercury battery, uses zinc and mercury(II) oxide to generate an electric current. Mercury batteries were used because of their miniature size, even though mercury is toxic. The overall reaction for a mercury battery is given in the equation below.

    Zn(s) + HgO(s) → ZnO(s) + Hg(ℓ)

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    Base your answers to questions 76 through 79 on the information below and on your knowledge of chemistry.

    A company produces a colorless vinegar that is 5.0% HC2H3O2 in water. Using thymol blue as an indicator, a student titrates a 15.0-milliliter sample of the vinegar with 43.1 milliliters of a 0.30 M NaOH(aq) solution until the acid is neutralized.

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    Base your answers to questions 80 through 84 on the information below and on your knowledge of chemistry.

    In industry, ethanol is primarily produced by two different reactions. One process involves the reaction of glucose in the presence of an enzyme that acts as a catalyst. The equation below represents this reaction.

    organic-compounds fig: chem82016-exam_g17.png

    In another reaction, ethanol is produced from ethene and water. The equation below represents this reaction in which H2SO4 is a catalyst.

    organic-compounds fig: chem82016-exam_g18.png

    Industrial ethanol can be oxidized using a catalyst to produce ethanal. The equation representing this oxidation is shown below.

    organic-compounds fig: chem82016-exam_g19.png

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