Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry August 2018

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    Base your answers to questions 53 through 55 on the information below and on your knowledge of chemistry.

    The table below shows data for three isotopes of the same element.

    isotopes-atomic-mass fig: chem82018-exam_g8.png

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    Base your answers to questions 56 through 58 on the information below and on your knowledge of chemistry.

    The elements in Group 2 on the Periodic Table can be compared in terms of first ionization energy, electronegativity, and other general properties.

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    Base your answers to questions 59 through 61 on the information below and on your knowledge of chemistry.

    A saturated solution of sulfur dioxide is prepared by dissolving SO2(g) in 100. g of water at 10.°C and standard pressure.

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    Base your answers to questions 62 through 65 on the information below and on your knowledge of chemistry.

    Starting as a solid, a sample of a molecular substance is heated, until the entire sample of the substance is a gas. The graph below represents the relationship between the temperature of the sample and the elapsed time.

    states-of-matter fig: chem82018-exam_g9.png

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    Base your answers to questions 69 through 71 on the information below and on your knowledge of chemistry.

    In a laboratory activity, each of four different masses of KNO3(s) is placed in a separate test tube that contains 10.0 grams of H2O at 25°C.

    When each sample is first placed in the water, the temperature of the mixture decreases. The mixture in each test tube is then stirred while it is heated in a hot water bath until all of the KNO3(s) is dissolved. The contents of each test tube are then cooled to the temperature at which KNO3 crystals first reappear. The procedure is repeated until the recrystallization temperatures for each mixture are consistent, as shown in the table below.

    physical-change-and-chemical-change fig: chem82018-exam_g10.png

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    Base your answers to questions 72 through 74 on the information below and on your knowledge of chemistry.

    The balanced equation below represents the reaction between carbon monoxide and oxygen to produce carbon dioxide.

    2CO(g) + O2(g) → 2CO2(g) + energy

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    Base your answers to questions 75 through 77 on the information below and on your knowledge of chemistry.

    The equation below represents an industrial preparation of diethyl ether.

    organic-compounds fig: chem82018-exam_g11.png

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    Base your answers to questions 78 through 81 on the information below and on your knowledge of chemistry.

    A student is to determine the concentration of an NaOH(aq) solution by performing two different titrations. In a first titration, the student titrates 25.0 mL of 0.100 M H2SO4(aq) with NaOH(aq) of unknown concentration.

    In a second titration, the student titrates 25.0 mL of 0.100 M HCl(aq) with a sample of the NaOH(aq). During this second titration, the volume of the NaOH(aq) added and the corresponding pH value of the reaction mixture is measured. The graph below represents the relationship between pH and the volume of the NaOH(aq) added for this second titration.

    arrhenius-acids-and-bases fig: chem82018-exam_g12.png

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    Base your answers to questions 82 through 85 on the information below and on your knowledge of chemistry.

    When uranium-235 nuclei are bombarded with neutrons, many different combinations of smaller nuclei can be produced. The production of neodymium-150 and germanium-81 in one of these reactions is represented by the equation below.

    nuclear-reactions fig: chem82018-exam_g13.png

    Germanium-81 and uranium-235 have different decay modes. Ge-81 emits beta particles and has a half-life of 7.6 seconds.

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