Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry June 2019

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    Base your answers to questions 52 through 54 on the information below and on your knowledge of chemistry.

    The atomic mass and natural abundance of the naturally occuring isotopes of hydrogen are shown in the table below.

    proton-neutron-electron fig: chem62019-exam_g12.png

    The isotope H-2, also called deuterium, is usually represented by the symbol “D.” Heavy water forms when deuterium reacts with oxygen, producing molecules of D2O.

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    Base your answers to questions 55 through 57 on the information below and on your knowledge of chemistry.

    At 23°C, 85.0 grams of NaNO3(s) are dissolved in 100. grams of H2O(ℓ).

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    Base your answers to questions 58 through 61 on the information below and on your knowledge of chemistry.

    A 200.-milliliter sample of CO2(g) is placed in a sealed, rigid cylinder with a movable piston at 296 K and 101.3 kPa.

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

    Cobalt-60 is an artifi cial isotope of Co-59. The incomplete equation for the decay of cobalt-60, including beta and gamma emissions, is shown below.

    isotopes-atomic-mass fig: chem62019-exam_g13.png

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    Base your answers to questions 66 through 69 on the information below and on your knowledge of chemistry.

    During a laboratory activity, appropriate safety equipment was used and safety procedures were followed. A laboratory technician heated a sample of solid KClO3 in a crucible to determine the percent composition by mass of oxygen in the compound. The unbalanced equation and the data for the decomposition of solid KClO3 are shown below.

    compounds fig: chem62019-exam_g14.png

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    Base your answers to questions 70 through 73 on the information below and on your knowledge of chemistry.

    A bottled water label lists the ions dissolved in the water. The table below lists the mass of some ions dissolved in a 500.-gram sample of the bottled water.

    significent-figures-conversions fig: chem62019-exam_g15.png

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    Base your answers to questions 74 through 77 on the information below and on your knowledge of chemistry.

    Ethyl ethanoate is used as a solvent for varnishes and in the manufacture of artifi cial leather. The formula below represents a molecule of ethyl ethanoate.

    organic-compounds fig: chem62019-exam_g16.png

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    Base your answers to questions 78 through 80 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.

    voltaic-cell fig: chem62019-exam_g17.png

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    Base your answers to questions 81 through 85 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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