Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry August 2015

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    Base your answers to questions 58 and 59 on the information below and on your knowledge of chemistry.

    A sample of a substance is a liquid at 65°C. The sample is heated uniformly to 125°C. The heating curve for the sample at standard pressure is shown below.

    heat-and-temperature fig: chem82015-exam_g8.png

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    Base your answers to questions 60 and 61 on the information below and on your knowledge of chemistry.

    A sample of nitric acid contains both H3O+ ions and NO3 ions. This sample has a pH value of 1.

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

    One fission reaction for U-235 is represented by the balanced nuclear equation below.

    nuclear-reactions fig: chem82015-exam_g9.png

    Both radioisotopes produced by this fission reaction undergo beta decay. The half-life of Xe-140 is 13.6 seconds and the half-life of Sr-94 is 1.25 minutes.

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    Base your answers to questions 66 through 68 on the information below and on your knowledge of chemistry.

    The two naturally occurring isotopes of antimony are Sb-121 and Sb-123. The table below shows the atomic mass and percent natural abundance for these isotopes.

    formula-mass-and-gram-formula-mass fig: chem82015-exam_g10.png

    Antimony and sulfur are both found in the mineral stibnite, Sb2S3. To obtain antimony, stibnite is roasted (heated in air), producing oxides of antimony and sulfur. The unbalanced equation below represents one of the reactions that occurs during the roasting.

    Sb2S3(s) + O2(g) → Sb2O3(s) + SO2(g)

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

    In a laboratory investigation, ammonium chloride was dissolved in water. Laboratory procedures and corresponding observations made by a student during the investigation are shown in the table below.

    bonding-tendency-of-elements fig: chem82015-exam_g11.png

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    Base your answers to questions 73 and 74 on the information below and on your knowledge of chemistry.

    Coal is a fuel consisting primarily of carbon. In an open system, the carbon that burns completely in air produces carbon dioxide and heat. This reaction is represented by the balanced equation below.

    C(s) + O2(g) → CO2(g) + heat

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    Base your answers to questions 75 and 76 on the information below and on your knowledge of chemistry.

    During the winter months, icy roads pose a threat to motorists and can lead to accidents. A mixture of sand and sodium chloride, NaCl, can be spread on roads to make winter driving safer.

    One New York town requires that a mixture of sand and salt used on residential roads should contain 25% or less of NaCl by mass. A 10.0-gram sample of a mixture of sand and NaCl was analyzed and found to contain 3.3 grams of NaCl.

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    Base your answers to questions 77 and 78 on the information below and on your knowledge of chemistry.

    In a laboratory investigation, a solution that contains 13.2 grams of Pb(NO3)2 reacts completely with a solution that contains 12.0 grams of NaI, producing 18.4 grams of PbI2 and an undetermined mass of a second product, NaNO3. This reaction is represented by the balanced equation below.

    Pb(NO3)2 + 2NaI → PbI2 + 2NaNO3

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    Base your answers to questions 79 and 80 on the information below and on your knowledge of chemistry.

    Two organic compounds, geraniol and linalool, can be represented by the molecular formula C10H18O. Geraniol has an odor similar to the scent of roses and linalool has an odor similar to the scent of citrus fruits. Both compounds are nearly insoluble in water. The structural formulas of geraniol and linalool are shown below.

    functional-groups-and-types-of-organic-compounds fig: chem82015-exam_g12rd050.png

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    Base your answers to questions 81 and 82 on the information below and on your knowledge of chemistry.

    The gastric juice of the human stomach has a pH value of approximately 1.5. Hydrochloric acid in the gastric juice is necessary for the digestion process. However, excess hydrochloric acid may harm the stomach lining. One type of antacid uses Mg(OH)2(s) to neutralize excess hydrochloric acid in the stomach. This neutralization is represented by the incomplete equation below.

    Mg(OH)2(s) + 2HCl(aq) → ___ (aq) + 2H2O(ℓ)

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    Base your answers to questions 83 through 85 on the information below and on your knowledge of chemistry.

    Early scientists defined oxidation as a chemical reaction in which oxygen combined with another element to produce an oxide of the element. An example of oxidation based on this definition is the combustion of methane. This reaction is represented by the balanced equation below.

    Equation 1: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

    The definition of oxidation has since been expanded to include many reactions that do not involve oxygen. An example of oxidation based on this expanded definition is the reaction between magnesium ribbon and powdered sulfur when heated in a crucible. This reaction is represented by the balanced equation below.

    Equation 2: Mg(s) + S(s) → MgS(s)

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