Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry January 2019

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    Base your answers to questions 51 through 54 on the information below and on your knowledge of chemistry.

    The formulas and names of four chloride compounds are shown in the table below.

    octet-rule fig: chem12019-exam_g11.png

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

    Some isotopes of neon are Ne-19, Ne-20, Ne-21, Ne-22, and Ne-24. The neon-24 decays by beta emission. The atomic mass and natural abundance for the naturally occurring isotopes of neon are shown in the table below.

    mode-and-rate-of-decay fig: chem12019-exam_g12.png

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    Base your answers to questions 58 through 60 on the information below and on your knowledge of chemistry.

    Periodic trends are observed in the properties of the elements in Period 3 on the Periodic Table. These elements vary in physical properties, such as phase, and in chemical properties, such as their ability to lose or gain electrons during a chemical reaction.

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    Base your answers to questions 61 through 63 on the information below and on your knowledge of chemistry.

    A thiol is very similar to an alcohol, but a thiol has a sulfur atom instead of an oxygen atom in the functional group. The equation below represents a reaction of methanethiol and iodine, producing dimethyl disulfide and hydrogen iodide.

    hydrocarbons fig: chem12019-exam_g13.png

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    Base your answers to questions 64 and 65 on the information below and on your knowledge of chemistry.

    A student constructs an electrochemical cell. A diagram of the operating cell and the unbalanced ionic equation representing the reaction occurring in the cell are shown below.

    The blue color of the solution in the copper half-cell indicates the presence of Cu2+ ions. The student observes that the blue color becomes less intense as the cell operates.

    voltaic-cell fig: chem12019-exam_g14.png

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

    In a laboratory investigation, a student is given a sample that is a mixture of 3.0 grams of NaCl(s) and 4.0 grams of sand, which is mostly SiO2(s). The purpose of the investigation is to separate and recover the compounds in the sample. In the first step, the student places the sample in a 250-mL flask. Then, 50. grams of distilled water are added to the flask, and the contents are thoroughly stirred. The mixture in the flask is then filtered, using the equipment represented by the diagram below.

    solutions fig: chem12019-exam_g15.png

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

    In a laboratory activity, the volume of helium gas in a rigid cylinder with a movable piston is varied by changing the temperature of the gas. The activity is done at a constant pressure of 100. kPa. Data from the activity are plotted on the graph below.

    gas-lows fig: chem12019-exam_g16.png

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    Base your answers to questions 74 through 76 on the information below and on your knowledge of chemistry.

    The balanced equation below represents the reaction between a 5.0-gram sample of zinc metal and a 0.5 M solution of hydrochloric acid. The reaction takes place in an open test tube at 298 K and 1 atm in a laboratory activity.

    Zn(s) + 2HCl(aq) → H2(g) + ZnCl2(aq) + energy

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    Base your answers to questions 77 through 79 on the information below and on your knowledge of chemistry.

    Crude oil, primarily a mixture of hydrocarbons, is separated into useful components in a fractionating tower. At the bottom of the tower, the crude oil is heated to about 400°C. The gases formed rise and cool. Most of the gases condense and are collected as liquid fractions. The table below shows the temperature ranges for collecting various hydrocarbon fractions.

    hydrocarbons fig: chem12019-exam_g17.png

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    Base your answers to questions 80 through 82 on the information below and on your knowledge of chemistry.

    In a laboratory activity, a student titrates a 20.0-milliliter sample of HCl(aq) using 0.025 M NaOH(aq). In one of the titration trials, 17.6 milliliters of the base solution exactly neutralizes the acid sample.

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

    In the past, some paints that glowed in the dark contained zinc sulfide and salts of Ra-226. As the radioisotope Ra-226 decayed, the energy released caused the zinc sulfide in these paints to emit light. The half-lives for Ra-226 and two other radioisotopes used in these paints are listed on the table below.

    mode-and-rate-of-decay fig: chem12019-exam_g18.png

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