Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry August 2017

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    Base your answers to questions 51 and 52 on the information below and on your knowledge of chemistry.

    The formula below represents a molecule of butanamide.

    chemical-bonds fig: chem82017-exam_g13.png

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

    An equilibrium system in a sealed, rigid container is represented by the equation below.

    CO(g) + H2O(g) ⇌ CO2(g) + H2(g)

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

    The table below contains selected information about chlorine and two compounds containing chlorine. One piece of information is missing for each of the substances in the table.

    states-of-matter fig: chem82017-exam_g15.png

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    Base your answers to questions 59 and 60 on the information below and on your knowledge of chemistry.

    The equation below represents the reaction between 2-methylpropene and hydrogen chloride gas.

    hydrocarbons fig: chem82017-exam_g16.png

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    Base your answers to questions 61 through 65 on the information below and on your knowledge of chemistry.

    Many scientists made observations of the elements that led to the modern Periodic Table. In 1829, Dobereiner found groups of three elements that have similar properties and called each of these groups a triad. Dobereiner noticed a relationship between the atomic masses of the elements in each triad. Triad 1, shown in the table below, consists of sulfur, selenium, and tellurium. The middle element, selenium, has an atomic mass that is close to the sum of the atomic masses of sulfur and tellurium, divided by 2.

    elements-in-the-periodic-table fig: chem82017-exam_g18.png

    The other triads shown in the table below demonstrate the same mathematical relationship.

    elements-in-the-periodic-table fig: chem82017-exam_g17.png

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

    Wood is mainly cellulose, a polymer produced by plants. One use of wood is as a fuel in campfires, fireplaces, and wood furnaces. The molecules of cellulose are long chains of repeating units. Each unit of the chain can be represented as C6H10O5. The balanced equation below represents a reaction that occurs when C6H10O5 is burned in air.

    C6H10O5 + 6O2 → 6CO2 + 5H2O + heat

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

    Millions of tons of ammonia are produced each year for use as fertilizer to increase food production. Most of the hydrogen needed to produce ammonia comes from methane gas reacting with steam. This reaction, which occurs in a container under controlled conditions, is shown below in unbalanced equation 1.

    Equation 1: CH4(g) + H2O(g) + energy → CO(g) + H2(g)

    The reaction that produces ammonia is represented by balanced equation 2, shown below. A catalyst can be used to increase the rate of the reaction.

    Equation 2: N2(g) + 3H2(g) → 2NH3(g) + energy

    A potential energy diagram for equation 2 is shown below.

    chemical-reactions-and-equations fig: chem82017-exam_g20.png

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    Base your answers to questions 73 through 77 on the information below and on your knowledge of chemistry.

    Diethyl ether is used as a laboratory and industrial solvent. The boiling point of diethyl ether at standard pressure is 34.6°C. The equation below represents a reaction that produces diethyl ether.

    organic-compounds fig: chem82017-exam_g21.png

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

    The electrolysis of brine, a concentrated aqueous sodium chloride solution, produces three important industrial chemicals: chlorine gas, hydrogen gas, and sodium hydroxide. The diagram and equation below represent a brine electrolysis cell. Before the battery is connected, the pH value of the brine solution is 7.0.

    electrolytic-cell fig: chem82017-exam_g22.png

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

    The isotope Rn-222 is produced by the decay of uranium in Earth’s crust. Some of this isotope leaks into basements of homes in areas where the ground is more porous. An atom of Rn-222 decays to an atom of Pb-206 through a series of steps as shown on the graph below.

    identification-of-element fig: chem82017-exam_g23.png

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