Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry June 2013

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    Base your answers to questions 51 through 53 on the information below and on your knowledge of chemistry.

    When magnesium is ignited in air, the magnesium reacts with oxygen and nitrogen. The reaction between magnesium and nitrogen is represented by the unbalanced equation below.

    Mg(s) + N2(g) → Mg3N2(s)

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    Base your answers to questions 54 through 56 on the information below and on your knowledge of chemistry.

    The balanced equation below represents a reaction.

    O2(g) + energy → O(g) + O(g)

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    Base your answers to questions 57 through 59 on the information below and on your knowledge of chemistry.

    Starting as a solid at −25°C, a sample of H2O is heated at a constant rate until the sample is at 125°C. This heating occurs at standard pressure. The graph below represents the relationship between temperature and heat added to the sample.

    heating-curves-calculation-of-heat fig: chem62013-exam_g13.png

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    Base your answers to questions 60 through 62 on the information below and on your knowledge of chemistry.

    Cylinder A has a movable piston and contains hydrogen gas. An identical cylinder, B, contains methane gas. The diagram below represents these cylinders and the conditions of pressure, volume, and temperature of the gas in each cylinder.

    number-of-paritcles-and-valumes-of-gases fig: chem62013-exam_g14.png

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    Base your answers to questions 63 through 65 on the information below and on your knowledge of chemistry.

    There are several isomers of C6H14. The formulas and boiling points for two of these isomers are given in the table below.

    hydrocarbons fig: chem62013-exam_g15.png

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

    Before atomic numbers were known, Mendeleev developed a classification system for the 63 elements known in 1872, using oxide formulas and atomic masses. He used an R in the oxide formulas to represent any element in each group. The atomic mass was listed in parentheses after the symbol of each element. A modified version of Mendeleev’s classification system is shown in the table below.

    elements-in-the-periodic-table fig: chem62013-exam_g16.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 apparatus, a sample of lead(II) oxide reacts with hydrogen gas at high temperature. The products of this reaction are liquid lead and water vapor. As the reaction proceeds, water vapor and excess hydrogen gas leave the glass tube. The diagram and balanced equation below represent this reaction.

    oxidation-numbers-(states) fig: chem62013-exam_g17.png

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

    In the late 19th century, the Hall-Herroult process was invented as an inexpensive way to produce aluminum. In this process, Al2O3(ℓ) extracted from bauxite is dissolved in Na3AlF6(ℓ) in a graphite-lined tank, as shown in the diagram below. The products are carbon dioxide and molten aluminum metal.

    classification-of-matter fig: chem62013-exam_g18.png

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    Base your answers to questions 78 through 80 on the information below and on your knowledge of chemistry.

    One process used to manufacture sulfuric acid is called the contact process. One step in this process, the reaction between sulfur dioxide and oxygen, is represented by the forward reaction in the system at equilibrium shown below.

    2SO2(g) + O2(g) ⇌ 2SO3(g) + 394 kJ

    A mixture of platinum and vanadium(V) oxide may be used as a catalyst for this reaction. The sulfur trioxide produced is then used to make sulfuric acid.

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

    Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.

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

    Chemical concepts are applied in candy making. A recipe for making lollipops is shown below.

    solutions fig: chem62013-exam_g19rd050.png

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