Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry June 2015

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    Base your answers to questions 48 and 49 on the graph below and on your knowledge of chemistry.

    organic-compounds fig: chem62015-exam_g8.png

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

    Three elements, represented by D, E, and Q, are located in Period 3. Some properties of these elements are listed in the table below. A student’s experimental result indicates that the density of element Q is 2.10 g/cm3, at room temperature and standard pressure.

    identification-of-element fig: chem62015-exam_g10.png

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

    The equation below represents an equilibrium system of SO2(g), O2(g), and SO3(g). The reaction can be catalyzed by vanadium or platinum.

    2SO2(g) + O2(g) ⇌ 2SO3(g) + energy

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

    The formulas for two compounds are shown below.

    hydrocarbons fig: chem62015-exam_g11.png

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

    Some isotopes of potassium are K-37, K-39, K-40, K-41, and K-42. The natural abundance and the atomic mass for the naturally occurring isotopes of potassium are shown in the table below.

    mode-and-rate-of-decay fig: chem62015-exam_g12.png

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

    The Bohr model of the atom was developed in the early part of the twentieth century. A diagram of the Bohr model for one atom, in the ground state, of a specific element is shown below. The nucleus of this atom contains 4 protons and 5 neutrons.

    identification-of-element fig: chem62015-exam_g13.png

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

    In 1828, Friedrich Wöhler produced urea when he heated a solution of ammonium cyanate. This reaction is represented by the balanced equation below.

    organic-compounds fig: chem62015-exam_g14.png

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    Base your answers to questions 73 through 75 on the information below and on your knowledge of chemistry.

    Rubbing alcohol sold in stores is aqueous 2-propanol, CH3CHOHCH3(aq). Rubbing alcohol is available in concentrations of 70.% and 91% 2-propanol by volume.

    To make 100. mL of 70.% aqueous 2-propanol, 70. mL of 2-propanol is diluted with enough water to produce a total volume of 100. mL. In a laboratory investigation, a student is given a 132-mL sample of 91% aqueous 2-propanol to separate using the process of distillation.

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    Base your answers to questions 76 through 79 on the information below and on your knowledge of chemistry.

    A sample of seawater is analyzed. The table below gives the concentration of some ions in the sample.

    compounds fig: chem62015-exam_g15.png

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

    A scientist bubbled HCl(g) through a sample of H2O(ℓ). This process is represented by the balanced equation below.

    H2O(ℓ) + HCl(g) → H3O+(aq) + Cl(aq)

    The scientist measured the pH of the liquid in the flask before and after the gas was bubbled through the water. The initial pH value of the water was 7.0 and the final pH value of the solution was 3.0.

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

    A small digital clock can be powered by a battery made from two potatoes and some household materials. The “potato clock” battery consists of two cells connected in a way to produce enough electricity to allow the clock to operate. In each cell, zinc atoms react to form zinc ions. Hydrogen ions from phosphoric acid in the potatoes react to form hydrogen gas. The labeled diagram and balanced ionic equation below show the reaction, the materials, and connections necessary to make a “potato clock” battery.

    voltaic-cell fig: chem62015-exam_g16.png

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