Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry June 2012

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    Base your answers to questions 52 through 55 on the information below.

    The reaction between aluminum and an aqueous solution of copper(II) sulfate is represented by the unbalanced equation below.

    Al(s) + CuSO4(aq) → Al2(SO4)3(aq) + Cu(s)

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    Base your answers to questions 56 through 59 on the information below.

    A total of 1.4 moles of sodium nitrate is dissolved in enough water to make 2.0 liters of an aqueous solution. The gram-formula mass of sodium nitrate is 85 grams per mole.

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    Base your answers to questions 60 through 62 on the information below.

    Calcium reacts with water. This reaction is represented by the balanced equation below. The aqueous product of this reaction can be heated to evaporate the water, leaving a white solid, Ca(OH)2(s).

    Ca(s) + 2H2O(ℓ) → Ca(OH)2(aq) + H2(g)

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    Base your answers to questions 63 through 65 on the information below.

    In a titration, 20.0 milliliters of 0.15 M HCl(aq) is exactly neutralized by 18.0 milliliters of KOH(aq).

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    Base your answers to questions 66 through 68 on the information below.

    John Dalton, an early scientist, sketched the structure of compounds using his own symbols for the elements known at the time. Dalton’s symbols for four elements and his drawing of potassium aluminum sulfate are represented by the diagram below.

    bonding-tendency-of-elements fig: chem62012-exam_g22.png

    Today, it is known that the chemical formula for potassium aluminum sulfate is KAl(SO4)2•12H2O. It is a hydrated compound because water molecules are included within its crystal structure. There are 12 moles of H2O for every 1 mole of KAl(SO4)2. The compound contains two different positive ions. The gram-formula mass of KAl(SO4)2•12H2O is 474 grams per mole.

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    Base your answers to questions 69 through 71 on the information below.

    At standard pressure, hydrogen peroxide, H2O2, melts at −0.4°C, boils at 151°C, and is very soluble in water. A bottle of aqueous hydrogen peroxide, H2O2(aq), purchased from a pharmacy has a pressure-releasing cap. Aqueous hydrogen peroxide decomposes at room temperature, as represented by the balanced equation below.

    2H2O2(aq) → 2H2O(ℓ) + O2(g) + 196.0 kJ

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    Base your answers to questions 72 through 75 on the information below.

    A student constructs an electrochemical cell during a laboratory investigation. When the switch is closed, electrons flow through the external circuit. The diagram and equation below represent this cell and the reaction that occurs.

    voltaic-cell fig: chem62012-exam_g23.png

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    Base your answers to questions 76 through 78 on the information below.

    The diagram below shows typical pH values found in four parts of the human digestive system. In the small intestine, the enzyme lipase acts as a catalyst, increasing the rate of fat digestion.

    acidity-ph-and-indicators fig: chem62012-exam_g24.png

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    Base your answers to questions 79 through 81 on the information below.

    One type of soap is produced when ethyl stearate and sodium hydroxide react. The soap produced by this reaction is called sodium stearate. The other product of the reaction is ethanol. This reaction is represented by the balanced equation below.

    types-of-organic-reactions fig: chem62012-exam_g25.png

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    Base your answers to questions 82 through 85 on the information below.

    Nuclear fission has been used to produce electricity. However, nuclear fusion for electricity production is still under development. The notations of some nuclides used in nuclear reactions are shown in the table below.

    nuclear-reactions fig: chem62012-exam_g26.png

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