Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry January 2014

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

    The diagram below represents three elements in Group 13 and three elements in Period 3 and their relative positions on the Periodic Table.

    properties-in-a-group fig: chem12014-exam_g8.png

    Some elements in the solid phase exist in different forms that vary in their physical properties. For example, at room temperature, red phosphorus has a density of 2.16 g/cm3 and white phosphorus has a density of 1.823 g/cm3.

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

    The compounds KNO3 and NaNO3 are soluble in water.

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    Base your answers to questions 58 through 61 on the information below and on your knowledge of chemistry.

    Ethene and hydrogen can react at a faster rate in the presence of the catalyst platinum. The equation below represents a reaction between ethene and hydrogen.

    formula-mass-and-gram-formula-mass fig: chem12014-exam_g9.png

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    Base your answers to questions 62 and 63 on the information below and on your knowledge of chemistry.

    In a titration, 50.0 milliliters of 0.026 M HCl(aq) is neutralized by 38.5 milliliters of KOH(aq).

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

    Table sugar, sucrose, is a combination of two simple sugars, glucose and fructose. The formulas below represent these simple sugars.

    functional-groups-and-types-of-organic-compounds fig: chem12014-exam_g10.png

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    Base your answers to questions 66 through 70 on the information below and on your knowledge of chemistry.

    Baking soda, NaHCO3, can be commercially produced during a series of chemical reactions called the Solvay process. In this process, NH3(aq), NaCl(aq), and other chemicals are used to produce NaHCO3(s) and NH4Cl(aq).

    To reduce production costs, NH3(aq) is recovered from NH4Cl(aq) through a different series of reactions. This series of reactions can be summarized by the overall reaction represented by the unbalanced equation below.

    NH4Cl(aq) + CaO(s) → NH3(aq) + H2O(ℓ) + CaCl2(aq)

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    Base your answers to questions 71 through 75 on the information below and on your knowledge of chemistry.

    Rubbing alcohol is a product available at most pharmacies and supermarkets. One rubbing alcohol solution contains 2-propanol and water. The boiling point of 2-propanol is 82.3°C at standard pressure.

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    Base your answers to questions 76 and 77 on the information below and on your knowledge of chemistry.

    Silver-plated utensils were popular before stainless steel became widely used to make eating utensils. Silver tarnishes when it comes in contact with hydrogen sulfide, H2S, which is found in the air and in some foods. However, stainless steel does not tarnish when it comes in contact with hydrogen sulfide.

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

    Common household bleach is an aqueous solution containing hypochlorite ions. A closed container of bleach is an equilibrium system represented by the equation below.

    Cl2(g) + 2OH(aq) ⇌ ClO(aq) + Cl(aq) + H2O(ℓ)

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

    Iodine has many isotopes, but only iodine-127 is stable and is found in nature. One radioactive iodine isotope, I-108, decays by alpha particle emission. Iodine-131 is also radioactive and has many important medical uses.

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