Regents Chemistry Test Preparation Practice

    Atom And The Ion

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    Base your answers to questions 6 on the information below and on your knowledge of chemistry.

    Solid sodium chloride, also known as table salt, can be obtained by the solar evaporation of seawater and from underground mining. Liquid sodium chloride can be decomposed by electrolysis to produce liquid sodium and chlorine gas, as represented by the equation below.

    2NaCl(ℓ) → 2Na(ℓ) + Cl2(g)

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    Base your answers to questions 7 on the information below and on your knowledge of chemistry.

    A bottled water label lists the ions dissolved in the water. The table below lists the mass of some ions dissolved in a 500.-gram sample of the bottled water.

    significent-figures-conversions fig: chem62019-exam_g15.png

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    Base your answers to questions 8 on the information below and on your knowledge of chemistry.

    The formulas and names of four chloride compounds are shown in the table below.

    octet-rule fig: chem12019-exam_g11.png

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    Base your answers to questions 9 on the information below and on your knowledge of chemistry.

    The radius of a lithium atom is 130. picometers, and the radius of a fluorine atom is 60. picometers. The radius of a lithium ion, Li+, is 59 picometers, and the radius of a fluoride ion, F, is 133 picometers.

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    Base your answers to questions 10 on the information below and on your knowledge of chemistry.

    Potassium phosphate, K3PO4, is a source of dietary potassium found in a popular cereal. According to the Nutrition-Facts label shown on the boxes of this brand of cereal, the accepted value for a one-cup serving of this cereal is 170. milligrams of potassium. The minimum daily requirement of potassium is 3500 milligrams for an adult human.

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    Base your answers to questions 11 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 13 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 14 on the information below.

    The atomic number and corresponding atomic radius of the Period 3 elements are shown in the data table below.

    significent-figures-conversions fig: chem12013-exam_g16.png

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    Base your answers to questions 15 on the information below.

    The diagram below represents an operating electrolytic cell used to plate silver onto a nickel key. As the cell operates, oxidation occurs at the silver electrode and the mass of the silver electrode decreases.

    electrolytic-cell fig: chem12012-exam_g16.png

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