Regents Chemistry Test Preparation Practice

    Periodic Table

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    Base your answers to questions 12 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.

    periodic-table, elements-in-the-periodic-table, atomic-concepts, atomic-models, historic-models fig: chem62013-exam_g16.png

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    Base your answers to questions 13 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.

    periodic-table, identification-of-element fig: chem62015-exam_g10.png

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    Base your answers to questions 14 on the information below and on your knowledge of chemistry.

    • A test tube contains a sample of solid stearic acid, an organic acid.
    • Both the sample and the test tube have a temperature of 22.0°C.
    • The stearic acid melts after the test tube is placed in a beaker with 320. grams of water at 98.0°C.
    • The temperature of the liquid stearic acid and water in the beaker reaches 74.0°C.
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    Base your answers to questions 15 on the information below and on your knowledge of chemistry.

    In the late 1800s, Dmitri Mendeleev developed a periodic table of the elements known at that time. Based on the pattern in his periodic table, he was able to predict properties of some elements that had not yet been discovered. Information about two of these elements is shown in the table below.

    physical-behavior-of-matter, states-of-matter fig: chem62018-exam_g25.png

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