Regents Chemistry Test Preparation Practice

    Table O Symbols Used In Nuclear Chemistry

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    Base your answers to questions 12 on the information below and on your knowledge of chemistry.

    A student compares some models of the atom. These models are listed in the table below in order of development from top to bottom.

    atomic-concepts, atomic-models, historic-models fig: chem62014-exam_g11.png

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    Base your answers to questions 13 on the information below and on your knowledge of chemistry.

    Cobalt-60 is an artificial isotope of Co-59. The incomplete equation for the decay of cobalt-60, including beta and gamma emissions, is shown below.

    atomic-concepts, isotopes-atomic-mass, periodic-table, identification-of-element fig: chem62019-exam_g13.png

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

    In the past, some paints that glowed in the dark contained zinc sulfide and salts of Ra-226. As the radioisotope Ra-226 decayed, the energy released caused the zinc sulfide in these paints to emit light. The half-lives for Ra-226 and two other radioisotopes used in these paints are listed on the table below.

    nuclear-chemistry, mode-and-rate-of-decay fig: chem12019-exam_g18.png

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    Base your answers to questions 15 on the information below and on your knowledge of chemistry.

    Illuminated EXIT signs are used in public buildings such as schools. If the word EXIT is green, the sign may contain the radioisotope tritium, hydrogen-3. The tritium is a gas sealed in glass tubes. The emissions from the decay of the tritium gas cause a coating on the inside of the tubes to glow.

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