June 2009 Chemistry Regents #63-65

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

63 State, in terms of the number of subatomic particles, one similarity and one difference between the atoms of these isotopes of sulfur. [1]

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Similarity: All atoms of these isotopes have the same number of protons.

Difference: An S-32 atom has 16 neutrons, an S-33 atom has 17 neutrons, an S-34 atom has 18 neutrons, and an S-36 atom has 20 neutrons.

Similarity: Every sulfur atom has 16 protons.

Difference: The number of neutrons in an atom of one isotope is different than the number of neutrons in an atom of a different isotope.

MY Answer= Sim. # protons    Differ. # neutrons  (It is the definition of an isomer.)

64 In the space in your answer booklet, draw a Lewis electron-dot diagram for an atom of sulfur-33. [1]

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65 In the space in your answer booklet, show a correct numerical setup for calculating the atomic mass of sulfur. [1]

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(31.97)(0.9493) + (32.97)(0.0076) + (33.97)(0.0429) + (35.97)(0.0002)

or

(31.97)(94.93) + (32.97)(0.76) + (33.97)(4.29) + (35.97)(0.02)

100

DO NOT SOLVE

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