School: Atom and Answer Booklet Essay

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The University of the State of New York
REGENTS HIGH SCHOOL EXAMINATION

PHYSICAL SETTING

CHEMISTRY
Tuesday, June 24, 2003 — 9:15 a.m. to 12:15 p.m., only
This is a test of your knowledge of chemistry. Use that knowledge to answer all questions in this examination. Some questions may require the use of the Reference
Tables for Physical Setting/Chemistry. You are to answer all questions in all parts of this examination according to the directions provided in the examination booklet.
Your answer sheet for Part A and Part B–1 is the last page of this examination booklet. Turn to the last page and fold it along the perforations. Then, slowly and carefully, tear off your answer sheet and fill in the heading.
The answers to the questions in Part B–2 and Part C are to be written in your separate answer booklet. Be sure to fill in the heading on the front of your answer booklet. Record the number of your choice for each Part A and Part B–1 multiple-choice question on your separate answer sheet. Write your answers to the Part B–2 and
Part C questions in your answer booklet. All work should be written in pen, except for graphs and drawings, which should be done in pencil. You may use scrap paper to work out the answers to the questions, but be sure to record all your answers on your separate answer sheet and in your answer booklet.
When you have completed the examination, you must sign the statement printed at the end of your separate answer sheet, indicating that you had no unlawful knowledge of the questions or answers prior to the examination and that you have neither given nor received assistance in answering any of the questions during the examination. Your answer sheet and answer booklet cannot be accepted if you fail to sign this declaration.
Notice. . .
A four-function or scientific calculator and a copy of the Reference Tables for Physical
Setting/Chemistry must be available for your use while taking this examination.

DO NOT OPEN THIS EXAMINATION BOOKLET UNTIL THE SIGNAL IS GIVEN.

Part A
Answer all questions in this part.
Directions (1–35): For each statement or question, write on the separate answer sheet the number of the word or expression that, of those given, best completes the statement or answers the question. Some questions may require the use of the Reference Tables for Physical Setting/Chemistry.
7 Alpha particles are emitted during the radioactive decay of
(1) carbon-14
(3) calcium-37
(2) neon-19
(4) radon-222

1 The atomic number of an atom is always equal to the number of its
(1) protons, only
(2) neutrons, only
(3) protons plus neutrons
(4) protons plus electrons

8 Which is an empirical formula?
(1) P2O5
(3) C2H4
(2) P4O6
(4) C3H6

2 Which subatomic particle has no charge?
(1) alpha particle
(3) neutron
(2) beta particle
(4) electron

9 Which substance can be decomposed by a chemical change?
(1) Co
(3) Cr
(2) CO
(4) Cu

3 When the electrons of an excited atom return to a lower energy state, the energy emitted can result in the production of
(1) alpha particles
(3) protons
(2) isotopes
(4) spectra

10 The percent by mass of calcium in the compound calcium sulfate (CaSO4) is approximately
(1) 15%
(3) 34%
(2) 29%
(4) 47%

4 The atomic mass of an element is calculated using the
(1) atomic number and the ratios of its naturally occurring isotopes
(2) atomic number and the half-lives of each of its isotopes
(3) masses and the ratios of its naturally occurring isotopes
(4) masses and the half-lives of each of its isotopes

11 What is represented by the dots in a Lewis electron-dot diagram of an atom of an element in Period 2 of the Periodic Table?
(1) the number of neutrons in the atom
(2) the number of protons in the atom
(3) the number of valence electrons in the atom
(4) the total number of electrons in the atom

5 The region that is the most probable location of an electron in an atom is
(1) the nucleus
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