OLD UNIT 3 TEST #1 (REG. CHEM.)

Part 1 - Matching

C    1.)  Chadwick                (A) discovered the nucleus
D    2.)  Democritus              (B) first to get his ideas about atoms published
E    3.)  Thomson                 (C) discovered the neutron
B    4.)  Dalton                     (D) first to say that matter was made of atoms
A    5.)  Rutherford               (E) discovered the electron

Part 2 - Multiple Choice

6.)  The mass of the neutron is
        (A) about the same as that of a proton            (B) about the same as that of an electron
        (C) double that of a proton                             (D) double that of an electron

7.)  Most of the volume of an atom is made up of the
        (A) nucleus            (B) nuclides            (C) electron cloud            (D) protons

8.)  As the atomic masses of the elements on the Periodic Table increase, the number of atoms in one mole of each
      element
        (A) decreases            (B) increases            (C) remains the same            (D) becomes a negative number

9.)  As the mass number of the isotopes of a particular element increases, the number of protons in each isotope of
      the element
        (A) decreases            (B) increases            (C) remains the same            (D) varies unpredictably

10.)  The electric charge and mass number of a neutron are, respectively,
        (A) +1 and 1            (B) -1 and 1            (C) +1 and 0            (D) 0 and 1

11.)  Neon has an atomic number of 10.  Calcium has an atomic number of 20.  Compared to a mole of neon, a
        mole of calcium contains
        (A) twice as many atoms            (B) an equal number of atoms            (C) half as many atoms
        (D) 10 times as many atoms        (E) 20 times as many atoms

12.)  Atoms of the same element can differ in
        (A) chemical properties            (B) mass number            (C) atomic number            (D) number of protons

13.)  What is the approximate mass of an isotope of lithium that has three electrons, three protons, and five
        neutrons?
        (A) 5 amu            (B) 6 amu            (C) 7 amu            (D) 8 amu            (E) 11 amu

14.)  Subtracting the atomic number from the mass number gives the number of
        (A) protons            (B) neutrons            (C) electrons            (D) energy levels

15.)  An element consists of atoms, all of which have nuclei containing the same number of
        (A) neutrons            (B) electrons            (C) protons            (D) protons plus neutrons

16.)  The smallest unit of an element that can exist either alone or in combination is the 
        (A) proton            (B) atom            (C) electron            (D) molecule

17.)  How many neutrons does fluorine-17 have in its nucleus?
        (A) 9            (B) 8            (C) 7            (D) 6

18.)  What is the mass number of an atom that has 10 protons, 12 neutrons, and 10 electrons?
        (A) 2            (B) 10            (C) 20            (D) 22            (E) 32

19.)  For the element carbon, the numerical expression "12.011" is its
        (A) mass number            (B) atomic number            (C) average atomic mass

20.)  The atomic number of oxygen indicates that there are eight
        (A) protons in the nucleus of an oxygen atom            (B) oxygen nuclides
        (C) neutrons
outside the atom's nucleus                    (D) energy levels moving about the nucleus

Part 3 - Tell whether the following describes
            (A) a proton            (B) a neutron        or         (C) an electron

A    21.)  The number of this particle in the atom determines what element it is

C    22.)  This particle has a mass that is about 1800 times less than 1 amu

C    23.)  This particle has a negative charge

B    24.)  The number of this particle is different in isotopes of the same element

B    25.)  This particle is neutral

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