UNIT 3 TEST #3 (HONORS CHEM.)

1.  Nickel - 60 (atomic number 28) has
        (A) 28 neutrons        (B) 32 neutrons        (C) 60 neutrons        (D) 88 neutrons

2.  The discovery of the electron resulted from experiments using
        (A) gold foil        (B) cathode rays        (C) neutrons        (D) alpha particles

3.  The average atomic mass of an element depends on both the masses of its isotopes and each isotope's
        (A) atomic number        (B) radiactivity        (C) percent abundance        (D) mass number

4.  As the mass number of the isotopes of an element increases, the number of protons
        (A) decreases        (B) increases        (C) remains the same        (D) varies unpredictably

5.  To determine the molar mass of an element, one must know the element's
        (A) Avogado's number        (B) atomic number        (C) number of isotopes        (D) average atomic mass

6.  The mass of a sample of nickel (atomic mass 58.69 amu) is 176.07 g.  It contains
        (A) 1.7607 x 1024 atoms            (B) 1.806 x 1024 atoms       
        (C) 5.869 x 1023 atoms              (D) 5.869 x 1024 atoms

7.  An atom is electrically neutral because
        (A) neutrons balance the protons and electrons
        (B) nuclear forces stabilize the charges
        (C) the numbers of protons and electrons are equal
        (D) the numbers of protons and neutrons are equal

8.  Chlorine has an atomic number of 17 and a mass number of 35.  It has
        (A) 17 protons, 17 electrons, & 18 neutrons        (B) 35 protons, 35 electrons, & 17 neutrons
        (C) 17 protons, 17 electrons, & 52 neutrons        (D) 18 protons, 18 electrons, & 17 neutrons

9.  The number of atoms in 1 mole of carbon is
        (A) 6.022 x 1022         (B) 6.022 x 1023        (C) 5.022 x 1022        (D) 5.022 x 1023

10.  A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
        (A) nuclide        (B) neutron        (C) electron        (D) isotope

11.  An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons.  Its mass number is
        (A) 13        (B) 14        (C) 27        (D) 40

12.  Who discovered the nucleus by bombarding gold foil with positively charged particles and noting that some
       particles were widely deflected?
        (A) Rutherford        (B) Dalton        (C) Chadwick        (D) Bohr

13.  The atomic number of oxygen, 8, indicates that there are eight
        (A) protons in the nucleus of an oxygen atom            (B) oxygen nuclides
        (C) neutrons
outside the oxygen atom's nucleus         (D) energy levels in the oxygen atom's nucleus

14.  The nucleus of an atom has all of the following characteristics EXCEPT that it
        (A) is positively charged        (B) contains nearly all of the atom's mass
        (C) is very dense                  (D) contains nearly all of the atom's volume

15.  An electrically neutral atom of mercury (atomic number 80) has
        (A) 80 neutrons and 80 electrons            (B) 40 protons and 40 electrons
        (C) 80 protons and 80 neutrons              (D) 80 protons and 80 electrons

16.  Which of the following is NOT part of Dalton's atomic theory?
        (A) Atoms cannot be divided, created, or destroyed.       
        (B) The number of protons in an atom is its atomic number.
        (C) In chemical reactions, atoms are rearranged.
        (D) All matter is composed of extremely small particles called atoms.

17.  A prospector finds 39.39 grams of gold (atomic mass 196.9665 amu).  She has
        (A) 1.20 x 1023 atoms        (B) 2.30 x 1023 atoms        (C) 4.30 x 1023 atoms        (D) 6.02 x 1023 atoms

18.  The atomic theory proposed by Dalton
        (A) has been totally discarded           
        (B) has been expanded and modified
        (C) has been accepted unchanged to the present day
        (D) has been found to be false

19.  Phosphorus - 33 (atomic number 15) contains
        (A) 33 protons        (B) 18 neutrons        (C) 33 neutrons        (D) 18 protons

20.  An Avogadro's constant amount of any element is equivalent to
        (A) the atomic number of that element            (B) the mass number of that element
        (C) 6.022 x 1023 particles                              (D) 100 grams of that element

21.  If each atom of element D has 3 mass units and each atom of element E has 5 mass units, a chemical molecule
       composed of one atom each of D and E has
        (A) 15 mass units        (B) 2 mass units        (C) 35 mass units        (D) 8 mass units

22.  According to the law of conservation of mass, when sodium, hydrogen, and oxygen react to form a compound,
       the mass of the compound is ___ the sum of the masses of the individual elements.
        (A) equal to        (B) greater than        (C) less than        (D) either greater than or less than

23.  The mass of exactly 5 moles of cesium (atomic mass 132.9 amu) is
        (A) 664.5 grams        (B) 132.9 grams        (C) 6.022 x 1023 grams        (D) 5 grams

24.  A quantity of sodium (atomic mass 22.99 amu) contains 6.022 x 1023 atoms.  The mass of the sodium is
        (A) 6.022 x 1023 grams        (B) 3.88 grams        (C) 22.99 grams        (D) not determinable

25.  The mass of 2.50 moles of calcium atoms (atomic mass 40.08 amu) is approximately
        (A) 10.0 grams        (B) 42.5 grams        (C) 100. grams        (D) 250. grams

26.  The mass of exactly 1 mole of chromium (atomic mass 51.996 amu) is
        (A) 12 grams        (B) 198 grams        (C) 51.996 grams        (D) 6.022 x 1023 grams

27.  As the atomic masses of the elements in the periodic table increase, the number of atoms in 1 mole of each
       element
        (A) decreases        (B) increases        (C) remains the same        (D) becomes a negative number

28.  What is the number of moles of chemical units represented by 9.03 x 1024 units?
        (A) 1.50 moles        (B) 9.03 moles        (C) 10.0 moles        (D) 15.0 moles

29.  The behavior of cathode rays produced in a glass tube containing gas at low pressure led scientists to conclude
       that the rays
        (A) were not composed of matter                                (B) were composed of positively charged particles
        (C) were composed of negatively charged particles       (D) were composed of uncharged particles

30.  In Rutherford's experiments, most of the particles
        (A) bounced back                            (B) passed through the foil       
        (C) were absorbed by the foil           (D) combined with the foil

31. Most of the volume of an atom is occupied by the
        (A) nucleus        (B) nuclides        (C) electron cloud        (D) protons

32.  Zn-66 (atomic number 30) has
        (A) 30 neutrons        (B) 33 neutrons        (C) 36 neutrons        (D) 96 neutrons

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