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Chapter 4 Multiple Choice and Essay
Поширений: Cooper
  • 1. According to John Dalton's observations, when elements combine in a compound,
A) their volumes are always equal.
B) each element contributes an equal number of atoms.
C) the ratio of their masses is always the same.
D) their masses are always equal.
  • 2. Rutherford's gold foil experiment provided evidence for which of the following?
A) Alpha particles have a positive charge.
B) Negative and positive charges are spread evenly throughout an atom.
C) Gold is not as dense as previously thought.
D) There is a dense, positively charged mass in the center of an atom.
  • 3. In an atomic model that includes a nucleus, positive charge is
A) concentrated at multiple sites in an atom.
B) concentrated in the center of an atom.
C) spread evenly throughout an atom.
D) located in the space outside the nucleus.
  • 4. Which subatomic particle has a negative charge?
A) electron
B) proton
C) neutron
  • 5. Which statement about subatomic particles is true?
A) Neutrons have no charge and no mass.
B) Unlike protons or neutrons, electrons have no mass.
C) Protons, neutrons, and electrons all have about the same mass.
D) An electron has far less mass then either a proton or a neutron.
  • 6. Which of the following is unique for any given element?
A) the mass of the neutron
B) the charge on the electrons
C) the number of neutrons
D) the number of protons
  • 7. The number of protons in one atom of an element is the element's
A) charge
B) atomic number
C) isotope
D) mass number
  • 8. To find the number of neutrons in an atom, you would subtract
A) atomic number from mass number
B) isotope number from atomic number
C) atomic number from electron number
D) mass number from atomic number
  • 9. In Niels Bohr's model of the atom, electrons move
A) like beach balls on water waves.
B) like balls rolling down a hill.
C) like popcorn in a popper.
D) like planets orbiting the sun.
  • 10. What does the electron cloud model describe?
A) the number of electrons in an atom
B) the precise location of electrons in an atom
C) the mass of the electrons in the atom
D) the most likely locations of electrons in an atom
  • 11. Which statement about alkali metals is correct?
A) they form negative ions
B) they are usually gases
C) the are extremely nonreactive
D) they are located in the left-most column of the periodic table
  • 12. A mole is an SI base unit that describes the
A) electric charge of a substance
B) amount of a substance
C) volume of a substance
D) mass of a substance
  • 13. Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element?
A) isotope number
B) atomic number
C) atomic mass unit
D) mass number
  • 14. The tendency of an element to react chemically is closely related to
A) the ratio of protons to neutrons in atoms of the element
B) the number of valence electrons in atoms of the element
C) its atomic mass
D) how tightly atoms are packed in the element
  • 15. Which statement is true about oxygen-17 and oxygen-18?
A) They have the same mass number
B) they do not have the same number of protons
C) their masses are identical
D) They are isotopes of oxygen
  • 16. In a periodic table, a set of properties repeats from
A) column to column
B) group to group
C) row to row
D) element to element
  • 17. Which list of elements contains only metals?
A) iodine, iron, nickel
B) sodium, chromium, copper
C) helium, carbon, gold
D) phosphorus, nitrogen, oxygen
  • 18. The usefulness of Mendeleev's periodic table was confirmed by
A) the discovery of the nucleus.
B) the discovery of elements with predicted properties.
C) the discovery of subatomic particles.
D) the immediate acceptance by other scientists.
  • 19. An alkali metal has one valence electron, while an alkaline earth metal has
A) none
B) three
C) four
D) two
  • 20. As you move from left to right across a period, the number of valence electrons
A) decreases
B) stays the same
C) increases then decreases
D) increases
  • 21. The standard on which the atomic mass unit is based is the mass of a
A) proton
B) chlorine-35 atom
C) neutron
D) carbon-12 atom
  • 22. The charge on an electron is
A) +1
B) 0
C) -2
D) -1
  • 23. The relative mass of an electron is
A) 1/1840
B) 1/18
C) 0
D) 1
  • 24. Valence electrons determine an atom's
A) number of neutrons
B) chemical properties
C) mass
D) period
  • 25. Ionization refers to the process of
A) changing from one period to another
B) changing from lithium into fluorine
C) losing or gaining protons
D) losing or gaining electrons
  • 26. An atomic mass unit is equal to
A) one-half the mass of a hydrogen atom
B) one-fifteenth the mass of a nitrogen-15 atom
C) one-fourth the mass of a lithium atom
D) one-twelfth the mass of a carbon-12 atom
  • 27. Which statement about noble gases is correct?
A) they are highly reactive
B) they are rare in nature
C) they can form compounds with bright colors
D) They exist as single elements rather than molecules
  • 28. Semiconductors are elements that
A) have large atomic masses but small atomic numbers
B) are extremely hard
C) can conduct electric current only under certain conditions
D) do not form compounds
  • 29. Carbon and other nonmetals are found in which area of the periodic table?
A) on the bottom
B) on the left
C) in the middle
D) on the right
  • 30. Avogadro's constant in defined as the number of particles in
A) one mole of a pure substance
B) one liter of a pure substance
C) one kilogram of a pure substance.
D) one gram of a pure substance
  • 31. How many protons are in an atom of bromine?
A) 35
B) 79
C) 80
D) 172
  • 32. Explain how isotopes affect an element's average atomic mass.
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