Chapter 4 Test - Chemistry

46 Questions | Total Attempts: 573

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Chemistry Quizzes & Trivia

Questions and Answers
  • 1. 
    E.C. The approximate composition of naturally occurring magnesium is as follows: 79% magnesium-24, 10% magnesium-25, and 11% magnesium-26. Calculate the atomic mass of magnesium. Show your work.
  • 2. 
    Discuss the law of constant composition and Dalton's atomic theory.
  • 3. 
    Discuss the difference between atomic number, mass number, and average atomic mass.
  • 4. 
    Discuss the significance of Rutherford's findings regarding the atom's structure.
  • 5. 
    An element that is very reactive gas is most likely a member of the
    • A. 

      Alkali metals

    • B. 

      Noble gases

    • C. 

      Halogens

    • D. 

      Actinides

  • 6. 
    Which statement is true?
    • A. 

      Alkali metals are generally found in their uncombined form.

    • B. 

      Alkali metals are Group 1 elements.

    • C. 

      Alkali metals should be stored under water.

    • D. 

      Alkali metals are unreactive.

  • 7. 
    Which statement about the Periodic Table is NOT true?
    • A. 

      There are more metals than nonmetals.

    • B. 

      The metalloids are located in Groups 13 through 16.

    • C. 

      The elements at the far left of the table are nonmetals.

    • D. 

      Elements arearranged by increasing atomic number.

  • 8. 
    Which of the following is a true statement about elements?
    • A. 

      Every element occurs naturally.

    • B. 

      All elements are found in their uncombined form in nature.

    • C. 

      Each element has a unique atomic nature.

    • D. 

      All of the elements exist in approximately equal amounts.

  • 9. 
    Which of the following is NOT found on the Periodic Table?
    • A. 

      The atomic number of each element

    • B. 

      The symbol of each element

    • C. 

      The density of each element

    • D. 

      The atomic mass of each element

  • 10. 
    The element _____________ is a metalloid.
    • A. 

      Silicon, Si

    • B. 

      Carbon, C

    • C. 

      Lead, Pb

    • D. 

      Phosphorus, P

  • 11. 
    In his gold foil experiment, Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because
    • A. 

      Most of the particles passed straight through the foil.

    • B. 

      Some particles were slightly deflected.

    • C. 

      A few particles bounced back.

    • D. 

      All of the above

  • 12. 
    How many protons does an atom with an atomic number of 23 and a mass number of 51 have?
    • A. 

      23

    • B. 

      28

    • C. 

      51

    • D. 

      74

  • 13. 
    An atom has no overall charge if it contains equal numbers of
    • A. 

      Electrons and protons.

    • B. 

      Neutrons and protons.

    • C. 

      Neutrons and electrons.

    • D. 

      None of the above

  • 14. 
    Which statement about neutrons is true?
    • A. 

      Neutrons have a mass of 1 amu.

    • B. 

      Neutrons circle the nucleus of an atom.

    • C. 

      Neutrons are the only particles that make up the nucleus.

    • D. 

      Neutrons have a negative charge.

  • 15. 
    Which of the following determines the identity of an element?
    • A. 

      Atomic number

    • B. 

      Mass number

    • C. 

      Atomic mass

    • D. 

      Overall charge

  • 16. 
    Isotopes exist because atoms of the same element can have different numbers of
    • A. 

      Protons.

    • B. 

      Neutrons.

    • C. 

      Electrons.

    • D. 

      None of the above

  • 17. 
    In Thomson’s “plum-pudding” model of the atom, the plums represent
    • A. 

      Atoms.

    • B. 

      Protons.

    • C. 

      Neutrons.

    • D. 

      Electrons.

  • 18. 
    An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of
    • A. 

      39.

    • B. 

      158.

    • C. 

      197.

    • D. 

      276.

  • 19. 
    Which of the following has the LEAST mass?
    • A. 

      Nucleus

    • B. 

      Proton

    • C. 

      Neutron

    • D. 

      Electron

  • 20. 
    The isotope of uranium used in nuclear reactors, uranium-235, contains 92 protons. Another isotope, uranium-238, contains ____ electrons.
    • A. 

      92

    • B. 

      95

    • C. 

      143

    • D. 

      146

  • 21. 
    Thomson's model of the atom resembled
    • A. 

      Chocolate-chip ice cream.

    • B. 

      Gelatin.

    • C. 

      The solar system.

    • D. 

      A balloon.

  • 22. 
    Who performed an experiment proving the existence of an atomic nucleus?
    • A. 

      Thomson

    • B. 

      Dalton

    • C. 

      Democritus

    • D. 

      Rutherford

  • 23. 
    The current model of the atom suggests that
    • A. 

      Electron clouds surround the nucleus.

    • B. 

      Proton clouds surround the nucleus.

    • C. 

      Electrons travel in definite paths around the nucleus.

    • D. 

      The exact path of a moving electron can be predicted.

  • 24. 
    The size of atoms
    • A. 

      Are exactly the same.

    • B. 

      Vary widely.

    • C. 

      Vary only a little bit.

    • D. 

      Cannot be measured.

  • 25. 
    Atoms are composed of
    • A. 

      Electrons and neutrons.

    • B. 

      Protons and neutrons.

    • C. 

      Electrons, protons, and neutrons.

    • D. 

      Atomic mass units.

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