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5 Written Questions

5 Matching Questions

  1. electrons
  2. ancient stars
  3. fluorine
  4. 18 amu
  5. electrical force
  1. a 31) The chemical properties of matter come mostly from its
    A) protons.
    B) electrons.
    C) neutrons.
  2. b 18) A force that determines the chemical properties of an atom is a(n)
    A) friction force.
    B) nuclear force.
    C) gravitational force.
    D) electrical force.
    E) none of these
  3. c 39) If two protons are added to an oxygen nucleus, the result is
    A) heavy oxygen.
    B) fluorine.
    C) neon.
    D) sodium.
    E) nitrogen.
  4. d 26) Nuclei of atoms that make up a newborn baby were made in
    A) the mother's womb.
    B) the food the mother eats before giving birth.
    C) ancient stars.
    D) the Earth.
    E) none of these
  5. e 36) What is the molecular mass of a water molecule?
    A) 10 amu
    B) 12 amu
    C) 15 amu
    D) 18 amu
    E) None of these. It depends on the temperature.

5 Multiple Choice Questions

  1. 33) In a closed bottle are a certain number of hydrogen molecules. In an identical closed bottle at the same temperature and internal pressure are a certain number of nitrogen molecules. The bottle with the greater number of molecules is the one containing
    A) hydrogen.
    B) nitrogen.
    C) both the same
  2. 22) When carbon and oxygen atoms combine, energy is
    A) taken in by the reaction.
    B) given off by the reaction.
    C) not involved.
  3. 32) Compared to the mass of a hydrogen atom, the mass of an oxygen atom is
    A) 8 times as great.
    B) 12 times as great.
    C) 16 times as great.
    D) appreciably more than 16 times as great.
  4. 14) In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of
    A) neutrons.
    B) quarks.
    C) orbital electrons.
    D) all of these
    E) none of these
  5. 7) Which of these atoms has the most mass?
    A) hydrogen
    B) iron
    C) lead
    D) uranium
    E) All have the same mass.

5 True/False Questions

  1. short-lived24) In our part of the universe, antimatter is
    A) non-existent.
    B) plentiful.
    C) short-lived.
    D) long-lived.


  2. air12) Which of the following is not a compound?
    A) air
    B) ammonia
    C) water
    D) salt
    E) All are compounds.


  3. lead1) How many different elements are in a water molecule?
    A) one
    B) two
    C) three
    D) four
    E) none


  4. the number of protons4) Atoms heavier than helium were made by
    A) photosynthesis.
    B) thermonuclear fusion.
    C) radiant energy conversion.
    D) radioactivity.
    E) none of these


  5. Molecules are the smallest subdivision of matter that still retains chemical properties of a substance9) Which of the following statements is true?
    A) An atom is the smallest particle known to exist.
    B) There are only about 100 different kinds of atoms that combine to form all substances.
    C) There are thousands of different kinds of atoms that account for a wide variety of substances.
    D) A large atom can be photographed with the aid of an ordinary microscope.
    E) None of these statements are true.


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