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5 Written questions

5 Matching questions

  1. the astronaut and an equal amount of the planet would both annihilate
  2. Molecules are the smallest subdivision of matter that still retains chemical properties of a substance
  3. lead
  4. fluorine
  5. 18 amu
  1. a 19) Which has the greatest number of protons in its nucleus?
    A) gold.
    B) mercury.
    C) lead.
    D) silver.
  2. b 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.
  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 8) Which of these statements is true?
    A) A molecule is the smallest particle that exists.
    B) Chemical elements are made up of about 100 distinct molecules.
    C) Molecules form atoms that in turn determine chemical properties of a substance.
    D) Molecules are the smallest subdivision of matter that still retains chemical properties of a substance.
    E) None of these statements is true.
  5. e 23) If an astronaut landed on a planet made of antimatter, there would be an explosion and
    A) the planet would annihilate.
    B) an amount of planet matter equal to that of the astronaut would annihilate.
    C) the astronaut would annihilate.
    D) the astronaut and an equal amount of the planet would both annihilate.

5 Multiple choice questions

  1. 10) What makes an element distinct?
    A) the number of protons
    B) the number of neutrons
    C) the number of electrons
    D) the total mass of all the particles
    E) none of these
  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. 7) Which of these atoms has the most mass?
    A) hydrogen
    B) iron
    C) lead
    D) uranium
    E) All have the same mass.
  4. 21) Compared to the energy it takes to separate oxygen and hydrogen from water, the amount of energy given off when they recombine is
    A) slightly more.
    B) slightly less.
    C) much more.
    D) much less.
    E) the same.
  5. 4) Atoms heavier than helium were made by
    A) photosynthesis.
    B) thermonuclear fusion.
    C) radiant energy conversion.
    D) radioactivity.
    E) none of these

5 True/False questions

  1. uranium41) If one neutron is added to a helium nucleus, the result is
    A) hydrogen.
    B) boron.
    C) lithium.
    D) beryllium.
    E) helium.

          

  2. There are only about 100 different kinds of atoms that combine to form all substances23) If an astronaut landed on a planet made of antimatter, there would be an explosion and
    A) the planet would annihilate.
    B) an amount of planet matter equal to that of the astronaut would annihilate.
    C) the astronaut would annihilate.
    D) the astronaut and an equal amount of the planet would both annihilate.

          

  3. electrons31) The chemical properties of matter come mostly from its
    A) protons.
    B) electrons.
    C) neutrons.

          

  4. single breath25) Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, then we probably breathe one of those atoms with each
    A) single breath.
    B) day.
    C) month.
    D) ten years.
    E) It depends - some people still breathe a few of Caesar's atoms every day, while others wouldn't breathe one for an entire year.

          

  5. electrical force17) Solid matter is mostly empty space. The reason solids don't fall through one another is because
    A) atoms are constantly vibrating, even at absolute zero.
    B) of nuclear forces.
    C) of gravitational forces.
    D) of electrical forces.
    E) none of these

          

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