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5 Written questions

5 Matching questions

  1. Proton
  2. Isotope
  3. Mole
  4. Avogadro's number
  5. Plum Pudding Model of the atom
  1. a atom of an element that has a number of neutrons different from that of other atoms of the same element
  2. b number of representative particles in a mole, 6.02 X 10^23
  3. c a subatomic particle that has a positive charge and that is found in the nucleus of an atom
  4. d the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
  5. e atoms are balls of positively charged material with negative electrons scattered throught

5 Multiple choice questions

  1. the weighted average of the atomic masses of the naturally occurring isotopes of an element
  2. Uses a needle-like probe to measure differences in voltage caused by electrons that leak, or tunnel, from the surface of the object being viewed
  3. a mass of an atom expressed in relation to the defined standard of 12 amu (1 carbon atom)
  4. the tiny, dense central portion of an atom, composed of protons and neutrons
  5. the mass in grams of 1 mol of a substance

5 True/False questions

  1. Law of Conservation of Massthe weighted average of the atomic masses of the naturally occurring isotopes of an element

          

  2. Law of Definite Proportionsthe fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound

          

  3. Gold Foil experimentnegatively charged particles found outside the nucleus

          

  4. Ernest Rutherfordfrom his gold foil expirments, he knew some substances give off + charged particles called alpha particles, most of the mass of an atom is in the nucleus, he reasoned that electrons in the atom are whirled around outside the nucleus, most of the atom is empty space

          

  5. Strong Nuclear Forcefrom his gold foil expirments, he knew some substances give off + charged particles called alpha particles, most of the mass of an atom is in the nucleus, he reasoned that electrons in the atom are whirled around outside the nucleus, most of the atom is empty space