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5 Written Questions

5 Matching Questions

  1. Isotope
  2. Law of Conservation of Mass
  3. Quark
  4. Ernest Rutherford
  5. Molar mass
  1. a the mass in grams of 1 mol of a substance
  2. b the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
  3. c from 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
  4. d atom of an element that has a number of neutrons different from that of other atoms of the same element
  5. e smaller particles that make up protons and neutrons

5 Multiple Choice Questions

  1. a powerful force of attraction that binds protons and neutrons together in the nuleus
  2. the weighted average of the atomic masses of the naturally occurring isotopes of an element
  3. 1700s-1800s 1. elements are composed of tiny indivisible perticles called atoms 2. atoms of the same element are the same, and atoms of different elements are different 3. atoms can chemically combine in simple whole number ratiosto form compounds 4. chemical reactions occur when atoms are separated, joined or rearranged
  4. evacuated glass tube in which a stream of electrons emitted by a cathode strikes a fluorescent material, causing it to glow(used to discover the electron)
  5. confirmed the existence of the neutron

5 True/False Questions

  1. Nucleusthe tiny, dense central portion of an atom, composed of protons and neutrons


  2. Plum Pudding Model of the atomatoms are balls of positively charged material with negative electrons scattered throught


  3. Neutrona subatomic particle that has no charge and that is found in the nucleus of an atom


  4. Molethe smallest particle of an element that retains its identity in a chemical reaction


  5. Protonatom of an element that has a number of neutrons different from that of other atoms of the same element


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