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5 Written questions

5 Matching questions

  1. Law of Conservation of Mass
  2. Average Atomic Mass
  3. Electrons
  4. J J Thompson
  5. Atomic Number
  1. a the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
  2. b the weighted average of the atomic masses of the naturally occurring isotopes of an element
  3. c The number of protons in the nucleus of an atom.
  4. d 1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
  5. e negatively charged particles found outside the nucleus

5 Multiple choice questions

  1. a mass of an atom expressed in relation to the defined standard of 12 amu (1 carbon atom)
  2. atom of an element that has a number of neutrons different from that of other atoms of the same element
  3. 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. the sum of the numbers of protons and neutrons in the nucleus of an atom
  5. the tiny, dense central portion of an atom, composed of protons and neutrons

5 True/False questions

  1. Nuclear Model of the atomatoms are balls of positively charged material with negative electrons scattered throught

          

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

          

  3. 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

          

  4. Law of Multiple Proportionsif two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers

          

  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