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5 Written questions

5 Matching questions

  1. Law of Definite Proportions
  2. Molar mass
  3. Average Atomic Mass
  4. Nucleus
  5. Isotope
  1. a the 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
  2. b the weighted average of the atomic masses of the naturally occurring isotopes of an element
  3. c atom of an element that has a number of neutrons different from that of other atoms of the same element
  4. d the mass in grams of 1 mol of a substance
  5. e the tiny, dense central portion of an atom, composed of protons and neutrons

5 Multiple choice questions

  1. 1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
  2. a subatomic particle that has no charge and that is found in the nucleus of an atom
  3. created by Ernest Rutherford. Replaced the Plum Pudding Model. Atom is like a miniature solar system with the positive particles in the middle and the negative particles orbiting as the planets do around the center.
  4. The number of protons in the nucleus of an atom.
  5. the sum of the numbers of protons and neutrons in the nucleus of an atom

5 True/False questions

  1. Quarkthe amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12

          

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

          

  3. 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

          

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

          

  5. Protona subatomic particle that has a positive charge and that is found in the nucleus of an atom

          

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