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5 Written questions

5 Matching questions

  1. Neutron
  2. Atom
  3. Average Atomic Mass
  4. Plum Pudding Model of the atom
  5. Law of Multiple Proportions
  1. a the weighted average of the atomic masses of the naturally occurring isotopes of an element
  2. b if 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
  3. c atoms are balls of positively charged material with negative electrons scattered throught
  4. d a subatomic particle that has no charge and that is found in the nucleus of an atom
  5. e the smallest particle of an element that retains its identity in a chemical reaction

5 Multiple choice questions

  1. 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
  2. the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
  3. the sum of the numbers of protons and neutrons in the nucleus of an atom
  4. the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
  5. negatively charged particles found outside the nucleus

5 True/False questions

  1. Relative Atomic Massthe weighted average of the atomic masses of the naturally occurring isotopes of an element

          

  2. James Chadwick1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.

          

  3. Atomic NumberThe number of protons in the nucleus of an atom.

          

  4. Quarksmaller particles that make up protons and neutrons

          

  5. Scanning Tunneling Microscopes(STM)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