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5 Written questions

5 Matching questions

  1. Dalton's Atomic Theory
  2. Law of Definite Proportions
  3. Atom
  4. Nucleus
  5. Law of Multiple Proportions
  1. a the tiny, dense central portion of an atom, composed of protons and neutrons
  2. b 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
  3. c 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
  4. d the smallest particle of an element that retains its identity in a chemical reaction
  5. e 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

5 Multiple choice questions

  1. confirmed the existence of the neutron
  2. negatively charged particles found outside the nucleus
  3. smaller particles that make up protons and neutrons
  4. number of representative particles in a mole, 6.02 X 10^23
  5. a subatomic particle that has no charge and that is found in the nucleus of an atom

5 True/False questions

  1. Mass numberThe number of protons in the nucleus of an atom.


  2. Gold Foil experimentConducted by Ernest Rutherford in which alpha particles that were shot at gold foil were deflected when they hit the positive center of gold atoms. The nucleus was discovered as a result of this experiment.


  3. Atomic Numberthe sum of the numbers of protons and neutrons in the nucleus of an atom


  4. Ernest Rutherforda subatomic particle that has no charge and that is found in the nucleus of an atom


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