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The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory


1. Dalton suggested that atoms were indestructible and unchangeble to explain:
why compounds combine in fixed weight ratios in chemical reactions
why mass is conserved in chemical reactions
why elements combine in fixed weight ratios to form compounds
why elements are characterized by the mass of their atoms
2. Hydrogen combines with nitrogen in a 3:14 weight ratio to form ammonia. If every molecule of ammonia contains three atoms of hydrogen and one atom of nitrogen, an atom of nitrogen must weigh:
3 times the mass of a hydrogen atom14 times the mass of a hydrogen atom
3/14 times the mass of a hydrogen atom14/3 times the mass of a hydrogen atom
3. Hydrogen combines with fluorine in a 1:19 weight ratio to form hydrogen fluoride. If every molecule of hydrogen fluoride contains one atom of hydrogen and one atom of fluorine, an atom of fluorine must weigh:
38 times the mass of a hydrogen atom1/19 times the mass of a hydrogen atom
19 times the mass of a hydrogen atom 1/38 times the mass of a hydrogen atom
4. Which of the following is not a postulate of Dalton's atomic theory?
atoms are not created or destroyed in chemical change
atoms of a single element can have different masses
chemical change is a rearrangement of atoms
different elements have atoms of different masses
atoms combine in simple whole number ratios to form compounds
5. Dalton based his relative atomic weight scale on:
heliumoxygenlithiumcarbonhydrogen

Dalton's Atomic Theory
Page 1: Introduction
Page 2: Dalton's assumptions Five steps forward and one step back.
Page 3: Atoms in compounds An "invisible hand" fixes atom ratios in compounds
Page 4: Atoms in reactions Dance of the atoms
Page 5: Learning check Take a quiz on Dalton's Atomic Theory
Page 6: References and resources

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General Chemistry Online! Quiz

Copyright © 1997-2005 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 07/25/05.URL: http://antoine.frostburg.edu/chem/senese/101/atoms/dalton-quiz.shtml