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Dalton's atomic theory: Page 1 2 3 4 5 6 Back Next

The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory


1. Dalton based his relative atomic weight scale on:
carbonlithiumoxygenhydrogenhelium
2. Which of the following is not a postulate of Dalton's atomic theory?
different elements have atoms of different masses
chemical change is a rearrangement of atoms
atoms combine in simple whole number ratios to form compounds
atoms are not created or destroyed in chemical change
atoms of a single element can have different masses
3. 1.008 grams of hydrogen combines with 35.453 g of chlorine to form 36.463 g of a pure compound (hydrogen chloride). Dalton's explanation for this experimental fact might be:
chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride
hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass.
this is a simple mixture of elements because the ratio isn't a whole number ratio
hydrogen and chlorine atoms always combine in a 1:35 ratio.
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
4. Dalton suggested that atoms were indestructible and unchangeble to explain:
why compounds combine in fixed weight ratios in chemical reactions
why elements are characterized by the mass of their atoms
why mass is conserved in chemical reactions
why elements combine in fixed weight ratios to form compounds
5. Dalton said that elements are different distinguished from each other by:
the weights of their atomsthe density of their solid forms
the charge on their ionsthe shapes of their atoms

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