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The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory

1. Dalton viewed chemical change as:
a rearrangement of atomsa transfer of protons
a change of atoms from one type into anothercreation and destruction of atoms
a nuclear exchangea transfer of electrons
2. Which of the following is not a postulate of Dalton's atomic theory?
atoms combine in simple whole number ratios to form compounds
chemical change is a rearrangement of atoms
atoms are not created or destroyed in chemical change
atoms of a single element can have different masses
different elements have atoms of different masses
3. When elements react, their atoms combine in:
arbitrary proportions
1:1 ratios
a simple whole number ratio (unique for each pair of elements)
simple whole number ratios (more than one possible)
4. 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.
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
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.
5. Dalton suggested that atoms were indestructible and unchangeble to explain:
why compounds combine in fixed weight ratios in chemical reactions
why elements combine in fixed weight ratios to form compounds
why elements are characterized by the mass of their atoms
why mass is conserved in chemical reactions

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