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The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory


1. Dalton said that elements are different distinguished from each other by:
the shapes of their atomsthe charge on their ions
the weights of their atomsthe density of their solid forms
2. 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:
hydrogen and chlorine atoms always combine in a 1:35 ratio.
chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride
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 aren't created or destroyed in the process so the reactant mass is the same as the product mass.
3. Dalton viewed chemical change as:
a transfer of protonsa nuclear exchange
creation and destruction of atomsa transfer of electrons
a rearrangement of atomsa change of atoms from one type into another
4. Dalton based his relative atomic weight scale on:
oxygenhydrogenheliumlithiumcarbon
5. When elements react, their atoms combine in:
a simple whole number ratio (unique for each pair of elements)
1:1 ratios
triplets
simple whole number ratios (more than one possible)
pairs
arbitrary proportions

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