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The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory

1. Which of the following is not a postulate of Dalton's atomic theory?
atoms combine in simple whole number ratios to form compounds
different elements have atoms of different masses
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
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:
this is a simple mixture of elements because the ratio isn't a whole number ratio
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
hydrogen and chlorine atoms always combine in a 1:35 ratio.
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.
3. Dalton viewed chemical change as:
a nuclear exchangecreation and destruction of atoms
a transfer of electronsa change of atoms from one type into another
a rearrangement of atomsa transfer of protons
4. 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 atom3/14 times the mass of a hydrogen atom
14/3 times the mass of a hydrogen atom14 times the mass of a hydrogen atom
5. Dalton said that elements are different distinguished from each other by:
the charge on their ionsthe weights of their atoms
the density of their solid formsthe 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
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Last Revised 07/25/05.URL: http://antoine.frostburg.edu/chem/senese/101/atoms/dalton-quiz.shtml