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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 change of atoms from one type into anothera transfer of electrons
a nuclear exchangea transfer of protons
a rearrangement of atomscreation and destruction 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:
hydrogen and chlorine atoms always combine in a 1:35 ratio.
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.
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride
3. Dalton said that elements are different distinguished from each other by:
the charge on their ionsthe shapes of their atoms
the density of their solid formsthe weights of their atoms
4. 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:
1/38 times the mass of a hydrogen atom1/19 times the mass of a hydrogen atom
38 times the mass of a hydrogen atom19 times the mass of a hydrogen atom
5. Which of the following is not a postulate of Dalton's atomic theory?
chemical change is a rearrangement of atoms
atoms are not created or destroyed in chemical change
atoms combine in simple whole number ratios to form compounds
atoms of a single element can have different masses
different elements have atoms of different masses

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