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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 density of their solid formsthe charge on their ions
the shapes of their atomsthe weights of their atoms
2. 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:
1/19 times the mass of a hydrogen atom 1/38 times the mass of a hydrogen atom
19 times the mass of a hydrogen atom38 times the mass of a hydrogen atom
3. Hydrogen combines with oxygen in a 1:8 weight ratio to form water. If every molecule of water contains two atoms of hydrogen and one atom of oxygen, an atom of oxygen must weigh:
1/8 times the mass of a hydrogen atom16 times the mass of a hydrogen atom
1/16 times the mass of a hydrogen atom8 times the mass of a hydrogen atom
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:
hydrogen and chlorine atoms always combine in a 1:35 ratio.
hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass.
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
5. 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:
3/14 times the mass of a hydrogen atom14/3 times the mass of a hydrogen atom
3 times the mass of a hydrogen atom14 times the mass of a hydrogen atom

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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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