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Dalton's atomic theory
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The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory

1. 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 atom1/16 times the mass of a hydrogen atom
16 times the mass of a hydrogen atom8 times the mass of a hydrogen atom
2. Dalton viewed chemical change as:
creation and destruction of atomsa rearrangement of atoms
a transfer of electronsa nuclear exchange
a change of atoms from one type into anothera transfer of protons
3. Dalton suggested that atoms were indestructible and unchangeble to explain:
why mass is conserved in chemical reactions
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
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:
19 times the mass of a hydrogen atom38 times the mass of a hydrogen atom
1/38 times the mass of a hydrogen atom1/19 times the mass of a hydrogen atom
5. Dalton based his relative atomic weight scale on:

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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Last Revised 02/23/18.URL: http://antoine.frostburg.edu/chem/senese/101/atoms/dalton-quiz.shtml