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Dalton's atomic theory: Page 1 2 3 4 5 6 Back Next

The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory


1. 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:
14 times the mass of a hydrogen atom3/14 times the mass of a hydrogen atom
3 times the mass of a hydrogen atom14/3 times the mass of a hydrogen atom
2. Which of the following is not a postulate of Dalton's atomic theory?
different elements have atoms of different masses
atoms of a single element can have different masses
atoms are not created or destroyed in chemical change
chemical change is a rearrangement of atoms
atoms combine in simple whole number ratios to form compounds
3. 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
4. When elements react, their atoms combine in:
triplets
pairs
1:1 ratios
a simple whole number ratio (unique for each pair of elements)
simple whole number ratios (more than one possible)
arbitrary proportions
5. Dalton viewed chemical change as:
a change of atoms from one type into anothera transfer of electrons
a nuclear exchangecreation and destruction of atoms
a transfer of protonsa rearrangement of 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
Comments & questions to fsenese@frostburg.edu
Last Revised 07/25/05.URL: http://antoine.frostburg.edu/chem/senese/101/atoms/dalton-quiz.shtml