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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 rearrangement of atomsa transfer of electrons
a nuclear exchangea transfer of protons
creation and destruction of atomsa change of atoms from one type into another
2. When elements react, their atoms combine in:
arbitrary proportions
a simple whole number ratio (unique for each pair of elements)
1:1 ratios
simple whole number ratios (more than one possible)
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:
8 times the mass of a hydrogen atom1/16 times the mass of a hydrogen atom
1/8 times the mass of a hydrogen atom16 times the mass of a hydrogen atom
4. Which of the following is not a postulate of Dalton's atomic theory?
atoms are not created or destroyed in chemical change
atoms combine in simple whole number ratios to form compounds
different elements have atoms of different masses
chemical change is a rearrangement of atoms
atoms of a single element can have different masses
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:
14/3 times the mass of a hydrogen atom 3 times the mass of a hydrogen atom
14 times the mass of a hydrogen atom3/14 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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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