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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:
3/14 times the mass of a hydrogen atom14 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 combine in simple whole number ratios to form compounds
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
3. 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:
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.
chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride
hydrogen and chlorine atoms always combine in a 1:35 ratio.
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
4. Dalton based his relative atomic weight scale on:
5. 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

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