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The law of fixed composition

Portrait of John Dalton

Quiz: Dalton's Atomic Theory

1. 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
this is a simple mixture of elements because the ratio isn't a whole number ratio
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
2. Dalton suggested that atoms were indestructible and unchangeble to explain:
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
why mass is conserved in chemical reactions
3. Dalton based his relative atomic weight scale on:
4. When elements react, their atoms combine in:
arbitrary proportions
1:1 ratios
a simple whole number ratio (unique for each pair of elements)
simple whole number ratios (more than one possible)
5. Dalton viewed chemical change as:
a change of atoms from one type into anothercreation and destruction of atoms
a transfer of protonsa nuclear exchange
a rearrangement of atomsa transfer of electrons

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