Common Compounds
Exam Guide
Construction Kits
Companion Notes
Just Ask Antoine!
Slide Index
Tutorial Index

Companion Notes
Atoms & ions
Dalton's atomic theory
Dalton's postulates
Atoms in compounds
Atoms in reactions
References and links
Chemical change
The mole
Energy & change
The quantum theory
Electrons in atoms
The periodic table

Home :Companion Notes :Atoms & ions :Dalton's atomic theoryPrint | Comment

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. Dalton said that elements are different distinguished from each other by:
the shapes of their atomsthe weights of their atoms
the charge on their ionsthe density of their solid forms
2. 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:
16 times the mass of a hydrogen atom8 times the mass of a hydrogen atom
1/16 times the mass of a hydrogen atom 1/8 times the mass of a hydrogen atom
3. When elements react, their atoms combine in:
a simple whole number ratio (unique for each pair of elements)
simple whole number ratios (more than one possible)
1:1 ratios
arbitrary proportions
4. 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:
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass.
this is a simple mixture of elements because the ratio isn't a whole number ratio
chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride
hydrogen and chlorine atoms always combine in a 1:35 ratio.
5. Dalton viewed chemical change as:
creation and destruction of atomsa transfer of protons
a transfer of electronsa change of atoms from one type into another
a nuclear exchangea 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

Sign up for a free monthly
newsletter describing updates,
new features, and changes
on this site.

General Chemistry Online! Quiz

Copyright © 1997-2005 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 02/23/18.URL: http://antoine.frostburg.edu/chem/senese/101/atoms/dalton-quiz.shtml