Home

Home
Common Compounds
Exam Guide
FAQ
Features
Glossary
Construction Kits
Companion Notes
Just Ask Antoine!
Simulations
Slide Index
Toolbox
Tutorial Index

Companion Notes
Introduction
Measurement
Matter
Atoms & ions
Dalton's atomic theory
Dalton's postulates
Atoms in compounds
Atoms in reactions
Quiz
References and links
Compounds
Chemical change
The mole
Gases
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. 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:
1/16 times the mass of a hydrogen atom 1/8 times the mass of a hydrogen atom
8 times the mass of a hydrogen atom16 times the mass of a hydrogen atom
2. 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 always combine in a 1:35 ratio.
chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride
hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass.
one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction
3. 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 mass is conserved in chemical reactions
why elements are characterized by the mass of their atoms
4. 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 atom1/19 times the mass of a hydrogen atom
1/38 times the mass of a hydrogen atom38 times the mass of a hydrogen atom
5. Which of the following is not a postulate of Dalton's atomic theory?
chemical change is a rearrangement of atoms
atoms are not created or destroyed in chemical change
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

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.
Details


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