• Distinguish between pure substance and mixtures:
    • A pure substance has a definite set of characteristic properties (density, mp, bp), whereas a mixture exhibits properties that are a mixture of the properties of the substance they contain.
    • A pure substance is composed of one kind of particle, whereas mixtures contain more than one kind of particle.
  • Describe how one could use differences in characteristic properties to separate the components of a mixture.
  • Sketch particle diagrams that distinguish compounds, elements and mixtures.
  • Distinguish elements from compounds in terms of differences in their properties.
  • Cite the evidence that supports the belief that some pure substances are “compounded” of simpler particles in a definite ratio.
  • Cite evidence for Avogadro’s Hypothesis.  Use this with evidence from combining volumes to deduce the formulas of some compounds.
  • State features of Dalton’s model of the atom; use composition by mass data to account for the laws of definite and multiple proportions.




The Ring of Truth:

  1. Looking
  2. Change
  3. Mapping
  4. Clues
  5. Atoms
  6. Doubt

Gases & How They Combine
Option 1 Classifying Matter
Option 2 Classifying Matter
Homogeneous vs. Heterogeneous Mixtures
Mixtures & Compounds
Separating the Seemingly Inseparable
Fractional Distillation of Crude Oil
Percent Composition 
The Periodic Table
Dalton’s Atomic Theory

En français:

Le modèle atomique de Dalton
L’organisation de la matière

En español:

Elemento, Compuesto o Mezcla (Homogénea o Heterogénea)
El Modelo atómico de Dalton


Dalton’s Playhouse


Practice Classifying Matter
Element Quiz

The Mystery of Matter