Matter and Materials: Grade 7 - Pure Substances and Mixtures

1. demonstrate an understanding of the characteristics of mechanical mixtures (heterogeneous) and solutions (homogeneous) and describe these characteristics using a scientific model (the particle theory);
2. investigate properties of different kinds of mechanical mixtures and solutions that make them useful in manufacturing products for particular purposes;
3. identify human uses of mixtures and solutions in everyday life, and evaluate the environmental impact of some of these uses.

Site Name	Online	O.E.	Description
Antacid Tablet Race		1	Students will conduct an activity with antacid tablets to show how increasing surface area of a chemical increases its reaction rate.
Oil, Water, and Dirt		2	Students will conduct an activity to observe different methods of separating components of mixtures.
Paper Chromatography		2	Students will have the opportunity to explore the technique of chromatography and observe factors affecting solubility and rate of dissolving.
The pH Factor		2	Site devoted to explanation and exploration of pH Factor.
Solubility		2	Students will conduct an activity to determine whether all substances dissolve in water.
Solubility and Temperature		2	Students will conduct an activity to determine if temperature affects the amount of a solute that can be dissolved in a solution.
Solubility of a Gas and Temperature		2	Students will conduct an activity to determine if temperature affects solubility.
Temperature and Rate of a Chemical Reaction		2	Students will conduct an activity to determine if temperature affects the rate of a chemical reaction.
The Three Phases of Matter		1	Students will revisit properties of liquids and solids then conduct an activity to examine a material that has characteristics of each.
Atoms or Molecules?		1	Students will construct models or chemical reactions and observe how compounds and mixtures are formed.
Molecules on the Move		1	Students will conduct an activity to observe how temperature affects the movement of molecules in a liquid.
pH: Acids and Bases		2	Students will prepare samples of acids and bases and test them using pH indicator paper.
Separating Solids		2	Students will conduct an activity to demonstrate different methods of separating the components of a mixture.
Temperature		2	Students will conduct an activity to observe the effect of temperature on rate of dissolving.
How do the particles of solids, liquids and gases behave differently?		1	Explains particle theory and solution concentration.