Humboldt State University ® Department of Chemistry

Richard A. Paselk

Science 331
Fall 2004 Lecture/Activity Office: SA560a
Notes: 18 October Phone: x 5719
Home: 822-1116
e-mail: rap1


What is matter? Stuff. Has mass and occupies space.

Mass: The measure of quantity for matter. Mass is the property of matter resulting in its inertia and and attraction via gravity.

Matter has both physical properties and chemical properties. These are properties which do not depend on the quantity of substance and therefore they can be used to identify a substance (sometimes referred to as intensive properties).

States of Matter. Matter can exist in three states under earth-surface conditions:

A fourth state of matter commonly occurs under special conditions: a plasma. A plasma is an ionized fluid - can be contained by magnetic fields.


States of Matter and Changes of State

Matter can exist in three states (phases) under earth-surface conditions:

Liquid Nitrogen Demo-balloons, Pb bell, rubber tubing, scatter on floor, pour over hand etc.


Exercise-Changes of State in Water

A common form of matter exhibiting these states under lab conditions is water. Let's look at water starting in its solid state and observe its transitions. We'll use the following equipment:

So let's all melt some ice and observe what happens:

What can you say about what has happened? e.g.:

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© R A Paselk

Last modified 25 October 2004