|Fall 2004||Lecture/Activity||Office: SA560a|
|Notes: 18 October||Phone: x 5719
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.
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.
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:
- Set up your bunsen burner, ring stand and wire screen as demonstrated by instructor.
- Light your burner and adjust the flame using the needle valve and air adjustments on the burner . Make sure the gas cock is fully open.
- Do not adjust the burner further during the experiment. You may turn the burner off and on at teh cock, as long as you always turn it fully on or off. This way we have a continuous, constant heat supply.
- Time all of the heating steps below.
- Fill beaker with ice, measure temperature and weigh.
- Melt partially, measure temperature. record times and temperatures
- Continue measuring temperature as ice is heated and melts. record times and temperatures
- When ice completely melted, weigh again.
- Note temperature change as liquid water is heated. record times and temperatures
- Note temperature as water boils.
- Hold a test tube containing ice above boiling water, NOT in steam, and observe what happens. record times and temperatures
- Stop boiling, weigh again.
What can you say about what has happened? e.g.:
© R A Paselk
Last modified 25 October 2004