World of Chemistry

Chemistry 0010

Matter and Energy

    Topics you should learn:

  1. Physical states of matter

  2. Energy

  3. Classification of matter

  4. Chemical and physical properties of matter

Physical states of matter

After discussing the importance of measurements we now turn our attention to the two terms that form the title of this section, matter and energy.
Matter is the stuff our universe is made of. When we observe a sample of matter, it can be in any of three different physical states: solid, liquid, and gas.

For example, depending on the surrounding temperature and pressure, water can exist as:

Under more restricted temperature and pressure conditions, water can coexist:

Although the three different physical states of water are quite different in physical appearance, the chemical makeup of water is the same in all three states.


Read:
  • 3-1 - Physical states of matter (page 52)

[RETURN TO TOP OF PAGE]

MAILBOX Send Comments to Rosamaría Fong.

Energy

Unlike matter, energy is not something that you can hold in your hands. But energy is something an object has if the object is able to do work. An object can possess energy in two different ways, as kinetic energy and as potential energy.

Energy can be converted from one form to another.

kinetic energy < = > potential energy

The conversion of energy is governed by the Law of Conservation of Energy. Energy is conserved means that energy is not lost.
For example,


Read:
  • 3-5 - Energy (page 62)
  • 3-6 - Laws of Conservation (page 66)

[RETURN TO TOP OF PAGE]

MAILBOX Send Comments to Rosamaría Fong.

Classification of matter

MATTER
Substance
Mixtures
Elements
Compounds
Homogeneous
Heterogeneous


Read:
  • 3-2 - Composition and properties of matter
    (page 52)
[RETURN TO TOP OF PAGE]

Back to course content page

MAILBOX Send Comments to Rosamaría Fong.

Chemical and physical properties of matter

We identify samples of matter and distinguish them from one another by their properties. We group properties into two categories:

  1. Physical Properties

    • Malleability of a metal
    • Ductility of a metal
    • Hardness
    • boiling point
    • freezing point .......... etc ....

  2. Chemical Properties

    • Rusting of iron
    • Burning of propane
    • Digestion of food
    • An apple turning brown ........ etc ...

A process in which a sample of matter changes its physical appearance but not its basic composition is called a physical change. In a chemical change the sample of matter undergoes a chemical reaction to change into completely different materials.


Read:
  • 3-4 - Properties and changes of pure substances (page 59)
[RETURN TO TOP OF PAGE]

MAILBOX Send Comments to Rosamaría Fong.

Rosamaría Fong, Instructor of Chemistry,
British Columbia Institute of Technology, Burnaby, B.C. Canada.

Send Comments to Rosamaría Fong. MAILBOX

All contents copyrighted © 1996
Rosamaría Fong, Instructor of Chemistry
All Rights reserved

: Last updated on June 7, 1996