2010 On Line Technocracy Study Course project

Page 15
GO Bottom


Lesson 1

MATTER

The earth and everything upon it is composed of matter. Matter occurs in three principle physical states--solids, liquids, and gases. Examples of solids are rocks, wood, ice. Examples of liquids are water, gasoline, alcohol. Examples of gases are air, illuminating gas, water vapor or steam.

Molecules.
      The smallest particle of any pure substance, such as water, Iron or salt, which can exist without that substance changing it's physical properties is called a molecule.. Thus, water is made up of millions of water molecules, each of which is, so far as we know, exactly like every other water molecule. These water molecules are much too small to be seen by even the most powerful microscope. There are ways of measuring them quite accurately, however, as to weight and size.

Change of Physical State.
      Matter can be changed from one physical state to another. Thus, by the application of heat, water can be changed from itís solid state ice, to it's liquid state, water; and by further heating to it's gaseous state, water vapor. In a similar manner air, which is normally gaseous, by cooling and compression, can be converted into liquid air, and this by still further cooling, can be frozen solid.

Elements.
      There are compound substances and simple substances, or elements. Common salt, a compound substance, for instance, can be separated by electrical means into two substances--the metal element Sodium; and the poisonous gas element, Chlorine. Water, in like manner, can be resolved into two constituent gases, the elements Oxygen and Hydrogen. Marble, similarly, can be divided into the elements Carbon, Calcium, and Oxygen.


Page 16     GO Top Lesson 1 Bottom

      All of those last named substances are characterized by this fact, they cannot be further subdivided. They are called chemical elements. Chemical elements are the building materials of which everything else on earth is composed.

      There are only 92 chemical elements. Several of these are relatively common in everyday life. Among the better known elements are Iron, Aluminum, Copper, Tin, Lead, Zinc, Silver, Gold, Platinum, Oxygen, Carbon, Sulphur, Hydrogen, Nitrogen, Chlorine, Iodine, and Nickel.

      Some of the elements are exceedingly rare, and have been obtained only in extremely minute traces. Other elements are very common.

      Estimates based upon the averaging of thousands of chemical analysis show the upper 10 miles of the earth's crust to be composed of the following elements in approximately the percentages given.

Table 1

Chemical Composition of the Outer 10 miles of the Earth:
                                                Amounts in Percent
                                                by Weight
Oxygen . . . . . . . . . . . . . . . . . 46.59
Silicon . . . . . . . . . . . . . . . . . 27.72
Aluminum . . . . . . . . . . . . . . . 8.13
Iron . . . . . . . . . . . . . . . . . . . . . 5.01
Calcium . . . . . . . . . . . . . . . . . 3.63
Sodium . . . . . . . . . . . . . . . . . . 2.85
Potassium . . . . . . . . . . . . . . . 2.28
Magnesium . . . . . . . . . . . . . . 2.09
Titanium . . . . . . . . . . . . . . . . . 0.63
Phosphorus . . . . . . . . . . . . . . 0.13
Hydrogen . . . . . . . . . . . . . . . . 0.13
Manganese . . . . . . . . . . . . . . . 0.10
                                              --------
                                               99.29
All remaining 80 elements . . 0.71
                                            ----------
Total, 92 elements . . . . . . . 100.00

      The striking thing about this table is that by far the greater part of the materials comprising the surface of the earth is composed of only five or six chemical elements. Most of the familiar


Page 17     GO Top Lesson 1 Bottom

metals that are used daily occur in amounts of less than one-tenth of one percent of the surface rocks of the earth.

Atoms.
      The smallest particle of a chemical element is called an atom. A chemical compound is a substance of definite chemical composition, which is composed of two or more elements. Over 750,000different chemical compounds are known.

      Examples of chemical compounds are water, (Oxygen and Hydrogen abbreviated H2O), salt (Sodium and Chlorine abbreviated NaCl), and sugar, (Carbon, Hydrogen, Oxygen abbreviated C12H22O11).

      Most substances are not simple chemical compounds, but are rather mixtures or aggregates of various compounds. Wood, for instance, is composed of Carbon, Hydrogen, Oxygen, and a small amount of mineral matter. Wood, however, has not a definite chemical composition, and is not a single chemical compound. Likewise the air is a mixture chiefly of two gases, Oxygen and Nitrogen.

Chemical Changes.
      A chemical change involves a change of chemical composition. The grinding of wood into sawdust is a mechanical change which does not affect the chemical composition of the wood. Burning of wood, however, is a chemical change.

      The burning of wood consists in combining the Oxygen from the air with substances composing the wood. Without the added Oxygen, wood will not burn. After the wood is burned, if all the gases given off are collected and analyzed, it is found that they consist of Carbon dioxide and water vapor. A slight residue of mineral matter in the form of ash remains. Hence,

wood Oxygen   yields   water+CarbondiOxide+ash

      In a similar manner the burning of gasoline in an automobile results in water vapor and Carbon diOxide. This can be seen by watching the steam issue from the exhaust pipes on a cold day.

gasoline Oxygen   yields   watervapor+Carbon diOxide


Page 18     GO Top Lesson 1 Bottom

      When chemical elements combine in such a manner as to form more complex substances from simple ones the process is called combination. The reverse process of breaking more complex substances down to form simpler ones is called decomposition.

      Example of Combination:

4Fe+3O2   yields   2Fe2O2

Iron +Oxygen   yields   Iron oxide

      Example of Decomposition:

2H2O   yields   O2+2h2

water   yields   Oxygen+ Hydrogen

Indestructibility of Matter.
      In all chemical changes of whatever sort, it has been found that if all the materials are carefully weighed both before and after the change, while allowing nothing to escape in the meantime, the weight of the material taking part in the change before the reaction will be exactly equal to the weight of the products resulting from the reaction. This is true not only for the whole, but is also true for each individual element.

Summary.
      All events on the face of the earth involve in one way or another the movement or change in the relative configuration of matter. The rains and the flow of water, the winds, the growth of plants and animals, as well as the operation of automobile and factories are part of the movement of matter. Matter moves from one place to another, from one physical state to another, or from one chemical combination to another, but in all these processes the individual atoms are not destroyed; they are merely being continuously reshuffled.


GO Top

Go home page

Links to lessons

GO preface

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22