Essays Tagged: "chemical properties"

Gallium

ely match those predicted by Mendelev.Gallium, atomic number 31, is very similar to aluminum in its chemicalproperties. It does not dissolve in nitric acid because of the protective film ofgallium oxi ... le isotopes: gallium-69 ( 60.4 percent )and gallium-71 (39.6 percent ).Somewhat similar to aluminum chemically, gallium slowly oxidizes in moist airuntil a protective film forms, and it becomes passiv ...

(2 pages) 30 0 2.6 Dec/1997

Subjects: Science Essays > Chemistry

Chlorine

The Element: ChlorineGeneral InformationWe researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.4 ... orming a pale yellowish green solution. Chlorine is so reactive that it never occurs free in nature.Chemical PropertiesChlorine is in the halogen family, and like all the other halogen elements chlori ... re of industrial growth. In, 1975 chlorine productions ranked seventh on the list of largest-volume chemicals produced in the United States. The importance of chlorine has changed as new uses have bee ...

(5 pages) 71 0 3.0 Nov/1996

Subjects: Science Essays > Chemistry

Biology paper on Russia's risk.

ras. These labratories, which were once used for producing highly dangerous biological weapons. The chemical properties of already deadly viruses were altered to create even more dangerous viruses tha ...

(3 pages) 28 0 4.4 May/2003

Subjects: Science Essays > Biotechnology

Cystic Fibrosis

colon and other organs involved in the digestive process). Cystic fibrosis involves changes in the chemical properties of mucus, causing thicker-than-normal mucus that can lead to obstructions in the ...

(5 pages) 52 0 3.0 Apr/2004

Subjects: Humanities Essays > Health & Medicine > Diseases

What is radioactivity?

in turn, composed of quarks.IsotopesAll atoms with nuclei having the same number of protons form a chemical element. Having the same number of protons, they have the same number of electrons, hence t ...

(1 pages) 40 2 4.3 Jun/2004

Subjects: Science Essays > Chemistry

'Cliff profiles are created by many complex factors'-Discuss

erosional processes take a long time and are very complex. Lithology describes the mechanical and chemical properties of rocks. Rocks are a major factor that affects the profile of a cliff. Weatheri ...

(2 pages) 37 1 4.0 Oct/2004

Subjects: Science Essays > Earth Sciences > Geography

Atomic structure

ough, we have to clarify this statement. An atom cannot be broken down further without changing the chemical nature of the substance. For example, if you have 1 ton, 1 gram or 1 atom of oxygen, all of ... e can break down the atom of oxygen into smaller particles, however, when we do the atom looses its chemical properties. For example, if you have 100 watches, or one watch, they all behave like watche ...

(5 pages) 36 0 4.5 May/2005

Subjects: Science Essays > Chemistry

Radium. This essay describes, gives a history of, and gives properties of the element radium.

n, which is a process used to separate components from a mixture through differences in physical or chemical properties. In 1902, after refining several tons of pitchblende from North Bohemia, one-ten ... Brian. Uranium and Other Radioactive Elements. Danbury, CT: Atlantic EuropeCo., 1997.Newton, David. Chemical Elements. Detroit: U*X*L, 1999.Radium. Jan. 2001. Wikipedia. 1 Dec. 2004."Radium." The New ...

(4 pages) 32 0 4.7 Jun/2005

Subjects: Science Essays > Chemistry

Periodic Table.

tomic radii, ionization energy, and electronegativity. A Family is a group of elements with similar chemical properties, a vertical column in the periodic table of elements. A period is a sequence of ...

(2 pages) 19 0 0.0 Sep/2005

Subjects: Science Essays > Chemistry

Isotopes in Society: Xenon

iffers by the number of neutrons. Thus, they vary in physical properties, but all have very similar chemical properties, and electronic structure. The relative atomic mass of an element is configured ...

(4 pages) 29 0 4.2 Mar/2006

Subjects: Science Essays > Earth Sciences

The Periodic Table of Elements

The periodic table of elements is a method of displaying the chemical elements in a table. It was first devised in 1869 by the Russian chemist Dmitri Mendeleev. ... because new elements are being discovered and new theoretical models have been developed to explain chemical behavior. Various different layouts are possible, however, the most common forms are still ... an extremely useful framework to classify, systematize and compare all the many different forms of chemical behavior. Earlier attempts to list the elements had usually put them in order of atomic mas ...

(1 pages) 1505 1 2.0 Apr/2006

Subjects: Science Essays > Chemistry

Alkanes & Alkenes

erties:The chemistry of carbon compounds is called organic chemistry. There are millions of organic chemicals, but they can be divided into groups called homologous series. All members of a particular ... divided into groups called homologous series. All members of a particular series will have similar chemical properties and can be represented by a general formula.The alkane series is the simplest ho ...

(2 pages) 17 0 2.0 Jun/2006

Subjects: Science Essays > Chemistry

Ecology Levels Of Biological Organization

hese three subatomic particles make up an atom. An atom is the smallest unit of matter that has the chemical properties of a particular chemical element. In turn, elements are made up of atoms. One of ... the small building blocks from which larger molecules are made. Molecules are two or more elements chemically combined and a compound is two or more different elements chemically combined. Some of th ...

(2 pages) 5 0 0.0 Jun/2001

Subjects: Science Essays > Biology

The Obliteration Of The Rainforests

inds of rare and endangered species of insects, animals, and a variety of tropical plants that have chemical properties to help cure a multitude of diseases. Unfortunately, the rainforests are being d ... ere are at least 2,000 plants in the rainforests that have been identified as having anti-cancerous chemical properties. (Rainforest Resources/Facts 1) However, as the rainforest disappears, "so do ma ...

(3 pages) 9 0 0.0 Oct/2001

Subjects: Science Essays > Biology