The Circulatory SystemAnatomy and PhysiologyThe Circulatory SystemCells, Bells!Blood Types and GeneticsNow I Know My WBCs You might remember that blood is a form of connective tissue (widely…
(Encyclopedia)
CE5
Esters
ester, any one of a group of organic compounds with general formula RCO2R′ (where R and R′ are alkyl groups or aryl groups) that are formed by the reaction between an…
(Encyclopedia) glycolglycolglīˈkōl [key], dihydric alcohol in which the two hydroxyl groups are bonded to different carbon atoms; the general formula for a glycol is (CH2)n(OH)2. The most important…
(Encyclopedia) mixture, in chemistry, a physical combination of two or more pure substances (i.e., elements or compounds). A mixture is distinguished from a compound, which is formed by the chemical…
(Encyclopedia) rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium…
(Encyclopedia) Raoult's lawRaoult's lawrä&oomacr;lzˈ [key] [for F. M. Raoult, a French physicist and chemist] states that the addition of solute to a liquid lessens the tendency for the liquid to…
(Encyclopedia) ultrasonics, study and application of the energy of sound waves vibrating at frequencies greater than 20,000 cycles per second, i.e., beyond the range of human hearing. The application…
WorldRuling Party Takes Elections in Zimbabwe (April 1): President Robert Mugabe's party, Zimbabwe African National Union-Patriotic Front (ZANU-PF), dominates parliamentary elections, taking 55 out…
(Encyclopedia) boiling point, temperature at which a substance changes its state from liquid to gas. A stricter definition of boiling point is the temperature at which the liquid and vapor (gas)…
(Encyclopedia) complex ion, charged molecular aggregate (see ion), consisting of a metallic atom or ion to which is attached one or more electron-donating molecules. In some complex ions, such as…
