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Topic: Alkali


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In the News (Wed 17 Apr 19)

  
  Alkali metal - Wikipedia, the free encyclopedia
The alkali metals are the series of elements in Group 1 (IUPAC style) of the periodic table (excluding hydrogen in all but one rare circumstance): lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
The alkali metals are silver-colored (caesium has a golden tinge), soft, low-density metals, which react readily with halogens to form ionic salts, and with water to form strongly alkaline (basic) hydroxides.
Alkali metals are famous for their vigorous reactions with water, and these reactions become increasingly violent as you move down the periods.
en.wikipedia.org /wiki/Alkali_metal   (510 words)

  
 alkali - Hutchinson encyclopedia article about alkali
The strength of an alkali is measured by its hydrogen-ion concentration, indicated by the pH value.
They may be divided into strong and weak alkalis: a strong alkali (for example, potassium hydroxide, KOH) ionizes completely when dissolved in water, whereas a weak alkali (for example, ammonium hydroxide, NH OH) exists in a partially ionized state in solution.
Alkalis react with acids to form a salt and water (neutralization).
encyclopedia.farlex.com /alkali   (369 words)

  
 MSN Encarta - Search Results - alkali
Alkalies (Arabic al-qili, “ashes of the saltwort plant”), originally the hydroxides and carbonates of potassium and sodium, leached from plant...
Alkali Metals, series of six chemical elements in group 1 (or Ia) of the periodic table (Periodic Law).
Alkali Weed, low, spreading plant with small white flowers, member of the morning-glory family.
ca.encarta.msn.com /alkali.html   (98 words)

  
 AllRefer - Species: Alkali Sacaton | Sporobolus airoides
Alkali sacaton occurs in all western states in the U.S. It is distributed from Missouri, Arkansas, and North Dakota to eastern Washington and south to California and Texas.
Alkali sacaton is 1 of the most commonly used species for seeding and stabilizing disturbed lands in the semiarid Southwest [2,4,25,55,60].
Alkali sacaton is notable for its tolerance to alkaline soil, drought, flooding, moderate grazing, and mining disturbance.
reference.allrefer.com /wildlife-plants-animals/plants/graminoid/spoair/all.html   (4177 words)

  
 Essay or Coursework : Alkali Metals.
The chemical elements that are identified as alkali metals are lithium, sodium, potassium, rubidium, caesium, and the extremely rare radioactive substance called francium.
The alkali metals are so called because they form alkalies--that is, strong bases capable of neutralizing acids--when they combine with other elements.
The alkali metals are the most chemically active of all metals, readily forming ions with a single positive electric charge.
www.coursework.info /i/62058.html   (301 words)

  
 Lesson Exchange: Introduction to Alkali Metals (Senior, Science)   (Site not responding. Last check: 2007-10-21)
Students will be able to see two of the alkali metals first hand with the teacher doing an experiment, while the students watch, on the slicing of a piece of sodium and also exposing a piece of potassium and sodium in water to show some of the chemical properties of this class of metals.
Teacher will ask questions about the alkali metals to students to see if students have been reading their textbook or have heard about them in other classes to get them interested in the topic and to see the general knowledge of the class from the start.
Students' understanding the concepts taught in class on the Alkali metals will be assessed during a short quiz at the end of the week pertaining to material taught in class and will again be later assessed during the unit test at the end of the unit.
www.teachers.net /lessons/posts/1718.html   (1422 words)

  
 Guidelines for the Use of Lithium to Mitigate or Prevent Alkali-Silica Reaction (ASR)
Thus, when considering imposing a limit on the alkali content for a given concrete mixture, consideration should be given to the aggregate type and reactivity, exposure conditions, and nature of the structure (i.e., design life or relative importance).
The total alkali content within a given concrete mixture may also be increased by the penetration of alkalies from external sources, such as seawater, ground water (containing sulfates), deicing salts, and brackish water.
The importance of the alkalies is that their presence in high concentrations in the pore solution results in an equally high concentration of OH ions (to maintain charge equilibrium).
www.tfhrc.gov /pavement/pccp/pubs/03047/02.htm   (6690 words)

  
 Chemical Elements.com - Alkali Metals   (Site not responding. Last check: 2007-10-21)
The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature.
As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity.
Alkali metals can explode if they are exposed to water.
www.chemicalelements.com /groups/alkali.html   (108 words)

  
 alkali. The Columbia Encyclopedia, Sixth Edition. 2001-05
Alkalies are readily soluble in water and form strongly basic solutions with a characteristic acrid taste.
Strong alkalies (e.g., those of sodium or potassium) are sometimes called caustic alkalies.
The term alkali originally applied to salts obtained from plant ashes and is sometimes applied to a carbonate of sodium or potassium or to the hydroxide of an alkaline-earth metal.
www.bartleby.com /65/al/alkali.html   (123 words)

  
 Alkali Flies
Alkali flies spend two of their three life stages entirely underwater.
The alkali fly was an important source of food for the Kutzadika’a people during the summer months.
The pupal stage of the alkali fly was collected in shallow water along the lakeshore.
www.monolake.org /naturalhistory/flies.htm   (449 words)

  
 Alkali Flat
Alkali Flat was originally developed in the 1850’s as a residential neighborhood comprised largely of wealthy families living in stately Victorian homes on large parcels of land.
Today, many of Alkali Flat’s Victorians are enjoying new life; some as family homes and others as law offices and even child care centers.
With an eye to the future and a commitment to the preservation of a proud past, this great downtown neighborhood is on the verge of revitalization and a community renaissance.
www.shra.org /Content/CommunityDevelopment/AlkaliFlat/AlkaliFlatTOC.htm   (212 words)

  
 Kids.net.au - Encyclopedia Alkali metal -   (Site not responding. Last check: 2007-10-21)
They are the elements in Group 1 of the Periodic Table - Lithium, Sodium, Potassium, Rubidium, Caesium and Francium.
The alkali metals are silvery colored, soft, low density metals, which react readily with halogens to form ionic salts, and with water to form strongly alkaline (basic) hydroxides.
Hydrogen, with a solitary electron, nominally belongs in the alkali metals group.
www.kidsseek.com /encyclopedia-wiki/gr/Group_1_element   (158 words)

  
 Alkali Silica Reactivity: What's New   (Site not responding. Last check: 2007-10-21)
Alkali - For purposes of evaluating ASR potential, term commonly refers to sodium and potassium occurring in constituents of concrete and mortar.
Alkali-Silica Reaction - Chemical reaction in either mortar or concrete between alkalis (hydroxyl ions associated with sodium and potassium) from portland cement and other constituents, such as admixtures and pozzolans, and certain siliceous rocks or minerals, such as opaline chert, strained quartz, and certain volcanic glasses, present as constituents of some aggregates.
It is not considered an alkali in cement and concrete terminology.
leadstates.transportation.org /asr/glossary.stm   (3581 words)

  
 The Open Door Web Site : Chemistry : The pH Scale
Alkalis are less well known but, in fact, you use an alkali every time you pick up a piece of soap.
Alkalis are just as corrosive as acids even though they feel smooth to the touch.
One alkali, ammonium hydroxide, is used in household cleaning fluids.
www.saburchill.com /chemistry/chapters/chap003.html   (418 words)

  
 The MSDS HyperGlossary: Alkali Metal
In their elemental forms, the alkali metals are all soft, ductile, malleable substances that can be easily cut with a knife or drawn into a wire.
Alkali metals are quite reactive towards air and water, with increasingly dangerous reactivity as one moves down the column from Li to Cs.
When working with alkali metals, be sure you have a fire extinguisher that is approved for Class D fires.
www.ilpi.com /msds/ref/alkalimetal.html   (640 words)

  
 A Basic Overview of Fuel Cell Technology
Today, the main electrolyte types are alkali, molten carbonate, phosphoric acid, proton exchange membrane (PEM) and solid oxide.
Alkali fuel cells operate on compressed hydrogen and oxygen.
Alkali cells were used in Apollo spacecraft to provide both electricity and drinking water.
americanhistory.si.edu /fuelcells/basics.htm   (1380 words)

  
 The hidden world of the alkali fly
The alkali fly, a research specialty of Dr. Dave Herbst, is an important indicator of Mono Lake’s health, but lack of funding has limited recent data collection and analysis.
Surrounded by the jagged peaks of the Sierra, Mono is a nestled gem of alkali flies, birds, brine shrimp, and tufa.
In truth, the alkali fly is a charming creature and could not care less about humans.
www.monolake.org /newsletter/98winter/alkalifly.htm   (631 words)

  
 eMedicine - Milk-Alkali Syndrome : Article by R Hal Scofield, MD
This syndrome was originally recognized in the 1920s during administration of the Sippy regimen, consisting of milk and bicarbonate, for treatment of peptic ulcer disease.
With the development of nonabsorbable alkali and histamine-2 blockers for treatment of peptic ulcer disease, milk-alkali syndrome became a rare cause of hypercalcemia; however, with increased use and promotion of calcium carbonate for dyspepsia and as calcium supplementation, a resurgence of milk-alkali syndrome has occurred in the last few years.
This cyclic pathophysiology maintains hypercalcemia and alkalosis as long as calcium and alkali are taken in by mouth.
www.emedicine.com /med/topic1477.htm   (3777 words)

  
 alkali on Encyclopedia.com
ALKALI [alkali] [Arab., al-gili =ashes of saltwort], hydroxide of an alkali metal.
A study of the influence of slag alkali level on the alkali-silica reactivity of slag concrete.
Toxic wastes at Alkali Lake pose headache for Oregon.
www.encyclopedia.com /html/a1/alkali.asp   (569 words)

  
 Alkali Incident   (Site not responding. Last check: 2007-10-21)
Lafarge has discovered that the alkali levels in its cement during this period were higher than the declared mean alkali levels used by concrete producers in creating their mix designs.
The true alkali data for the period was documented and has been made available.
However, in certain conditions, high levels of alkali have been linked to the development of damaging alkali silica reaction (ASR) to an extent that it causes the concrete to expand and crack.
www.cementindustry.co.uk /main.asp?page=272   (424 words)

  
 alkali   (Site not responding. Last check: 2007-10-21)
Concept: The alkali metals are soft and silvery.
Option: the ACS Video "Close-Up on Chemistry" includes a demo showing the properties of the alkali metals Li through Cs.
The reactivity of Rb and Cs is definitely shown to be greater than that of Li, Na, and K.
chemlearn.chem.indiana.edu /demos/Alkali.htm   (225 words)

  
 Alkali Metals
It is the first member of the Alkali Metal family.
Sodium is perhaps the most characteristic alkali metal, reacting violently with water and rapidly with the oxygen in air.
Francium is the last of the known alkali metals and does not occur to any significant extent in nature.
www.3rd1000.com /elements/alkali.htm   (772 words)

  
 Alkali Metals
The world "alkali" comes from the Arabic "al qali", meaning "from ashes", because two highly important alkali metals, sodium and potassium, came from ashes.
Remember that the alkali metals have one extra electron and therefore react strongly with atoms or molecules that need electrons to fill their outer shells.
This alkali metal is named for the Latin "coesius", which means "sky blue", because of its spectral emission lines.
borntoexplore.org /chemistry/alkali_metals.htm   (1426 words)

  
 Alkali, Zaynab - Profiles   (Site not responding. Last check: 2007-10-21)
ALKALI, Zaynab (1950-), Nigerian novelist, was born in Biu, Nigeria, gained undergraduate and graduate degrees in English at Bayero University, Kano, and has taught English and African literature at Bayero University and the University of Maiduguri.
Alkali's novels include The Stillborn (1984), which won the Association of Nigerian Authors award for prose fiction in 1985, and The Virtuous Woman (1987).
The assault on patriarchy, however, is incomplete: the characters remain determined by institutionalized patriarchy.
people.africadatabase.org /en/profile/15825.html   (309 words)

  
 Olin Chlor Alkali Products
Today, the plant produces chlorine, caustic soda, hydrogen, sodium hypochlorite, hydrochloric acid, and dilute sulfuric acid.
From its location on the Niagara River, the plant can take advantage of the area's abundance of low cost hydroelectric power-a distinct advantage considering that the facility has an average yearly power consumption equivalent to about 95,000 homes.
At Olin Chlor Alkali Products, we're not only committed to producing high quality products that help improve our quality of life, but we're committed to being a vital part of our community---to being a good neighbor.
www.olinchloralkali.com /loc_niagara.asp   (1159 words)

  
 Alkali Flat | New Mexico Hikes
Preview: The Alkali Flat Trail leads through the heart of the dunes at White Sands National Monument.
The dunes are large, closely spaced, and move with every wind storm, allowing little vegetation to survive.
Alkali Flat Trail brochure; Heart of the Sands 7.5-minute USGS quad.
www.trails.com /tcatalog_trail.asp?trailid=HGS122-072   (194 words)

  
 Alkali vs Acid   (Site not responding. Last check: 2007-10-21)
Lithium through cesium (francium too, but it's so short-lived nobody does much chemistry with it) are called "alkali" metals because they make strong bases when you throw them in water.
Beryllium through radium are the alkaline earths, as they also make strong bases when contacted with water, but the resulting materials aren't particularly soluble.
Even the so-called "alkali" and "alkaline earth" metals.
www.newton.dep.anl.gov /askasci/chem00/chem00670.htm   (220 words)

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