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barbiturate
barbiturate , any one of a group of drugs that act as depressants on the central nervous system . High doses depress both nerve and muscle activity and inhibit oxygen consumption in the tissues. In low doses barbiturates act as sedatives , i.e., they have a tranquilizing effect; increased doses ...
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anesthesia
anesthesia [Gr.,=insensibility], loss of sensation, especially that of pain , induced by drugs, especially as a means of facilitating safe surgical procedures. Early modern medical anesthesia dates to experiments with nitrous oxide (laughing gas) by Sir Humphry Davy of England and the dentist ...
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Na
Na symbol for the element sodium .
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sodium benzoate
sodium benzoate or benzoate of soda, chemical compound, C 6 H 5 CO 2 Na, colorless or white crystalline, aromatic compound; the sodium salt of benzoic acid . It is soluble in water and is used as a preservative in foods and beverages; because it is poisonous, the concentration is limited by la...
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sodium silicate
sodium silicate any one of several compounds containing sodium oxide, Na 2 O, and silica , Si 2 O, or a mixture of sodium silicates. Sodium ortho silicate is Na 4 SiO 4 (or 2Na 2 O·SiO 2 ); sodium meta silicate is Na 2 SiO 3 (or Na 2 O·SiO 2 ); sodium di silicate is Na 2 Si 2 O ...
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sodium nitrate
sodium nitrate chemical compound, NaNO 3 , a colorless, odorless crystalline compound that closely resembles potassium nitrate (saltpeter or niter) in appearance and chemical properties. It is soluble in water, alcohol, and liquid ammonia. Sodium nitrate is also called soda niter or Chile saltpeter...
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sodium
sodium a metallic chemical element; symbol Na [Lat. natrium ]; at. no. 11; at. wt. 22.98977; m.p. 97.81°C; b.p. 892.9°C; sp. gr. 0.971 at 20°C; valence +1. Sodium is a soft, silver-white metal. Extremely reactive chemically, it is one of the alkali metals in Group 1 of the periodic ...
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sodium hydroxide
sodium hydroxide chemical compound, NaOH, a white crystalline substance that readily absorbs carbon dioxide and moisture from the air. It is very soluble in water, alcohol, and glycerin. It is a caustic and a strong base (see acids and bases ). Commonly known as caustic soda, lye, or sodium hydr...
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bicarbonate
bicarbonate or hydrogen carbonate, chemical compound containing the bicarbonate radical, -HCO 3 . The most familiar of such compounds is sodium bicarbonate (baking soda). See carbonate .
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sodium carbonate
sodium carbonate chemical compound, Na 2 CO 3 , soluble in water and very slightly soluble in alcohol. Pure sodium carbonate is a white, odorless powder that absorbs moisture from the air, has an alkaline taste, and forms a strongly alkaline water solution. It is one of the most basic industrial ch...
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