Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search help
769 results
  1. NLM Digital Collections - A manual of chemistry : theoretical and practical, inorganic and organic, adapted to the ... 
    Publication: Chicago, : Chicago Medical Book Co., [1919?]
    resource.nlm.nih.gov/04511350R
    ... p. 20), metals are positive and non-metals negative. Ions.-The phenomena associated with elec- trolysis were carefully ... positive ions or kations, and (2) tests for negative ions or anions. Metallic salts result, as we have ...
  2. NLM Digital Collections - A guide in the study of chemistry 
    Publication: Staunton, Va. : McClure Compan, 1917
    resource.nlm.nih.gov/04520480R
    ... color is due to the formation of a negative ion (MnO4)- compare color of permanganate solutions.) If manganese ... the chromium has been changed from a compound negative ion (CrOi) to a simple positive ion (Cr). The ...
  3. NLM Digital Collections - The theory and application of colloidal behavior (Volume 2) 
    Publication: New York : McGraw-Hill Book Company, Inc., 1924
    resource.nlm.nih.gov/04830250RX2
    ... are constantly- flowing towards the active electrode. The negative ions flow from the corona to the passive electrode. ... to be equal to the number of the negative ions %N~. Let the corresponding mobilities of the ions ...
  4. NLM Digital Collections - Chemistry for dental students (Volume 2) 
    Publication: London : John Wiley & Sons, Inc., 1923
    resource.nlm.nih.gov/50910170RX2
    ... the acid molecule splits into the positive and negative ions, the positive hydrogen attaching itself to one carbon ... with metals and replaces the hydroxyl groups with negative ions when acted upon by strong acids. Upon oxidation, ...
  5. NLM Digital Collections - Colloid chemistry : Wisconsin lectures 
    Publication: New York : Chemical Catalog Company, 1924
    resource.nlm.nih.gov/04830630R
    ... of ions; the concentration of e.g. the negative ions decreasing and the concentration of the positive ions ... ions can diffuse through the membrane but the negative ions cannot and on the other side of the ...
  6. NLM Digital Collections - Pathogenic microörganisms : a practical manual for students, physicians and health officers 
    Publication: Philadelphia : Lea & Febiger, [1924]
    resource.nlm.nih.gov/11130430R
    ... parts-positive ions carrying a positive charge and negative ions carrying a negative charge of electricity. Example.-Normal ... water (H2O) contains both positive ions (H) and negative ions (OH) in equal amounts which neutralize each other. ...
  7. NLM Digital Collections - Chemistry and toxicology for nurses 
    Publication: Philadelphia : W.B. Saunders Company, 1918
    resource.nlm.nih.gov/04530040R
    ... AND NOMENCLATURE 20 trolysis, and the anions, or negative ions, are so called because they are attracted to ... dissociated electrically into positive ions, called cations, and negative ions, called anions. HC1, a binary acid, can be ...
  8. NLM Digital Collections - The principles of organic chemistry 
    Publication: New York : McGraw-Hill Book Company, Inc., 1922
    resource.nlm.nih.gov/04710900R
    ... radical of acetic acid, whereas CH3COO is the negative ion of this acid. 118 ORGANIC CHEMISTRY When arranged ... indicate that the copper is contained in the negative ion of the salt,—a conclusion which is in ...
  9. NLM Digital Collections - A text book of general physiology for colleges 
    Publication: New York : McGraw-Hill Book Company, 1923
    resource.nlm.nih.gov/06820360R
    ... slight alterations produce profound changes in physiological behavior. Negative ions are also of physiological significance. The chief anions ... catalysis. In addition to the several positive and negative ions that have been recognized as specifically influencing certain ...
  10. NLM Digital Collections - Experimental inorganic chemistry 
    Publication: New York : The Century Co., 1917
    resource.nlm.nih.gov/04520410R
    ... calcium chloride. This colloid is coagulated by the negative ion. Note the amount and time required in each ... chloric acid, and shake (?). What is the complex negative ion here formed [R 740]? Does it give a ...
first · previous · 1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · next · last