Sentence Examples


  • Nicotine may be recognized by the addition of a drop of 30% formaldehyde, the mixture being allowed to stand for one hour and the solid residue then moistened by a drop of concentrated sulphruic acid, when an intense rose-red colour is produced (I.
  • The original hypothesis of Baeyer suggested that the course of events is the following: the carbon dioxide is decomposed into carbon monoxide and oxygen, while water is simultaneously split up into hydrogen and oxygen; the hydrogen and the carbon monoxide unite to form formaldehyde and the oxygen is exhaled.
  • The formation of formaldehyde has till recently not been satisfactorily proved, though it has been obtained from certain leaves by distillation.
  • Recent investigations have confirmed Baeyers view of the formation of formaldehyde, but a different explanation has been recently advanced.
  • The first chemical change suggested is an interaction between carbon dioxide and water, under the influence of light acting through chlorophyll, which leads to the simultaneous formation of formaldehyde and hydrogen peroxide.

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