EXPERIMENT 7 Flashcards
what are the chief elements found in organic compounds? they have small amounts of?
Carbon, Hydrogen and oxygen. with small amoung of halogen, nitrogen, sulfur and phosphorous
What is being collected in the upper and cooler portion of the test tube when heating a very small amount of dry egg albumin?
Water was collected in the upper and cooler portions
what organic compounds are frequently inflammable and when heated they take fire or char?
Carbon
in the heating of egg albumin the charring indicates the presence of ____________ while the formation of water indicates the presence of ___________.
Carbon and hydrogen
they are organic compounds containing ________ and may evolve to ammonia upon being heated with soda lime.
nitrogen
what is being mixed to nitrogen in order to form ammonia?
Soda lime together with the presence of heat
in heating nitrogen with soda lime, what made the red litmus paper turn blue?
The presence of ammonium gas turned the paper blue
loosely combined _______ after heating with sodium hydroxide forms sodium sulfide which gives a black precipitate with lead acetate.
Sulfur
What is combined to sulfur to form Lead sulfide? what precipitate does it poses?
lead acetate and sodium sulfide creates lead sulfide, black precipitate
formula of the black precipitate in the mixture of sulfur and sodium sulfide?
Lead (II) sulfide, PbS
what is the equation in creating the lead (II) sulfide?
Pb(CH3COO)2+Na2S —-> PbS + CH3COONa
what happens when phosphorous is oxidized?
phosphorous changes to phosphate
what is being added to phosphorous to form ammonium phosphomolybdate?
1ml of cool concentrated nitric acid
what indicates the presence of phosphorous?
the presence of yellow precipitate of ammonium-phospho-molybdate
what is the equation in forming phosphorous?
3NH4^+ + 12MoO4^2- + PO4^3- + 24H^+ —–> (NH4)3PO4 . 12MoO3 +12H2O
