EXP 7: Composition of Most Organic Compounds

Dry Egg Albumin (C6H8N2O4)

Carbon & Hydrogen: What was the substance being heated in the test tube?

Carbon; Hydrogen

Carbon & Hydrogen: The charring at the heated end indicated the presence of ___, while water vapor at the cooler end indicated the presence of ___.

Urea (NH2CONH2) & Soda Lime (NaOH & CaO)

Nitrogen: What was mixed then added to a test tube for heating?

NaOH & CaO

Nitrogen: Two components of soda lime

Blue

Nitrogen: What color did the litmus paper turn when placed above the heating solid?

Ammonia (NH3)

Nitrogen: What gas turned the litmus paper blue?

Dilute sodium hydroxide (NaOH) & small amount of egg albumin (C6H8N2O4)

Sulfur: What was first added to a test tube then heated?

Lead acetate (Pb(CH3COO)2)

Sulfur: After heating the NaOH with C6H8N2O4 what was added?

Black

Sulfur: What is the color of the precipitate formed after the Pb(CH3COO)2 is added?

Lead (II) sulfide (PbS)

Sulfur: What is the name and formula of the precipitae?

(CH3COO)2Pb + Na2S —> PbS + 2 CH3COONa

Sulfur: What is the balanced chemical equation for the reaction after Pb(CH3COO)2?

Albumin (C6H8N2O4) and concentrated nitric acid (HNO3)

Phosphorus: What is added to a test tube?

Clear Yellow

Phosphorus: What is the color of the solution after being heated?

Ammonium Molybdate ((NH4)2MoO4)

Phosphorus: What is added after the Albumin and HNO3 have been heated and cooled?

Yellow; ammonium phosphomolybdate ((NH4)3PO4*12MoO3)

Phosphorus: What is the color and name/formula of the precipitate that results after the (NH4)2MoO4 is added?

3NH4+ + 12MoO42- + PO43- + 24 H+ —> (NH4)3PO4*12 MoO3 + 12 H2O

Phosphorus: What is the balanced chemical equation?

Green

Halogens: What was the color of the Cu wire flame while it was being heated?

Decomposition of copper halide

Halogens: What is responsible for the green frame color?

Beilstein Test

Halogens: What is the name of the test?