EXPERIMENT 7

Question 1

what are the chief elements found in organic compounds? they have small amounts of?

Answer 1

Carbon, Hydrogen and oxygen. with small amoung of halogen, nitrogen, sulfur and phosphorous

Question 2

What is being collected in the upper and cooler portion of the test tube when heating a very small amount of dry egg albumin?

Answer 2

Water was collected in the upper and cooler portions

Question 3

what organic compounds are frequently inflammable and when heated they take fire or char?

Answer 3

Carbon

Question 4

in the heating of egg albumin the charring indicates the presence of ____________ while the formation of water indicates the presence of ___________.

Answer 4

Carbon and hydrogen

Question 5

they are organic compounds containing ________ and may evolve to ammonia upon being heated with soda lime.

Answer 5

nitrogen

Question 6

what is being mixed to nitrogen in order to form ammonia?

Answer 6

Soda lime together with the presence of heat

Question 7

in heating nitrogen with soda lime, what made the red litmus paper turn blue?

Answer 7

The presence of ammonium gas turned the paper blue

Question 8

loosely combined _______ after heating with sodium hydroxide forms sodium sulfide which gives a black precipitate with lead acetate.

Answer 8

Sulfur

Question 9

What is combined to sulfur to form Lead sulfide? what precipitate does it poses?

Answer 9

lead acetate and sodium sulfide creates lead sulfide, black precipitate

Question 10

formula of the black precipitate in the mixture of sulfur and sodium sulfide?

Answer 10

Lead (II) sulfide, PbS

Question 11

what is the equation in creating the lead (II) sulfide?

Answer 11

Pb(CH3COO)2+Na2S —-> PbS + CH3COONa

Question 12

what happens when phosphorous is oxidized?

Answer 12

phosphorous changes to phosphate

Question 13

what is being added to phosphorous to form ammonium phosphomolybdate?

Answer 13

1ml of cool concentrated nitric acid

Question 14

what indicates the presence of phosphorous?

Answer 14

the presence of yellow precipitate of ammonium-phospho-molybdate

Question 15

what is the equation in forming phosphorous?

Answer 15

3NH4^+ + 12MoO4^2- + PO4^3- + 24H^+ —–> (NH4)3PO4 . 12MoO3 +12H2O

Question 16

what color does the Copper chloride possess when heated?

Answer 16

Green flame

Question 17

Why is green flame present in the process of heating?

Answer 17

Due to the decomposition of copper chloride

Question 18

it is test of which to see that there is the presence of halogen in a certain chemical?

Answer 18

beilstein test

Question 19

the green flame indicates that there is the presence of?

Answer 19

halogens

Question 20

Urea chemical formula

Answer 20

NH2CONH2

Question 21

Lime soda chemical formula

Answer 21

CaHNaO2

Question 22

Lead Acetate

Answer 22

Pb(C2H3O2)2

Question 23

ammonium molybdate

Answer 23

(NH4)6Mo7O24

Question 24

Acetic Acid

Answer 24

CH3COOH

Question 25

Sodium hydroxide

Answer 25

NaOH

Question 26

nitric acid

Answer 26

HNO3

Question 27

Give the chemical equation in the formation of Lead (II) sulfide

Answer 27

Pb (CH3COO)2+Na2S —-> PbS +CH3COONa

Question 28

Give the chemical equation of the formation of ammonium-phospho-molybdate?

Answer 28

3NH4^+ 12MoO4^2- + PO4^3- + 24H^+ + ——> (NH4)PO4 . 12MoO3 +12 H2O