Laboratory Manual: Arranged to Accompany "A Course in General Chemistry"Ginn, 1915 - 262 σελίδες |
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Σελίδα 1
... becomes luminous . Always use the non- luminous flame unless otherwise directed . B FIG . 1 b . Hold an iron wire in various parts of the flame to gain an idea as to the relative temperatures . Pass a piece of glazed paper transversely ...
... becomes luminous . Always use the non- luminous flame unless otherwise directed . B FIG . 1 b . Hold an iron wire in various parts of the flame to gain an idea as to the relative temperatures . Pass a piece of glazed paper transversely ...
Σελίδα 2
... becomes heated it may be supported by a test - tube holder ( Fig . 3 ) or by a band of paper circling the upper part of the tube ( Fig . 4 ) . The sudden formation of vapor at the bottom of the tube sometimes causes the contents of the ...
... becomes heated it may be supported by a test - tube holder ( Fig . 3 ) or by a band of paper circling the upper part of the tube ( Fig . 4 ) . The sudden formation of vapor at the bottom of the tube sometimes causes the contents of the ...
Σελίδα 14
... becomes of the oxygen ? What is the name of the product formed in each case ? 19. Separation of the compounds present in the residue left in the preparation of oxygen . Heat the tube containing the residue obtained in § 15 until no more ...
... becomes of the oxygen ? What is the name of the product formed in each case ? 19. Separation of the compounds present in the residue left in the preparation of oxygen . Heat the tube containing the residue obtained in § 15 until no more ...
Σελίδα 30
... becomes of them ? Why ? At what temperature do they move freely up through the liquid to the surface ? Do they get larger or smaller as they rise ? Why ? When the water is gently boiling , try increas- ing the heat . Is the boiling any ...
... becomes of them ? Why ? At what temperature do they move freely up through the liquid to the surface ? Do they get larger or smaller as they rise ? Why ? When the water is gently boiling , try increas- ing the heat . Is the boiling any ...
Σελίδα 36
... becomes too violent . Clamp the flask on a ring stand and apply a very gentle heat , moving the burner about with the hand . As soon as the action begins , withdraw the burner . After the air has been expelled from the apparatus fill ...
... becomes too violent . Clamp the flask on a ring stand and apply a very gentle heat , moving the burner about with the hand . As soon as the action begins , withdraw the burner . After the air has been expelled from the apparatus fill ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acetate add a little aluminium ammonia ammonium hydroxide ammonium sulfide antimony barium beaker boiling bottle bromide Bunsen flame burner calcium charcoal compounds cool copper sulfate cork crucible crystals delivery tube dish Dissolve distilled drops equal volume evaporate evaporating-dish evolved ferric filter paper filtrate flask gentle heat gently glass rod glass tube hood hydrochloric acid hydrogen chloride hydrogen sulfide insert iodide iron laboratory limewater liquid liter litmus paper magnesium manganese dioxide mercuric metal mixture nitric acid nitrogen Note the color note the result obtained oxide oxygen portion potassium chlorate powdered precipitate form Prepare reaction reagents Repeat the experiment residue rubber tube screw clamp shake shown in Fig side shelf silver nitrate small piece sodium carbonate sodium hydroxide sodium sulfate solu soluble solution of ammonium solution of sodium stopper sulfuric acid temperature test tube tion volume of hydrogen watch glass weight wire zinc
Δημοφιλή αποσπάσματα
Σελίδα 80 - Prove the presence of carbon dioxide in the air exhaled from the lungs by blowing through limewater (R). Hold a wide-mouthed bottle above a small flame so that the hot gaseous products of combustion will collect in it ; then quickly add a few cubic centimeters of limewater, cover the mouth of the bottle with the hand, and shake up the contents. What do the results prove? What are the sources of carbon dioxide in the air ? Does the percentage in the air increase ? Why ? e.
Σελίδα 70 - ... having drank a Flask of Florence at a Tavern, and thrown the empty Flask upon the Fire, he call'd for a Bason of Water to wash his Hands, and perceiving that the little Wine left in the Flask had filled up the Flask with Steam, he took the Flask by the Neck and plunged the Mouth of it under the Surface of the Water in the Bason, and the Water of the Bason was immediately driven up into the Flask by the Pressure of the Air.
Σελίδα 94 - Then add the precipitate together with about five times its weight of a mixture of equal parts of sodium carbonate and sulphur, and fuse over a Bunsen burner.
Σελίδα 60 - ... powdered brimstone in a test tube. Cover the mouth of the tube with the thumb and shake the contents gently until the sulfur is dissolved, adding more carbon disulfide if necessary. Pour the clear solution into a small beaker, cover it loosely with a filter paper, and set it aside in the hood.
Σελίδα 83 - Collect another test tube full of the gas, quickly pour into it about 1 cc. of bromine water, close the mouth of the tube with the thumb, and shake it vigorously.
Σελίδα 95 - Phosphorous acid. Pour into a test tube about 0.5 cc. of phosphorus trichloride (hood) and add a little water, a drop at a time. What gas is evolved (R) ? Finally, add about 5 cc. of water, pour the liquid into an evaporatingdish, and evaporate to a sirupy mass. Dilute this with a little water, transfer the solution to a test tube, and add a few drops of a solution of silver nitrate. Boil the resulting mixture. A black precipitate forms. Explain.