Laboratory Manual: Arranged to Accompany the 2d Ed. of "A Course in General Chemistry"Ginn, 1921 - 280 σελίδες |
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Σελίδα 18
... presence of hydrogen with a lighted splint . Repeat , keeping the bottle mouth downward . Describe the results . Is the gas heavier or lighter than air ? d . Wash out the hydrogen generator , then remove the rub- ber delivery tube and ...
... presence of hydrogen with a lighted splint . Repeat , keeping the bottle mouth downward . Describe the results . Is the gas heavier or lighter than air ? d . Wash out the hydrogen generator , then remove the rub- ber delivery tube and ...
Σελίδα 19
... presence of what elements in this substance ? 27. Reduction . Arrange an apparatus according to Fig . 20 , in which a hard - glass tube C , about 30 cm . long and from 8 B C FIG . 20 to 10 mm . in diameter , is substituted for the glass ...
... presence of what elements in this substance ? 27. Reduction . Arrange an apparatus according to Fig . 20 , in which a hard - glass tube C , about 30 cm . long and from 8 B C FIG . 20 to 10 mm . in diameter , is substituted for the glass ...
Σελίδα 26
... presence of water in the crystals ? Examine the residue . How does it differ from the original crystals in appearance and in composition ? b . Select some small crystals of copper sulfate . Are they dry ? Fill a test tube one fourth ...
... presence of water in the crystals ? Examine the residue . How does it differ from the original crystals in appearance and in composition ? b . Select some small crystals of copper sulfate . Are they dry ? Fill a test tube one fourth ...
Σελίδα 37
... heavier or lighter than air . Attempt to pour it from one bottle to another , as you would a liquid , and test with a burning splint for its presence in the second bottle . c . Half fill a small beaker with limewater and [ 37 ]
... heavier or lighter than air . Attempt to pour it from one bottle to another , as you would a liquid , and test with a burning splint for its presence in the second bottle . c . Half fill a small beaker with limewater and [ 37 ]
Σελίδα 38
... presence of carbon dioxide in the air exhaled from the lungs ( R ) . Hold a wide - mouthed bottle above a small flame so that the hot gase- ous products of combustion will collect in it ; then quickly add a few cubic centimeters of ...
... presence of carbon dioxide in the air exhaled from the lungs ( R ) . Hold a wide - mouthed bottle above a small flame so that the hot gase- ous products of combustion will collect in it ; then quickly add a few cubic centimeters of ...
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acetate add a little aluminium ammonia ammonium hydroxide ammonium sulfide antimony Arrange an apparatus barium beaker boiling bottle bromide Bunsen flame burner calcium carbon dioxide charcoal chloric acid compounds concentrated sulfuric acid cool copper sulfate cork crucible crystals delivery tube dilute solution dish Dissolve distillate drops evaporate evaporating-dish ferric filter paper filtrate flask gentle heat glass rod glass tube hood hydro hydrochloric acid hydrogen chloride hydrogen sulfide insert iodide iron laboratory limewater liquid liter litmus paper magnesium mercuric metal mixture nitric acid Note the color Note the results obtained oxygen peroxide portion potassium chlorate powdered precipitate form Prepare reaction reagents Repeat the experiment residue rubber tubing screw clamp shake shown in Fig silver nitrate small piece sodium carbonate sodium hydroxide sodium sulfate solu soluble solution of hydrogen solution of sodium stopper sulfuric acid temperature test tube tion watch glass weight wire zinc
Δημοφιλή αποσπάσματα
Σελίδα 35 - Put one fourth of a test tube full of bone black into a small flask and pour over it about 50 cc. of water, to which has been added a few drops of a solution of litmus or of indigo.
Σελίδα 52 - ... 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 106 - ... in a solution of sodium hypochlorite. Note the results. Cut the tube containing the deposit so as just to remove the jet, and, inclining it, 0 FIG. 49 apply a gentle heat, as in b. Account for the results and write the equations for all the reactions involved in the experiment. 150. Arsenious oxide. Place a very little arsenious oxide in a test tube and add a few cubic centimeters of a solution of sodium hydroxide, heating the solution gently. Does the oxide dissolve (R) ? What do you infer as...
Σελίδα 71 - ... 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 95 - ... of water. What action takes place ? Test the reaction of the water with litmus paper. Holding the test tube in an inverted position (why?), remove it from the water and quickly ignite the gas at the mouth of the tube. How does the flame compare with that of burning ethylene and burning methane ? 6. 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. Is the bromine absorbed by the acetylene...
Σελίδα 103 - 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.