Laboratory Manual: Arranged to Accompany the 2d Ed. of "A Course in General Chemistry"Ginn, 1921 - 280 σελίδες |
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Σελίδα 4
... made to simmer , but should not be made to boil violently ( why ? ) . Withdraw the heat as soon as the water is evapo- rated . Note the residue left . Convince yourself that it is salt . FIG . 8 6. The metric system . a . Length . By [ 4 ]
... made to simmer , but should not be made to boil violently ( why ? ) . Withdraw the heat as soon as the water is evapo- rated . Note the residue left . Convince yourself that it is salt . FIG . 8 6. The metric system . a . Length . By [ 4 ]
Σελίδα 21
... boiling point of water for at least fifteen minutes , when it may be assumed that the air in the flask is also at that temperature ( T ) . Press a finger tip firmly against the end of the tube , quickly lift the flask from the bath ...
... boiling point of water for at least fifteen minutes , when it may be assumed that the air in the flask is also at that temperature ( T ) . Press a finger tip firmly against the end of the tube , quickly lift the flask from the bath ...
Σελίδα 24
... boil till 100 cc . or more of liquid has collected in E , the receiver . Com- pare the distillate ( dis- tilled water ) with the hydrant water in ap- pearance and taste . To what is the differ- ence due ? Interrupt the process of ...
... boil till 100 cc . or more of liquid has collected in E , the receiver . Com- pare the distillate ( dis- tilled water ) with the hydrant water in ap- pearance and taste . To what is the differ- ence due ? Interrupt the process of ...
Σελίδα 29
... Boil a moment or two and then allow the precipitate to settle . Pour off the water , wash the pre- cipitate once with hot water , and then add the solution of hydrogen peroxide . What change do you note in the color of the precipitate ...
... Boil a moment or two and then allow the precipitate to settle . Pour off the water , wash the pre- cipitate once with hot water , and then add the solution of hydrogen peroxide . What change do you note in the color of the precipitate ...
Σελίδα 30
... boiling , try increas- ing the heat . Is the boiling any more energetic ? Does the temperature rise any ? How do you define the boiling point ? 42. Freezing point ; melting point . a . Powder about 3 g . of sulfur and place it in a ...
... boiling , try increas- ing the heat . Is the boiling any more energetic ? Does the temperature rise any ? How do you define the boiling point ? 42. Freezing point ; melting point . a . Powder about 3 g . of sulfur and place it in a ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
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.