Laboratory Manual: Arranged to Accompany "A Course in General Chemistry"Ginn, 1915 - 262 σελίδες |
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Αποτελέσματα 1 - 5 από τα 55.
Σελίδα 4
... gently . The tip of the flame should not quite touch the dish . The liquid may be 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 ...
... gently . The tip of the flame should not quite touch the dish . The liquid may be 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 ...
Σελίδα 6
... operations requiring the application of a strong heat to glass the heat must be applied gently at first ; also , the highly heated glass must be cooled slowly to anneal it properly . After the glass is scratched , take the tube in [ 6 ]
... operations requiring the application of a strong heat to glass the heat must be applied gently at first ; also , the highly heated glass must be cooled slowly to anneal it properly . After the glass is scratched , take the tube in [ 6 ]
Σελίδα 7
... gently pull the glass apart , at the same time exerting a slight pressure with the thumbs . Do not try to break the tubing as you would break a stick , for this will FIG . 9 FIG . 10 splinter the glass and will never give a square end ...
... gently pull the glass apart , at the same time exerting a slight pressure with the thumbs . Do not try to break the tubing as you would break a stick , for this will FIG . 9 FIG . 10 splinter the glass and will never give a square end ...
Σελίδα 8
... gentle pressure ( Fig . 12 ) . Reverse the posi- tion of the cork and cut through from the other end . Care must be ... gently pull the ends apart until the bore is of the desired size ( Fig . 13 , B ) . A glass jet may be formed by ...
... gentle pressure ( Fig . 12 ) . Reverse the posi- tion of the cork and cut through from the other end . Care must be ... gently pull the ends apart until the bore is of the desired size ( Fig . 13 , B ) . A glass jet may be formed by ...
Σελίδα 9
... gently in the tip of the flame as long as any changes are produced . Note all the changes . Is the product sweet ? Is it soluble in water ? Do any properties remain unchanged ? What grounds do you have for assuming that a chemical ...
... gently in the tip of the flame as long as any changes are produced . Note all the changes . Is the product sweet ? Is it soluble in water ? Do any properties remain unchanged ? What grounds do you have for assuming that a chemical ...
Άλλες εκδόσεις - Προβολή όλων
Laboratory Manual: Arranged to Accompany a Course in General Chemistry William Edwards Henderson Wi McPherson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2019 |
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.