Laboratory Studies in Elementary ChemistryAmerican Book Company, 1894 - 144 σελίδες |
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Laboratory Studies in Elementary Chemistry Le Roy C. (Le Roy Clark) Cooley Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2012 |
Laboratory Studies in Elementary Chemistry (1894) Le Roy Clark Cooley Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2008 |
Συχνά εμφανιζόμενοι όροι και φράσεις
acetate add drops ammonium carbonate ammonium hydroxide apparatus ascertain barium chloride boiling bottle Bunsen calcium calcium chloride carbon dioxide chemical change chromium Cl₂ cold color contains copper cork crystals cubic centimeters decide delivery tube dilute solution dissolve drop by drop evaporate explain the reaction ferrous filter flame note foregoing experiments funnel give reason glass tube H₂ HNO3 hydrochloric acid hydrogen ignition tube inches invert iodide iron limewater liquid litmus paper magnesium manganous Manipulation and Notes mercuric chloride metals mixture mouth mutual action NH4Cl NH4OH nitric acid nitrogen Object obtained oxide oxygen piece porcelain dish potassium chromate potassium hydroxide precipitate proceed rubber salt side-neck flask sodium carbonate sodium chloride SOL'Y solid solu strong solution study the reaction substance sulphate sulphuric acid test tube tion water pan wire Write and explain Write the reaction zinc
Δημοφιλή αποσπάσματα
Σελίδα 63 - ... volume of air changes with heat. With the hole open, the air in the tube soon comes to be just as warm and just as much pressed as the air outside. Whenever a gas of any kind is to be measured its temperature and pressure must be the same as those of the air outside. THE ABSORPTION. — I now press the pinch-cock p; a little stream of the liquid falls into t at once, and then drops follow, or, if the tube be slightly inclined, a slender stream will flow down its side. It will continue to enter...
Σελίδα 64 - ... cc Water to fill the tube from the first to second ring, . . '23.5 cc Hence the number of cc of air taken, .... 29.5 cc And the number of cc of nitrogen found, . . . 23.5 cc And the number of cc of oxygen found, . . . . 6.
Σελίδα 63 - I ¡ gas with my hand, and lift the tube bottom up, as shown at T in Fig. 14, making the level of the liquid the same in the tube and in the funnel. I then open the pinch-cock. Some of the liquid will run out of T. When the liquid stands at the same level in the tube and in the funnel', I close the cock and bring the tube down again. The almost black liquid in t has now taken out all the oxygen and . carbon dioxide from the tubeful of air, and left all the nitrogen. The Measuring. — I must measure...
Σελίδα 62 - I press the tube t up over the cork until the joint is air-tight, as seen in Fig. 13, and after a minute I put the rod s into the open hole of the cork. I have now imprisoned a tubeful of air ; none can get out, and no more can get in. I left the hole in the cork open, because if it were not open the pressure of the cork would crowd the air below, and there would be too much in the tube; and then, too, handling the tube warmed it, and the volume of air changes with heat. With the hole open, the air...
Σελίδα 61 - ... better. The rubber stopper, c, is so large that its small end will enter the tube only about a half-inch. It has two holes ; to close one I have a solid rod of glass, s ; for- the other, a glass tube reaching just a very little below the cork, as shown. A piece of thin rubber tubing, h, is cut about six inches long. There is a pinch-cock, p, by which its walls may be pinched so as to close it completely. F is a small glass funnel. The lower end of h I stretch over the tube in the cork c, and...
Σελίδα 64 - ... two numbers we can find what part of the air is nitrogen and what part is oxygen, for they help us to answer the following questions, in their order, as shown by an example below : How many cc of air were in the tube at first ? How many cc of nitrogen did this air yield ? How many cc of oxygen did the same air yield? Then what fractional part of the air is nitrogen ? What fractional part of the air is oxygen ? And how many cc nitrogen in 100 cc of air 1 How many cc of oxygen in 100 cc of air?
Σελίδα 138 - The cubic centimeter may ordinarily be used as the unit of capacity, or 1.ooo cubic centimeters equally one liter may be employed. The unit of weight is the Gram = 15.43+ Grains. The gram is the weight of one cubic centimeter of pure water at 4° C.
Σελίδα 61 - ... 11), to hold the air. A six-inch tube, | inch in diameter, will do ; an eight-inch tube of the same diameter is better. The rubber stopper, c, is so large that its small end will enter the tube only about a half-inch. It has two holes ; to close one I have a solid rod of glass, s ; for- the other, a glass tube reaching just a very little below the cork, as shown. A piece of thin rubber tubing, h, is cut about six inches long. There is a pinch-cock, p, by which its walls may be pinched so as to...
Σελίδα 61 - Chemistry for Beginners." We set out now to find how many cubic centimetres of nitrogen and how many of oxygen and carbon dioxide there are in 100 cc of air. To do this we will imprison a vesselful of air, and then run into it a liquid which will absorb both the oxygen and the carbon dioxide completely, and leave the nitrogen. We can then measure the nitrogen which is left, and we can find out how much there was of the other two by measuring the liquid...
Σελίδα 34 - Draw off from each by pressing the pinchcock until the bottom of the meniscus (the curved upper surface of the liquid) is exactly level with the zero mark on the burette.