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. Elementary physics and chemistry: second stage. Science. io8 ELEMENTARY PHYSICS AND CHEMISTRY. Exercise XVII. 1. Write down all you know about phosphorus. 2. Describe carefully what occurs when phosphorus is burnt in an enclosed quantity of air. 3. How would you show that phosphorus will slowly take out the active part of the air without being lighted ? 4. How could you prove that air contains gases having different properties ? 5. In what way is the nrsting of iron similar to the slow burning of phosphorus ? 6. A piece of phosphorus is burnt in a stoppered bottle containing 100 c.c. of air.

. Elementary physics and chemistry: second stage. Science. io8 ELEMENTARY PHYSICS AND CHEMISTRY. Exercise XVII. 1. Write down all you know about phosphorus. 2. Describe carefully what occurs when phosphorus is burnt in an enclosed quantity of air. 3. How would you show that phosphorus will slowly take out the active part of the air without being lighted ? 4. How could you prove that air contains gases having different properties ? 5. In what way is the nrsting of iron similar to the slow burning of phosphorus ? 6. A piece of phosphorus is burnt in a stoppered bottle containing 100 c.c. of air. Stock Photo
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. Elementary physics and chemistry: second stage. Science. io8 ELEMENTARY PHYSICS AND CHEMISTRY. Exercise XVII. 1. Write down all you know about phosphorus. 2. Describe carefully what occurs when phosphorus is burnt in an enclosed quantity of air. 3. How would you show that phosphorus will slowly take out the active part of the air without being lighted ? 4. How could you prove that air contains gases having different properties ? 5. In what way is the nrsting of iron similar to the slow burning of phosphorus ? 6. A piece of phosphorus is burnt in a stoppered bottle containing 100 c.c. of air. The stopper of the bottle is then taken out under water. How many cubic cms. of water enter the bottle ? 7. Is the same proportion of air used up whether a large or a small piece of phosphorus is burnt in a stoppered bottle of air ? LESSON XVIII. CHANGES PRODUCED BY BURNING PHOSPHORUS IN AIR. PRACTICAL WORK.. Fir.. 5g.—Arrangement for collecting the white powder pro- duced by burning phosphorus. Things required.—Large test-tube, with well-fitting cork. Phosphorus. Litmus paper or blue litmus solution. Vinegar. Acids. Soda. Wire. Ap- paratus shown in Fig. 60. Taper. What to do. White powder prodticed when phosphorus biirtis.—Carefully dry a wide glass cylinder and a small crucible. Cut off (under water) a piece of phosphorus about half as big as a pea, and dry it between blotting paper or filter paper. Using a pair of tongs, place the phosphorus in the crucible, touch it with a hot wire, and quickly put the cylinder over it, as in Fig. 59. A white. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Gregory, R. A; Simmons, A. T. London: MacMillan