Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: INTRODUCTORY EXERCISES IN PHYSICS AND CHEMISTRY III.—Properties Op Phosphorus. Apparatus.—Piece of yellow phosphorus, evaporating dish, forceps, knife. Directions.—(Caution! Phosphorus should be kept under water and cut under water. It should not be allowed to come in contact with the bare skin.) Fill the evaporating dish with water and with the forceps place the piece of phosphorus in it. With the knife cut off a piece and examine the cut surface. Does it cut easily? Describe its consistency. What color is the new cut surface? Leave this exposed to the light for a time, keeping it under water, and note any change in color. Is phosphorus soluble in water? Pick up a piece with the forceps, wipe dry with filter or blotting paper, and hold in the air a moment. Describe what takes place. Why is phosphorus kept under water? Does phosphorus give off any odor? Rub phosphorus gently on a piece of paper and examine the paper afterwards in the dark. What evidence have you that phosphorus burns at a low temperature? (Bone is the part of the body richest in phosphorus.) Make a list of the properties of phosphorus so far as you have observed them. chapter{Section 4IV.—Properties Of Sulphur. Apparatus.—Half a teaspoonful of flowers of sulphur or a piece of stick sulphur, a silver spoon, a hard-boiled egg, a raw egg, an evaporating dish, alcohol lamp or Bunsen burner. Directions.—Examine a little of the sulphur. Has it any odor? taste? color? Shake some up in water. Does it dissolve? Place a little in the dry evaporating dish and heat gently. Does it melt? Describe its condition. Continue to heat and describe the various changes through which it passes. Touch a match to a little dry sulphur. Does it burn? Describe the result. Smell of the fumes (Caution!...