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CHEMISTRY

What does this prove? 375.

How do physical changes differ from chemical ones? 375. With what does analytical chemistry deal? 375. How many elements are there? 375.

What element  composes  about  one-fifth  of  the  atmosphere,  eight-ninths of pure water and nearly one-half of the earth's crust?

375.

What is the next most abundant element? 375. How was the term "organic chemistry" originally used? 375. What is now meant by this term? 375.

What substances are now classed under inorganic chemistry? 375. How may mixtures and chemical compounds be distinguished? 375. What is an atom? 376. How can we explain the existence of several compounds of the same

composition? 376. Who discovered oxygen? 376. Who founded the atomic theory? 376. Who discovered nitrogen in the atmosphere? 1353. Who is said to have held the first rank among chemists? 509. What are acids? 7. What do all acids contain? 7. What are the properties of nearly all acids? 7. What acid gives vinegar its sour taste? 7.

What acid is found in bitter almonds and in peach stones? 7. What is carbonic acid? 332-3.

What gives the sparkling appearance to soda waters? 333. What especially distinguishes an alkaline substance? 50. When alkalies and acids unite, what results? 50. What effect have alkalies and acids on each other? 50. What did early chemists call "vital air"? 1406. Why does a man not feel the weight of thirty thousand pounds that

the air presses upon him? 33. What are the principal elements in air? 33.

Do plants and animals breathe the same or different elements? 34. What is ozone? 1406-7. What is the lightest gas known? 903. What liquid contains all the elements needed on the human body?

1225.

What produces cream on milk? 1225. What are examples of complete foods? 690. What is opium? 1386.

What peculiar effect has hashish on the human system? 847. How does alcohol affect the system? 42.

How does nitro-glycerine compare with gunpowder in power? 1354. What is the process of distillation? 535. What causes fermentation? 656.

Who perfected the mode of mixing colors with oil? 643. What is the process of distillation of vegetable perfumes? 1452. How is soap made transparent? 1775. From what is bay rum made? 185. From what is plaster of paris made? 819. From what is isinglass made? 945. What is naphtha? 1300. What valuable medicine is made from the bark of the cinchona tree?

1576.

Is sulphur a mineral or vegetable compound? 1846. What is phosphorus? 1475. Who discovered it and when? 1475. What gas, when changed to a liquid, is used in the manufacture of ice?

64. What is the philosopher's stone? 41.

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