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16. One gram of hydrogen is contained in how many grams of hydrogen (a) silicide H.Si, (B) phosphide H ̧P, (y) arsenide H,As, (8) antimonide H.Sb?

17. What volume of chlorine is required to convert 100 grams of antimony into the pentachloride?

18.

Sb+5Cl = SbCl ̧.

What volume is occupied by 10 grams of trimethyl-· stibene Sb (CH), at 300° C. ?

19. A cubic decimetre of antimony sulphide (A 4.62) is dissolved in hydrogen chloride, what volume of hydrogen sulphide at 30°C. and 800 m.m. is given off?

Sb2S ̧ + 6HCl = 2SbCl ̧ + 3H ̧S.

20. How much antimony is there in 15 litres of hydrogen antimonide (H,Sb) measured at 100o C.?

21. 10 litres of hydrogen sulphide at 15° C. are passed into a solution of antimony trichloride, how much antimony trisulphide precipitates?

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22. What volume of chlorine at 12° C. is required to convert 4.68 grams of bismuth trioxide into the pentoxide? Bi2O2+ 2H2O + 4Cl = 4HCl + Bi ̧ ̧.

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23. Find the percentage composition of bismuth nitrate (Bi3NO. 5H,O).

24. Find the percentage composition of tartar emetic 20 HK (SbO) O ̧ . H2O.

25. Schneider found 100 grams of bismuth trioxide to contain 89.655 grams of bismuth. Calculate the atomic weight of the element.

CHAPTER XXI.

THE GENERAL PROPERTIES OF THE METALS AND ALLOYS.

1. FIND the volume of 100 grams of (a) gold ▲ 19.3, (B) lead ▲ 11-4, (y) sodium ▲ 0·974.

2. Find the volume of 100 grams of (a) platinum ▲ 21.5, (B) silver ▲ 10-5, (y) magnesium ▲ 1·74.

3. What length of wire 2 m.m. in diameter can be drawn from a cubic decimetre of metal ?

4. Gold leaf can be obtained 200ʊʊʊ of an inch thick, what decimal of a m.m. is equal to this fraction of an inch? 5. Find the mass in kilograms of an iron (▲ 7·7) beam 12 feet long, 6 inches broad, and 9 inches deep.

6. A kilogram of copper (A 8.9), a kilogram of silver (A 10.5), and a kilogram of mercury (▲ 13·5) are placed in a vessel full of water. What volume of water overflows?

7. Find the value of 1000 square centimetres of gold (A 19.3) leaf, 0001 c.m. thick at 2s. 9d. a gram.

8. Gold (A 19.3) leaf can be obtained 1 m.m. thick, what would be the length of the side of a square of such leaf containing one grain of gold?

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9. Platinum (A 21.5) wire can be made 100 m.m. in diameter, how many grams would such a wire 21600 geographical miles in length weigh?

10. A steel wire 1 m.m. square will just carry 70 kilograms; how many tons will a rod of such steel one foot square sustain ?

11. An iron wire 1 m.m. square will resist a pull of 70 kilograms, how many tons will a rod one inch square carry?

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Find the mass of an iron (▲ 7·8) telegraph wire 2 m.m. in diameter and 16 kilometres long.

13. How many metres of wirem.m. in diameter can be made from one ounce Troy of platinum (A 21-5)? And at 40s. per ounce what is the price of the wire per foot?

14. A lead wire 1 m.m. square will just carry two kilograms. What is the length of an iron (A7-25) weight 20 c.m. square, which a leaden rod 1 c.m. square will just carry?

15. How many grams does a sheet of iron (A 7·8) 1 m. square and oo m.m. thick weigh?

16. Find the mass of a platinum (A 21.5) wire 1 d.m. long, and 0.25 m.m. in radius.

17. 112 kilograms of an alloy (A 8.784) of copper (▲ 9). and tin (A 7.32) consist of how many kilograms of copper and how many of tin?

18. A meteorite (▲ 7·5) contains 3 times its volume of hydrogen, how many times is the meteorite heavier than the hydrogen?

19. A cast iron (A7·25) cube, each edge of which is 1 d.m. in length, floats upon mercury (▲ 13-596) with one face horizontal. How far is the cube immersed in the

mercury?

OF THE METALS AND ALLOYS.

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20. An iron wire 2 m.m. in diameter will carry 250 kilos., a nickel wire of the same size will carry 375 kilos., and a similar wire of cobalt will carry 479 kilos. Find the diameter of a wire of each metal which will carry 1000 kilograms.

21. A glass tube 20 c.m. in length contains 121 grams of mercury (A 13.51), find its radius.

22. A spherical glass bulb is found to hold 509 52 grams of mercury (A 13.51), find its internal radius.

23.

When weighing with brass (A 8·4) weights in air, what weight is apparently lost by the weights per gram ?

24. Find the mass in tons of a square mile of coal (A 1.4) 30 feet thick.

25. How many tons of material (▲ 3) are raised from a coal-shaft 4 yards in diameter and 900 yards deep?

26. Gun-metal is composed of 10 parts of tin (A 7.3) and 90 parts of copper (A 8.9). Find the density of the alloy, supposing that its volume is equal to those of the two metals.

27.

Britannia metal consists of 9 parts of tin (A 7·3) and 1 part of antimony (▲ 6-8). If the volume remains unchanged after the fusion, find the density of the alloy.

28. An alloy of equal parts of platinum (A 21.5) and copper (A 9) is found to have the same colour and density (A 19.5) as gold. In alloying 100 volumes of the two metals, what contraction takes place?

L. C. A.

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CHAPTER XXII.

POTASSIUM. K = 39.1.

1. FIND the mass of a ball of potassium (▲ 0·86) 2 c.m. in diameter.

2. With what volume of oxygen do 10 grams of potassium combine to form the oxides (a) K2O, (ß) K ̧O̟,, (7) K,0 ̧, (8) K2O̟?

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3. Find the percentage composition of potassium, (a) hydrate HKO, (B) nitrate KNO,, (7) chlorate KCIO,.

4. What volume of carbon monoxide at 455° C. is given off during the separation of 100 grams of potassium?

5.

K ̧CO2+2C3CO + 2K.

How many spherical pellets of potassium (▲ 0·86) each half an inch in diameter are there in an ounce avoirdupois of the metal ?

6. A globule of potassium (A 0.86) 1 c.m. in diameter is thrown in small fragments into water, what volume of hydrogen at 15° C. is given off?

K+ H2O = HKO + H.

7. To make a kilogram of potassium hydrate how much (a) potassium carbonate and (B) calcium hydrate is required?

K ̧CO2+ H ̧Ca ̧ = CaCO ̧ + 2HKO.

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