EXERCISES
1. How can you prove that the composition of the different allotropic forms of carbon is the same?
2. Are lampblack and bone black allotropic forms of carbon? Will equal amounts of heat be liberated in the combustion of 1 g. of each?
3. How could you judge of the relative purity of different forms of carbon?
4. Apart from its color, why should carbon be useful in the preparation of inks and paints?
5. Could asbestos fibers be used to replace the wire in a safety lamp?
6. Why do most acids decompose carbonates?
7. What effect would doubling the pressure have upon the solubility of carbon dioxide in water?
8. What compound would be formed by passing carbon dioxide into a solution of ammonium hydroxide? Write the equation.
9. Write equations for the preparation of K2CO3; of BaCO3; of MgCO3.
10. In what respects are carbonic and sulphurous acids similar?
11. Give three reasons why the reaction which takes place when a solution of calcium acid carbonate is heated, completes itself.
12. How could you distinguish between carbonates and sulphites?
13. How could you distinguish between oxygen, hydrogen, nitrogen, nitrous oxide, and carbon dioxide?
14. Could a solution of sodium hydroxide be substituted for the solution of calcium hydroxide in testing for carbon dioxide?
15. What weight of sodium hydroxide is necessary to neutralize the carbonic acid formed by the action of hydrochloric acid on 100 g. of calcium carbonate?
16. What weight of calcium carbonate would be necessary to prepare sufficient carbon dioxide to saturate 10 l. of water at 15° and under ordinary pressure?
17. On the supposition that calcium carbide costs 12 cents a kilogram, what would be the cost of an amount sufficient to generate 100 l. of acetylene measured at 20° and 740 mm.?
18. How would the volume of a definite amount of carbon monoxide compare with the volume of carbon dioxide formed by its combustion, the measurements being made under the same conditions?