5. Distinguish clearly between the following terms: oxidation, reduction, combustion, and kindling temperature.
6. Is oxidation always accompanied by reduction?
7. What is the source of heat in the lime light? What is the exact use of lime in this instrument?
8. In Fig. 12, why is it necessary to dry the hydrogen by means of the calcium chloride in the tube X?
9. At what pressure would the weight of 1 l. of hydrogen be equal to that of oxygen under standard conditions?
10. (a) What weight of hydrogen can be obtained from 150 g. of sulphuric acid? (b) What volume would this occupy under standard conditions? (c) The density of sulphuric acid is 1.84. What volume would the 150 g. of the acid occupy?
11. How many liters of hydrogen can be obtained from 50 cc. of sulphuric acid having a density of 1.84?
12. Suppose you wish to fill five liter bottles with hydrogen, the gas to be collected over water in your laboratory, how many cubic centimeters of sulphuric acid would be required?