1. Why should the match be lighted before turning on the gas? 2. Why must the methane be mixed with the air in the barrel before it is burned? 3. What i.s the color of the flame when the air inlet holes are closed? A. YELLOW B. BLUE 4. What is ‹observed when a crucible is held in a luminous flame? Why does a luminous flame cause this? 5. What is required to convert the cooler luminous flame to a hotter flame? Draw a diatom of the nor.luminous, three-zone flame, and label each region according to its relative temperature I.hottest, medium or coolest. Use your match or splint lighting test data as the basis for your decision. 6. What is the condensate that forms inside the beaker when it is held above the flame? Where does ii come from? a. b. 7. Why should cut glass or chipped p•1assware always be fire-polished before using for other purposes?