We know now that fire and air are not elements because
a) Air cannot be seen
b) Air could put out a fire
c) Fire is not only hot but dry too
d) Fire requires oxygen and air has oxygen in it

What royal scientist used the 29th day of frozen vapor to encounter elements for mastering new culinary creations?

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)