Recent content by Moogie

ok sorry. did not know that

I know you two are debating a different point about whether liquids can burn but could someone address my point as it is my thread :) My point was about the autoignition temperature of ethanol and paper. Specifically my source says the ignition point of paper is below that of ethanol. If this...

Hi I'm just wondering how other life forms on different planets might be able to evolve. Some of my thoughts: 1) other life forms don't necessarily need oxygen do they? On this planet we use oxygen to generate energy through combustion. Other life forms could generate energy by i)...

Hi Can I resurrect this thread as I don't think i got a final answer that I understand. Can anyone confirm the ignition point of water and ethanol because my source says the ignition point of paper is 230 degrees C and ethanol is 450 degrees C. If this is so I don't understand why when you...

That's brilliant. You've been very helpul. I really appreciate it.

also, when the reverse reaction happens from carbonic acid to h2o and co2, what form does the CO2 take? Is it just gaseous carbon dioxide molecules interspersed with the water molecules?

I understand what you are saying about evaporation but when you are hoping to explain these concepts to children (which is my point in asking these questions), children need neat models and sequence of steps. Sorry if I am trying to make the chemistry too 'neat'

I think you are referring to a film but I've never seen it. I read that the ignition point of water is 230 degrees C and ethanol is 450 degrees C? This was on a reputable website (royal society chemistry)

Ok, that's fine. I got confused as someone said there was no gas in the water. Saturation is a term i probably use without really knowing what it means. What does it mean to say water is saturated with CO2? Does that mean as much carbon dioxide has dissolved as possible?

I can see i have worded that question very badly. I really don't know what i was thinking when i wrote that. what i meant to ask was this: you see the reaction between carbon dioxide and water as an equilibrium reaction to create carbonic acid: CO2 + H20 <=> H2CO3 Equilibrium means...

also why is the ignition temperature of paper dipped in water so much higher than paper dipped in ethanol. The boiling points of water and ethanol arent that much different (78 to 100) so if you put paper dipped in water and paper dipped in ehtanol in a bunsen flame both the water and ethanol...

ok, i see now why i was confused. I saw something where paper dipped in ethanol wasn't burning. But this was an ethanol and water mixture so that the paper wasn't burning because the water in the alcohol water mixture was evaporating keeping the paper below its ignition temperature So the...

alxm - we had a similar discussion about why wet paper doesn't burn but i wasn't sure what would happen with ethanol as this can evaporate as well as burn. I was wondering if it would burn first or evaporate. However I didn't say it had to evaporate first, someone else did so i was responding to...

Oh right. Why wouldn't liquid ethanol mix with gaseous oxygen?

So the ethanol would evaporate and not burn? Why does it do this?