Is heated up bleach dangerous?
I put my electric flattop oven on self cleaning. This heated up the top of the oven. I then bleached the flattop. The bleach steamed up and made it nearly impossible to breath. The entire room is now unenterable due to the fumes. It is not merely a typical bleach smell. I can't breath when I am inside and my eyes are on fire.
Is there something about heating up bleach that is particularly dangerous?
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Probably generated some chloramines by reaction between the hot bleach and proteins on the stove surfaces. There's no telling exactly which chloramines you created, as we have no idea what amines were on your stove top. However, these things can be quite nasty.
Open windows if possible, and leave home for several hours. Your eyes and lungs are giving you important warnings. Heed them.
Bleach contains sodium hypochlorite. The fumes being released are almost certainly chlorine, which as you have observed, is quite hazardous. Bleach usually contains strong warnings not to mix with any other cleaning chemical, as some of them will tend to rapidly decompose its active ingredient and release a lot of gaseous chlorine. I expect applying heat has a similar effect.
You are unlikely to have done yourself any serious harm as you're sitting there typing about it, but breathing any more of it is definitely to be avoided.
Bleach fumes are already unpleasant, and heating will inevitable:
cause any volatile compounds dissolved in a liquid to be more volatile - what's in it will be cooked out rapidly;
and
most any chemical reaction (including bleach degrading into gas, or reactions with contaminants) to proceed much faster (chemists describe the general relationship in the arrhenius equation, which is not linear, though not downright exponential) - whatever the bleach turns into, it turns into at a much faster rate.
The same applies to the aggressiveness of a liquid chemical upon contact - most corrosive substances will be much more than doubly corrosive at 60°C vs 30°C.
Never burn a cloth recently soaked with bleach. By recently I mean 2 days. Also place at least a 50 yd. distance from the fire. I must have inhaled the fumes. I was out for about 24 hours, headaches, low energy, nausea, slight fever, loss of appetite.
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