Follow the instructions in the MSDS.
stick your hand in fire, or a explosion
When anything is burned, it releases chemicals, because everything is "chemicals".
An explosion of a firework requires heat to ignite the chemicals within the firework. Once ignited, the explosion of the firework releases light, sound, and heat energy as the chemicals burn and react.
Gummy bears and burned special salt
If you hold it close enough, you can get burned by the explosion of gunpowder.
carbon
A fire, an explosion or splashing of dangerous chemicals.
The cause of an explosion is a violent chemical reaction with release of gas.
Water and Carbon dioxide?
Yes, it can, in particularly if it is burned.
more than 20 miles and you would still get burned
There are numerous negative effects mixing two chemicals can result in. There could be an explosion or a toxic gas created.