This dependends on the specific reactants in the reaction.
gas
The gas is carbon dioxide.
gas
color change release gas release heat form a whole new substance precipitation
All burning reactions involve chemical reactions (chemical changes).
gas that is produced in most chemical reactions gas that is in sodas
Heat helps chemical reactions to take place. Light can also cause some chemical reactions to take place.
the sun don't form gas! As well as other stars, the sun was formed of a gas (hydrogen) cloud by gravitational instability. After its formation in their bowels nuclear reactions of synthesis proceed, helium and heavier chemical elements is as a result formed. As a result of these reactions a large quantity of energy is allocated and the stars are shone - burning itself the sun gives light to us! So, the Sun can change their chemical compound, but not form gas from nothing!
An explosion involve generally chemical reactions.
Heat is a form of energy. All chemical reactions need to have an energy of some sort. Fire is a chemical reaction. You can figure out the rest. na sooooooo!
4 useful chemical reactions are: fermentation, smelting combustion and electrolysis
By chemical reactions they form other compounds.