Where does the energy given off by an exothermic reaction come from?

a. the chemicals make the energy during the reaction from atoms that are consumed.

b. the atoms in the air are converted to energy during the explosion.

c. the energy is converted from the heat taken in by the exothermic reaction.

d. more energy is given off by the new bonds formed than is needed to break the original bonds.

What is the independent variable in this investigation? mass volume sample number substance density

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Given the data below for the reaction, 2 a + 2 b + 4 c => d + e + 3 f, the reaction is fill in the [ ] order in a, fill in the [ ] order in b, fill in the [ ] order in c and fill in the [ ] order overall. (use the words "first, second, third, fourth" to fill each blank)experimentinitial conc of a, mol/l initial conc of b, mol/l initial conc of c, mol/l initial rate, mol/l. s1 0.1 0.1 0.2 2 x 10-32 0.2 0.3 0.2 6 x 10-33 0.3 0.1 0.2 2 x 10-34 0.4 0.3 0.4 1.2 x 10-2