Andre is researching the history of theater sound. Help him complete these sentences.
depended on
Theater sound in the 1930s relied on,
to which sound effects were recorded.
the sound person's ability to time the effect with the correct level.

Its in the national history museum and you can't se the original because its locked away in a vault 

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

Answer volcanic outgassing;