Reactants have a starting energy of 456.5KJ , and the products end with 254.8 KJ.

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

What is the temperature of one mole of helium gas at stp?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins