8.Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected? 9.Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected. 10.Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

3 1/4 %

explanation:

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year