D.5 YAY!

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10.
11.
a.C5H12 + 8 O2--->5 CO2 +6 H2O
b. C3H8 + 5O2--->3CO2 +4H20
c. 2 6CH14 +19O2 --->14 H2O

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1.
a.Pulling apart magnets is similar to breaking chemical bonds because 2 parts come together to create one thing, and then those are being torn apart as well. Also, they both have opposite attractions towards each other.
b.Pulling apart magnets involves adding energy because it is the force that pulls them apart.
c. Adding energy is needed in both situations, acting like a force to pull things apart.
d.This is similar because energy involved in making chemical bonds because the energy is subdued in order to bring the magnets together,

2.
a. No because endothermic means that energy is being added. But here, energy is being released.
b.Biochemicals from prehistoric animals and plants.