Unit 3 Section C Summary HW Problems Pt. 1

#1:
The energy stored in petroleum hydrocarbons was originally captured by photosynthesis in plants.  Since animals eat the plants, and both plants and animals die, layers of crude oil formed.

#2:
a. A coiled spring.
b. The spring unwinding.

#3:
Bonds break and form to create new compounds.

#4:
Butane, it has more bonds that can break.

#5:
a. Potential
b. Potential
c. Kinetic
d. Potential
e. Kinetic

#6:
The law of conservation of energy states that energy cannot be created or destroyed in a chemical reaction.

#7:
Chemical bonds being broken do not require energy, they release stored energy.

#8:
a. Exothermic
b. Endothermic
c. Exothermic

#9:
C22H46 + O2 --> CO2 + H2O
The amount of carbon atoms bonded in the reactants is far higher than the amount of carbon atoms bonded in the products, which means bonds were broken and energy was released.