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1.Petroleum is sometimes considered buried sunshine because it is a fossil fuel. Pressure, heat, and microbes converted what was once living matter into petroleum, which became trapped in porous rocks.

2. 1. Stretching a rubber band. 2. A wheel turning

3. During a chemical reaction, bonds are breaking and forming in order to create new substances.

4. A Molecule of Methane has ore potential energy.

5. a. potential b. Potential c. kinetic  d. potential  e.kinetic

6. The law of conservation of energy states that no energy is nether created or destroyed in any mechanical, physical, or chemical process.

7. Energy is required to break chemical bonds because energy is used as a kind of force to break them.

8. a. Exothermic b.endothermic c. Endothermic

9. The reactants give off all energy to make the product so it is exothermic.