Weekend Homework

Weekend Homework pg.354 1-9 

By Kelly Moran

1.) Petroleum is often considered "buried sunshine" because the energy released by burning petroleum represents energy originally captured from the sunlight by prehistoric plants during photosynthesis therefore petroleum is like "buried sunshine."

2.) a.) Potential energy= A truck filled with explosives

     b.) Kinetic energy= A wheel turning

3.) During a chemical reaction, bonds break and reactant atoms reorganize to form new bonds therefore creating a new substance (for example when fuel is burned).

4.) A molecule of Butane has more potential energy because there are more carbon atoms which create more bonds to break. 

5.) a.) Potential energy

     b.) Potential energy

     c.) Kinetic energy

     d.) Potential energy 

     e.) Kinetic energy

6.) The Law of Conservation of Energy states that energy is neither created nor destroyed in any mechanical, physical, or chemical process.

7.) Energy is required to break chemical bonds because the formation of chemical bonds is an exothermic change which is a product of an endothermic change (energy in endothermic) which is the pulling apart of bonds therefore energy is indeed required for the breaking down of chemical bonds.

8.) a.) Exothermic change  

     b.) Endothermic change 

     c.) Exothermic change

9.) Burning a candle is an exothermic reaction because new substances are created (chemical change) when burning a candle therefore the formation of new chemical bonds are created which makes it an exothermic reaction. Lots of energy is stored into the reactants to make new chemical bonds in the product side of the reaction therefore not a lot of energy is left in the product side.