Homework Due Wednesday July 24

#31-38 pg. 235

31. A. Formula: C3H8

            Molar Mass: 44 g
       B. Formula: C5H12
             Molar Mass: 72 g

32. Each name is composed of a prefix, followed by -ane (designating an alkane). The prefix indicates the number of carbon atoms in the backbone carbon chain. The prefixes are derived from Greek, hex meaning six. 

33. No because they do not have identical molecular formulas. 

34. 

35. Butane.

36. Saturated hydrocarbons are linear, but they are arranged as zig-zags for models and diagrams. 

37. A. 

            

    B. The branched chain molecule.

38. A. Short

       B. Long

       C. Short 

#1-10 pg. 258

1. The energy released by burning fuels represent energy originally captured from sunlight by prehistoric green plants during photosynthesis. Thus, fossil fuels such as petroleum can be thought of as forms of buried sunshine.

2. A. Potential energy is energy of position (or condition). An example is a wind-up toy race car. The "winding-up" energy that was originally supplied tightened a spring in the toy.

    B. Kinetic energy is energy related to motion. An example is when the toy car moves, the spring unwinds, providing energy to the moving parts.

3. When an energy-releasing chemical reaction takes place (such as when fuel burns), bonds break and reactant atoms reorganize to form new bonds.

4. Butane because it contains more carbons so the molecule contains more electrons causing more potential energy.

5. A. Potential Energy

     B. Potential Energy

     C. Kinetic Energy

     D. Potential Energy

     E. Kinetic energy

6. It yields products with different and more stable bonding arrangements of their atoms.

7. A. Exothermic because energy is being released

    B. Endothermic because it is breaking apart

    C. Exothermic because energy is being released

8. Burning a candle is exothermic because it is an energy-releasing process because and energy is being given off. 

9. 

10. No energy is created nor destroyed.