Farewell

Summer Chemistry has gone by really fast, and I have learned a lot. Dr. Forman, you are great teacher with a great personality and heart, and I hope to have you in the future. I can't believe how fast this class went, and I hope everyone a great summer.

Feedback on the summer Chemistry course

1. I feel that Dr. Forman taught us really well because he created a stress free environment, let us socially interact, and taught us all of the concepts very thoroughly. His wonderful sense of humor also kept this 4 hour class moving in a productive manner.

2. The suggestions that I have is reducing the homework a little the last week, and taking the practice quizzes before we take the mini quiz.

3. For the economist report, we can make PowerPoint presentations, act something out in front of the class, and maybe make a video for a two week report. We can even report on a subject that we think is interesting and not from the economist every other week.

4. We could use blogs more effectively by posting something that's unique about chemistry that we find interesting on our blogs.

5. I don't the instructor should check all the homework on the blogs because we have a substantial amount of homework daily, so it would take a long time to check everyone's homework. I think the instructor should just look to see if it is completed.

6. I really like the vision that the new head of school has because the students at our school right now are always stressed about their GPA, which is great that they care about their grades, but I don't feel that it is healthy for teenagers to be feeling that pressure. I hope that we have more labs in science, fun teachers like Dr. Forman to make science less stressful and more enjoyable, more creativity in science, like the little drawings on our quizzes that we drew, and to interact with our friends and learn from each other.

3SBS 11,12 p. 258

11. a. ii

      b. iii

      c. ii

      d. i

12. The remaining 75% of gasoline's chemical energy is lost to the surroundings as heat (thermal energy).

3SCS 1, 3, 6, 13 p.279

1. a. 1
    b. 2
    c. 3
    d. large molecules composed of 500 to 20,000 or more repeating units.

3. synthetic polymers: paint components, fabrics, rubber, insulating materials
 natural polymers: silk, wool, DNA, cellulose and proteins.

6. Unsaturated is used to describe the structures of alkenes and alkynes because alkenes, which contain carbon double bonds, are described as unsaturated hydrocarbons. Because of their double bonds, alkenes are more chemically reactive, and therefore better builder molecules than are alkanes.

13. 

3 SBS 1-10 p.258

1. Petroleum is sometimes considered "buried sunshine" because the energy released by burning these fuels represents energy originally captured from sunlight by prehistoric green plants during photosynthesis.

2. a. potential energy: energy of position (wind-up toy race car)

    b. kinetic energy: energy related to motion (movement of car)

3. When an energy-releasing chemical reaction takes place, bonds break and reactant atoms reorganize to form new bonds.

4.  A molecule of butane has more potential energy.

5. a. potential energy

    b. potential energy

    c. kinetic energy

    d. potential energy

    e. kinetic energy

6. Energy is required to break chemical bonds because in an endothermic change, energy must be added to "pull apart" the atoms in each molecule. Thus energy appears as a reactant.

7. a. exothermic: energy is released

    b. endothermic: energy is added to pull apart the atoms

    c. exothermic: energy is released

8. Burning a candle is an exothermic reaction because the quantity of energy stored in the reactants is less than the quantity of energy stored in the products; more energy is given off than added.

9. 

10. The law of conservation of energy states that energy can change from but cannot be created or destroyed in any chemical reaction or physical change.

3SAS 31-38 p.235

31. a. C3H8
        b. C5H12

32. -ane designates an alkane.

33. Yes because they have identical molecular formulas but different arrangements of atoms.

34.

35.  Butane is the shortest-chain alkane that can demonstrate isomerism.

36. Because straight-chain alkanes, where each carbon atom is only linked to one or two other carbon atoms, and in branched-chain alkanes, one carbon atom can be linked to three or four other carbon atoms.

37.

38. a. short chain because there is less surface area for inter molecular forces.

      b. short chain because there is less surface area for inter molecular forces.

      c. short chain because there is less surface area for inter molecular forces.