1 / 25

Slide 6: question “3” not question “7”

Slide 6: question “3” not question “7” Slide 13: You may not use all valence atomic orbitals to make a bond (ex, borane, water, sulfur hexafluoride. Is that what you mean?? Slide 18: used symbol to insert nice looking triple bonds. Please let me know when ethics section is integrated.

aamendola
Télécharger la présentation

Slide 6: question “3” not question “7”

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Slide 6: question “3” not question “7” Slide 13: You may not use all valence atomic orbitals to make a bond (ex, borane, water, sulfur hexafluoride. Is that what you mean?? Slide 18: used symbol to insert nice looking triple bonds. Please let me know when ethics section is integrated.

  2. Intersection 4 9/26/06 Reading: 8.6 bond length p 348-351 8.10 exceptions p 363-366

  3. Outline • Concept Questions • Lewis Structures • Bond Length • Ethics

  4. Question 1 Following is a list of properties of a sample of solid sulfur: • Brittle, crystalline solid. • Melting point of 113oC. • Density of 2.1 g/cm3. • Combines with oxygen to form sulfur dioxide Which, if any, of these properties would be the same for one single atom of sulfur obtained from the sample? • i and ii only. • iii and iv only. • iv only. • All of these properties would be the same. • None of these properties would be the same.

  5. Question 2 Which of the following samples could be methane, CH4?  A sample that contains: (a) 25% hydrogen by weight; 75% carbon by weight (b) 4.0 g of H atoms and 1.0 g of C atoms (c) 0.40 mole of H atoms and 1.0 x 1023 C atoms (d) 0.40 mole of H2 molecules and 0.20 moles of C atoms

  6. Question 3 True or False? When a match burns, some matter is destroyed. • True • False What is the reason for your answer to question 3? • This chemical reaction destroys matter. • Matter is consumed by the flame. • The mass of ash is less than the match it came from. • The atoms are not destroyed, they are only rearranged. • The match weighs less after burning.

  7. SO4-2

  8. Cyanate NCO- • Draw the Lewis Structure: • Formal charge rules • The smaller the better • Negative formal charges should reside on the more electronegative atom • Avoid like charges on adjacent atoms

  9. Draw the Lewis Structures for the Following Molecules • BH3 • SF6 • PCl5 • NO

  10. Group 3

  11. Expanded Octet An expanded octet can be achieved with atoms that have d-orbitals in their valence shell.

  12. You must have an atomic orbital in the valence shell for every bond that you make. You may not use all valence atomic orbitals to make a bond (ex, borane, water, sulfur hexafluoride.

  13. Radicals

  14. Are all bonds the same?

  15. Bond Order • Single bond - first order • Double bond = second order • Triple bond  third order

  16. Bond Length (pm): the distance between the nuclei of two bonded atom

  17. Ethics Name a situation in science where an ethical decision must be made? What behaviors/practices in science would you consider unethical?

  18. List all of the ethical issues in the case of Millikan? List all of the ethical issues in the case of Schön? How are the situations in the two cases similar? How are they different? Did Millikan behave ethically in reporting his data? Why or why not? Did Schön behave ethically in reporting his data? Why or why not?

  19. If you were faced with a portion of your data that "didn't fit" your hypothesis what would your options be? What are the consequences of publishing incorrect data?

  20. Mark and Jerry List the ethical issues in this case What are the consequences of reporting the data? What are the consequences of NOT reporting the data? Does the fact that Jerry Elrod tells Mark that anything under 5% unfavorable results is insignificant relieve Mark of any further responsibility? If Mark wonders whether Jerry's 5% standard for reporting data meets regulatory standards of acceptability, how might he go about finding out?

  21. Under what conditions, if any, do you think it is ethical for scientists not to report all data in cases related to pollution?

More Related