Textbook Notes (368,566)
Canada (161,966)
CELL445 (7)
Chapter

lecture30.pdf

3 Pages
54 Views
Unlock Document

Department
Cell Biology
Course
CELL445
Professor
Bryan Hogeveen
Semester
Fall

Description
1 2 Most students will have their final lab exam next Molecular solids week. Practice and be ready for it! Strong intramolecular forces (strong bonds within the Cornered By Mike Baldwin molecule) But relatively weak intermolecular forces (much weaker than the molecule's bonds) FDL , CO , I , Br 4 2 2 2 low–moderate m.p. (size and # electrdependent) solubiepolarlvents dipole – dipole low – moderate m.p. HCl, CHCl 3 solubielarlvents Read sections 12.1, 12.2 H – bonding low – moderate m.p. EtOH, H O 2 Practice PS #6 solutions, lab manual practice exam. solubielarlvents 3 4 Atomic solids Diamond vs. graphite both are allotropes of carbon Different subtypes: Network (diamond) The covalent bonds extend throughout the solid  Metallic  Network Examples: C (diamond), silicon carbide (replace half C  Group 18 by Si) Wide range of m.p. See figure from Table 12.6  W ~ 3400C  Hg is a liquid at room temperature  group 18 very low m.p. Wide range of hardness  Fei,hard  Cu, Ag, Au soft Insulators/conductors Remember: low m.p. doesn’t mean a weak covalent bond. It’s the intermolecular forces that are broken 5 6 Each C atom is bonded to 4 other C atoms and the Network (graphite) network is extended throughout the solid in all  Sheets / layers (see figure next slide) resulting in directions. a structure with a direction to it  high m.p.  Within a layer strong covalent bonds (each C is  very hard
More Less

Related notes for CELL445

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit