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Molecular Models: Lewis Structure and VSEPR Theory

Intro to Chemistry Chem1020 Lab. Molecular Models: Lewis Structure and VSEPR Theory. Chemistry Department Minneapolis Community & Technical College. Overview. Part I Molecular modeling kit Part II Data sheet. Part I. Molecular Modeling Kit. Cover. Content. Atoms. 4 holes

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Molecular Models: Lewis Structure and VSEPR Theory

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  1. Intro to Chemistry Chem1020 Lab Molecular Models:Lewis Structure and VSEPR Theory Chemistry Department Minneapolis Community & Technical College

  2. Overview • Part I Molecular modeling kit • Part II Data sheet

  3. Part I. Molecular Modeling Kit Cover Content

  4. Atoms 4 holes C, N, O, or F 4 holes C, N, O, or F 4 holes C, N, O, or F 1 hole Hydrogen (Note: The underlined element(s) is/are the preferred one(s) representing that specific color.) Attachments One of the multiple bonds (long and flexible) One nonbonding (or lone) pair Single bond (short and rigid)

  5. Part II. Data Sheet You will obtain a data sheet at the beginning of the lab. The sheet includes 10 species that contain covalent bonds. For each species, you need to: count the total number of valence electrons from all atoms present; draw its Lewis structure; make its 3D model using the molecular modeling kit; determine the total number of electron regions around the central atom; describe its electronic geometry in words; determine the number of bonding regions around the central atom; determine the number of nonbonding regions around the central atom; describe its molecular geometry in words; sketch its 3D structure.

  6. Example: H2O

  7. Dissemble all of molecule models and put pieces back to the kit container according to the picture on page 3. • Ask your instructor to sign you out….then you are ready to leave. • Finish the data sheet after the lab. Feel free to ask instructors questions, but never ever copy other students’ answers. • Turn in the data sheet the next time when you are expected to come to the lab. • Don’t forget to prepare for the next lab before you come next time.

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