1 / 12

Chemistry 111/112

Chemistry 111/112. Chapter Eight: Covalent Bonding. Molecular Compounds. So far, we have looked at ionic compounds – composed of a metal and nonmetal, bound together by an ionic bond (electron transfer)

lilith
Download Presentation

Chemistry 111/112

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. Chemistry 111/112 Chapter Eight: Covalent Bonding

  2. Molecular Compounds • So far, we have looked at ionic compounds – composed of a metal and nonmetal, bound together by an ionic bond (electron transfer) • Another type of compound exists that does not exhibit the same properties as ionic compounds • Molecular compounds are composed of nonmetals and share electrons between two nuclei • These shared electrons form a covalent bond

  3. Molecules • A molecule is a neutral group of atoms joined together by covalent bonds • The simplest kind of molecules are diatomic – those consisting of two identical nonmetals • O2, Br2, Cl2 • A compound composed of molecules is called a molecular compound • Their physical properties include lower melting points and boiling points than ionic compounds

  4. Molecular Formulas • A molecular formula is the chemical formula of a molecular compound • It shows how many atoms of each element a molecule contains • Ex. H2O, CO2, CCl4 • The subscripts are not necessarily the lowest whole-number ratios

  5. Molecular Structure • The formula does not give any indication of its physical structure • Diagrams and models can be used to help illustrate the way in which such compounds arrange themselves • Figure 8.5, p. 215

  6. True or False • All molecular compounds are composed of atoms of two or more different elements. • All compounds contain molecules. • No elements exist as molecules. • Most molecular compounds are composed of two or more nonmetallic elements. • Atoms in molecular compounds share electrons. • Molecular compounds tend to have higher melting points and boiling points than ionic compounds.

  7. Br2, KBr, CH4, SO3, N2H2, Ne2 • Identify the substance that does not exist. • Identify the ionic compound. • Which formulas represent molecules? • Which formulas represent compounds? • How many atoms are in SO3?

  8. For Tuesday, April 8th • Guided reading for Section 8.1 • Questions 3 – 6, pg. 216 • Section Review 8.1

More Related