1. AKA: Covalent Compounds Notes #13

2.  Many compounds DO NOT form by their charges or transferring electrons.  Covalent/ Molecular Compounds: ◦ Joined by a covalent bond ◦ The SHARING of electrons ◦ Between two or more non-metals

3.  Molecule: any compound joined together by only covalent bonds. Example: H 2 O molecule.  Diatomic Molecule: a molecule consisting of TWO atoms. (Ex: N 2, O 2, F 2, Cl 2, Br 2, I 2 )

4.  A compound composed of molecules is called a molecular compound.  Molecular compounds have covalent bonds.

5.  Molecular compounds tend to have relatively lower melting and boiling points than ionic compounds.

7.  Ethane, a component of natural gas, is also a molecular compound.

8.  A molecular formula shows how many atoms of each element a molecule contains.

9.  In covalent bonds, electron sharing usually occurs so that atoms attain the electron configurations of noble gases.  Covalent Bonds: Electron sharing between neutral atoms to form covalent bonds.  Examples: Let’s use electron dot diagrams to show the electron sharing between H 2, F 2, H 2 O, NH 3

13.  A prefix in the name of a binary molecular compound tells how many atoms of an element are present in each molecule of the compound.

14.  1. Name the elements in the order listed in the formula.  2. Use prefixes to indicate the number of each kind of atom.  3. Omit the prefix mono- when the formula contains only one atom of the first element in the name.  4. The suffix of the name of the second element is -ide.

15.  Practice: Write the names of the following molecular compounds. 1. Cl 2 O 7 2. N 2 H 4 3. BCl 3 4. N 2 O 3

16.  Practice: Write the formulas for the following molecular compounds. 1. Carbon tetrabromide 2. Diphosporous trioxide 3. Iodine heptafluoride 4. Phosphorous pentachloride

17.  Compare and Contrast Ionic and Covalent Compounds.  Organize your information into a table, chart or diagram.  As a class, we will discuss your diagrams and create a public record for you to study with.

18.  Complete on your own piece of paper.  Write question AND answer  Turn in for a grade