O H HH O 2 2 H O Molecular Compounds Chapter 8.1 and 9.3

Basic understanding of covalent compounds and their properties Understand basics of a molecular formula How to name covalent compounds Learning Objectives

Compounds made from nonmetals are called molecular or covalent compounds Occurs when two or more elements share electrons to achieve stable octets Held together by covalent bonds (we will talk about this next lecture) Molecular Compounds

Properties of molecular compounds: –Low melting and boiling points –Exist as solids, gases or liquids at RT –Made of nonmetals –Neutral compounds can gain a unit charge to become polyatomic ions –Low solubility in water –No electrical conductivity (insulator)

Molecular compounds are written as molecular formulas Examples: CO 2 – means 1 atom of C and 2 atoms of O H 2 O – means 2 atoms of H and 1 atom of O Molecular Formula HH O

Naming Molecular Compounds First element is named using standard name Second element uses –ide ending Use metric prefixes on both to denote number of atoms –But don’t use mono on the first element Mono 1 Di 2 Tri 3 Tetra 4 Penta 5 Hexa 6 Hepta 7 Octa 8 Nona 9 Deca 10

Homework Read Chapters 8.1,8.2, and Page Page Page