CP06 – Formulas

Date:

• Thursday, September 8th

Class Business

• review homework (table of particles)
• questions? thoughts?

Basics

• subscripts / coefficients
• parentheses
• examples (book practice below)

Elements

• some elements exist naturally in pairs (or more)
• formula looks like compound – actually natural element
• examples (below from textbook)

Ions and Molecules

• when an atom (or group) has an imbalance of electron / protons
• can be positive or negative
• the “charged” particle is an ion
• examples of groups (see document in Schoology)

Oxidation States

• Defined (personality)
• all elements have at least ONE (often more)
• can be predicted from PT
• examples

Homework

• Study for Quiz
• first part of “Oxidation Numbers” sheet
• I provide element – you write name, symbol, number
• you get to use periodic table
• (will quiz on next parts in coming days)