Chapter 2, Section 8 Identifying Matter

Date: HW: 2.8 CTG, pg. 161 #1-3 LO: –Explain how electron excitation and different colored lights are related SC –Produce colored flames –Identify the metal ions present in materials by the colors of light a material gives off when held in a flame –Describe how atoms create the colored light –Investigate ways of producing new colors not among those produced by the materials you test –Practice safe laboratory techniques in working with laboratory burners Do Now: –2.7 Quiz –Copy LO and SC on new left side page –WDYS/WDYT pg. 157 Agenda: –Do Now –Investigate –Summary

Investigate Read Procedures #1-You are using Q-tips dipped in salts instead of splints. –Dip tip in water, remove excess, dip in salt. –Put in flame, record flame color #2-you are using a candle instead of a bunsen burner. Record observations of the candle flame.

Data Table SaltBurning ObservationsIdentification of Salt None (water) X Lithium Chloride (LiCl) X Barium Chloride (BaCl 2 ) X Sodium Chloride (NaCl) X Strontium Chloride (SrCl 2 ) X Potassium Chloride (KCl) X Calcium Chloride (CaCl 2 ) X Unknown #1 Unknown #2

Investigate #6 Answer all questions for #6 in your notebook under your data table.

Chem Talk-Read pg. 159, 2 column notes Why do the salts produce different color light? What is a nuclei? What is an electron? How do electrons move up energy levels? How do they emit different colors of light?

Summary Essential Questions pg. 160 –How do you know? –Why do you believe? –Why should you care? LO and SC reflection