Chapter 2, Section 8Identifying 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 TableSalt Burning Observations Identification of SaltNone (water) XLithium Chloride (LiCl) XBarium Chloride (BaCl2) XSodium Chloride (NaCl) XStrontium Chloride (SrCl2) XPotassium Chloride (KCl) XCalcium Chloride (CaCl2) XUnknown #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