Monday 1/22 - 

• In Class: Discussed the formation of Stalactites and how they form from double-displacement and combination chemical reactions. We took notes and wrote the chemical equations for this reaction and discussed how Stalactites are precipitates left behind in this chemical reaction. We went over the solubility rules for predicting precipitates - students copied rules in their books.

• Homework: Predicting Products Worksheet #2; Study for Quiz Ch.16.3 and Ch.11 on Friday

Tuesday 1/23 - 

• In Class: Reviewed 'Predicting Precipitates' concepts, and 'Colligative Properties' concepts (related to our lab last week and Ch.16.3) and had time to work on our in-class assignments which are due end of class on block day. Ch.11.1 - 11.2 Lesson Check Questions & Ch.11 Assessment (Questions #34-47 and #58 (skip part 2))

• Homework: In-class assignments due end of class on block day. Study for Quiz Ch.16.3 and Ch.11 on Friday

Wednesday/Thursday 1/24 - 1/25 -

• In Class: 'Types of Chemical Reactions' Lab

• Homework: Lab Write Up Due Tomorrow. Study for Quiz Ch.16.3 and Ch.11 on Friday

Friday 1/26 -

• In Class: Quiz Chapter 16.3 and Chapter 11

• None

Notes on Stalactites

1. Formation of Stalactites: Calcium Carbonate (CaCO3) mixes with H2O and CO2 to form a Calcium Bicarbonate Solution (Ca(HCO3)2). This solution drips down through the rock. When the solution is exposed to air, the H2O and CO2 evaporate and leave behind a CaCO3 precipitate. Therefore, stalactites are CaCO3 (Calcium Carbonate) precipitates.

2. The chemical reaction equation: CaCO3 + H2O + CO2 = Ca(HCO3)2. This reaction is both a combination and double-replacement chemical reaction.