# Chemistry: Balancing Formulas with Paper Molecules

### QUICK VIEW

HW: Complete the Chemistry: Naming, Bonding, Weights & More (TWO) worksheet.

CW: Complete Balancing Paper Molecules Poster front & back.

DN: Take one of each handout per pair and cut out pieces.

Reminder: Quiz Tomorrow on Naming Molecules, Drawing Molecules, Balancing Formulas, Finding Atomic Mass/Weight, Finding the number of Neutrons, and Finding the Molecular Mass/Weight.

### RESOURCES

Chemistry: Naming, Bonding, Weights & More (TWO) worksheet

Balancing Chemical Equations (Press Play)

Reuse Project + Group Member Agreements

### LESSON OUTLINE

**5min<** Students complete the Do Now by taking handouts and cutting out pieces.

**5min>** Students working in pairs write incomplete formulas on the front and back of 11x17 paper (glue two 11 x 8.5 sheets together at the edge).

**10min** Class balances the first formula (_CH3OH + _O2 —› _CO2 *+ *_H2O) together using the paper molecules. Glue molecules and correct the formula. (Front of Poster)

**10min **Pairs balance the second formula (_C2H5OH + _O2 —› _CO2 *+ *_H2O) using the paper molecules. Glue molecules and correct the formula. (Front of Poster)

**10min** Teacher explains how to complete the homework. Students begin working on the homework.

**5min **Collect materials. Clean up. Wrap up.