Balancing Chemical Equations Activity
by Liz LaRosa
click here for a pdf version of pages 1, & 3 and page 2
Updated Oct. 2007: Click here for activity cards ready to print in pdf format! Cards 1 & Cards 2
Materials: These account for one complete set. Color scheme is VERY important for visualization during the activity.
|on 3x5 Index Cards||2 orange 6's||1 red "Reactants"||CO2||Fe||N2||Na2SO4|
|4 red 2's||2 black 7's||on 5x8 Index Cards||CH4||Fe3O4||NH3||O2|
|4 blue 3's||2 blue "+"||Al||C2H6||H2||Na||P4|
|4 green 4's||1 black "yield" sign --->||Al2O3||CaCl2||H2O||NaCl||P4O10|
|2 purple 5's||1 purple "Products"||C||CaSO4||H2O2||Na2O|
Pre Lab Questions:
Answer the following before you begin the activity:
Record the following information into Table 1:
Table 1 : Chemical Equations (whole page, large boxes, sideways into lab book)
Make the following Equations on your desk Reactants Products Reactants - Final Products - Final Balanced Equation H2 + O2 --> H2O H2O2 --> H20 + O2 Na + O2 --> Na2O N2 + H2 --> NH3 P4 + O2 --> P4O10 Fe + H2O --> Fe3O4 + H2 C + H2 --> CH4 Na2SO4 + CaCl2 -->
CaSO4 + NaCl
C2H6 + O2 --> CO2 + H2O Al2O3 --> Al + O2
2-3 sentences on what you learned.
The index cards are a bit time consuming to create. I had some students help at lunch time for a few days. Once done, you can laminate them and have them forever! The materials account for one complete set which is good for 2-3 students to use.
Print activity cards on card stock instead of making index cards for quicker set up.
The color coding is very important for visualization. It is easier and quicker to locate the elements that you are trying to balance. If everything is in black ink, its harder to distinguish the equation contents.
I use this towards the end of my chemistry unit, its a great assessment tool because it involves a vast amount of abilities that were learned during the chemistry unit. I do the 1st two problems with the students to guide then through the procedure, and make sure they understand what is expected. This activity takes about 2 - 3 "45 minute" class periods. I follow up with a worksheet as a homework assignment.
© Copyright 2000, E. S. Belasic