Le Chatelier & Concentration: Fe/SCN
Students look for ways to increase and decrease concentrations of reactants and products, to determine which way a reaction will shift under stress.
Lab - Le Chatelier and Concentration: Student Handout
Lab - Le Chatelier and Concentration: Teacher notes
Lab - Le Chatelier and Concentration: Student Handout
Lab - Le Chatelier and Concentration: Teacher notes
Le Chatelier & Temperature: Demo (NO2/N2O4) and Activity (Cobalt)
This activity asks students to determine whether a reaction is exothermic or endothermic, based on observations of temperature stress. This C/E/R requires several steps of thinking, and is challenging for many students.
I typically do the NO2/N2O4 demo (image above) first and we discuss our reasoning as a class.
(A sealed container of these gases is placed in a hot water bath or an ice bath, and the colour changes)
The following day I will do the parallel activity with cobalt (also a demo, since it requires a fume hood) and ask students to articulate their reasoning in writing, in a C/E/R format.
Lab - Le Chatelier and Temperature: Student Handout
*Because of time constraints, I did not have time to test the cobalt activity in its new inquiry format this year. Please know that it's a draft version! It is sourced from Essential Experiments for Chemistry (Lab 12A - part 3), if you want to see the structure behind it.
I typically do the NO2/N2O4 demo (image above) first and we discuss our reasoning as a class.
(A sealed container of these gases is placed in a hot water bath or an ice bath, and the colour changes)
The following day I will do the parallel activity with cobalt (also a demo, since it requires a fume hood) and ask students to articulate their reasoning in writing, in a C/E/R format.
Lab - Le Chatelier and Temperature: Student Handout
*Because of time constraints, I did not have time to test the cobalt activity in its new inquiry format this year. Please know that it's a draft version! It is sourced from Essential Experiments for Chemistry (Lab 12A - part 3), if you want to see the structure behind it.