Gas Density

For the first lesson of Chapter 11, students worked with dry ice and watched a couple of teacher demonstrations involving dry ice.  To begin class, students quickly assembled into groups of 2-3 and transferred a small amount of dry ice into a deflated plastic bag which they sealed closed.  Students recorded the mass of the dry ice added to the bag, then measured the volume of the bag after the dry ice finished sublimating in order to calculate the density of carbon dioxide gas.

While waiting for the dry ice to sublimate, students hypothesized about what they might observe when water ice and dry ice were heated on a hot plate, and also what would happen when water and dry ice were added to liquid water or vegetable oil (pictured below).

Dry ice in vegetable oil (left) and water (right)

Students then observed the outcomes and recorded their observations on the Lesson 56 Worksheet.  Students also recorded the definitions of sublimation and evaporation, both of which are included in the Lesson 56 PowerPoint.  For homework, students were assigned problems 1-10 from Lesson 56 in the textbook.

Note: For students who missed class due to testing today, please watch the videos below as a substitute for participating in the lab.


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