If students were absent on the day we were guests in Mr. Diaz's classroom, they did not get to see the actual lab where we performed a 'flame test' on various ionic compounds.
Here is a video that shows much the same sort of observations students made on Wednesday. Unfortunately, we do not have Bunsen burners in my classroom, and so it is not practical to 'make up' the lab. Watch the video, students, and compare it with observations that students who attended were able to make in order to understand the material:
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