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teaching
What Do I Do Now?
April 12, 2011 , Shawn Cornally
Honest student responses to the following prompt:
All of the following fall into one category, what is it? DNA, Carbon Dioxide, Minerals, Calcite, and Water.
What do these responses mean? These students are 14-18 years old.
Pure minerals are essentially one big giant molecule. It’s a deliberately confusing member of the list, but technically correct. In my mind, you couldn’t substitute plants for minerals and be asking the same thing, because in plants all the different molecules are not bonded together.
In fact, “minerals” could (arguably) be the correct answer here, because you can have crystals of DNA, H2O and CO2 as well as calcite and other minerals. The only thing preventing minerals from definitely being correct is the phase of H2O and CO2.
Agreed with comments above. Another approach would be to go with “Which of these don’t fit in the same category? Explain.”
I had no idea you wanted molecules either. I had a momentary panic because I had no idea WHAT you wanted, and I was being asked to guess.
When I saw the question in my reader (w/o responses), I said said “compounds” and “chemistry.” The wording is a tad vague. Besides, molecule only really applies to 3/5 (as it is usually exclusively covalently-bonded).
Rather than chasing after one right answer, I would just give them the list of items, and have students come up with similarities/differences. They may or may not come up with the word you’re looking for.
It’s so easy to write a bad question. This quiz was a rushed prep for a sub I had to have yesterday last minute. The subtle part of this question is what you pointed out: molecules really isn’t a correct answer, although no students attempted to reason with me, which is kind of why I posted this. They feel limited by the way I asked it.
I think tomorrow I’m going to do the classic sorting lesson and then post the cross-correlated results from this assessment to that one. No instruction inbetween, just to see how bad this assessment really was.
Have them rationalize their response…why is their answer correct…avoid the “guess what they teacher is thinking”….have them come up with their own question for some category
It just means the question is ambiguous. I had no idea the answer was “molecules.” Minerals aren’t themselves a molecule anyway, they are a collection of molecules which could apply to a lot of things. You could substitute plants for minerals and your question would be nearly the same.
If you look at the incorrect responses, you’ll see that nearly all of them are thrown off by the inclusion of minerals in the list.
I think you should find a way to word this question so that the answer isn’t so open ended. For example, all of the belong to the category “words that contain the letter a.”