I've been finding ways to sneak in lessons about the Nature and Processes of Science to my students in context of the curriculum we are exploring, but sometimes, these lessons are fun to have on their own. For their final assessment in chemistry, my ninth grade students will be designing and conducting an investigation to find the identity of two mystery powders. As a part of this assessment, they have to be able to demonstrate that they can write a clear, accurate, and reproducible procedure. I did some digging found an excellent resource published by the Muskegon Area Intermediate School District that I used to scaffold the procedure writing portion of this assignment.
I started the lesson by asking students two questions:
PART 1: Designing the Structure and Writing the Procedure
Notes: Although I gave students the option of either writing the procedure as they built the structure or after, all of them chose the latter option which I found interesting. I gave my students a time limit of 25 minutes to complete this part of the activity, which turned out to be a little rushed because it took them some time to settle on a design. In the future, I need to re-emphasize the main point of the activity, which is to write a clear, accurate, and reproducible procedure that someone else can follow. I ended up giving students closer to 30 minutes. Groups that did not finish within the time limit handed in an incomplete procedure.
PART 2: Following and Evaluating a Procedure
Notes: This was probably the most fun part of the lesson as students were very excited about putting their procedures to the test! At this point, I was busy at the front of the room comparing the structures groups built to the originals, although I wish I spent more time walking around asking probing questions such as, "What makes this procedure easy/difficult to follow? How can you tell which way the pieces are oriented? What would make this step clearer?"
After students had a chance to follow another group's procedure, they completed question #5 in Part II of the student handout (above). Once the students have had time to write down their thoughts I had them share their feedback with the other groups.
Notes: Some students began to get overly critical and picky about each other's procedure. At this point, I reminded them of what constructive feedback looks like, and reminded them that mistakes are OKAY - they are part of the learning process.
An extension might be to have students follow-up this activity with a procedure about making a peanut butter and jelly sandwich, brushing their teeth, or some other common, everyday task.
Note: This would also be a good time to discuss how scientific procedures differ from everyday ones, and how the formatting may change depending on the class. For example, in my class, students will be expected to write their procedures in past tense and include labeled diagrams with figure captions written below the diagram.
I will evaluate my students on their ability to write clear, accurate, and reproducible procedures as a part of their Mystery Solids Investigation performance task.
International math educator who writes, occasionally.