Tag Archives: chemistry

New Blog Post at ChemEd X-Change: Review of Free iPad App “Chemical Detectives”

It’s been a slow few months for me, as I’ve been bogged down with school work. But I’m back on a bit of a writing schedule, so I hope to be more active this year.

ChemEd X-Change just published a blog post of mine about an iPad App (Chemical Detectives) that gives students an opportunity to practice identifying compounds using spectra (C-13 NMR, proton NMR, Mass Spec and IR, along with percent composition data). It’s one of the best free iPad Apps I’ve ever seen, actually.

Check it out here.

Until next time, keep it #MintyFresh

Lowell

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Filed under #EdTech, ChemEd X-Change, Chemistry, iPad Apps

My first attempt at whiteboarding…without the whiteboards

I’ve got a flurry of firsts going on here! I love it.

I’ve been inspired to go beyond my normal routine lately by quite a few of the members of my PLN on Twitter. Last week I tried a ‘modeling’ discussion with my MYP Chemistry class. This week I tried whiteboarding. This was, again, inspired by the folks doing modeling and sharing ideas on #modchem. There was only one catch: I don’t have whiteboards. Yet. So what’s a guy to do?

Ask his PLN for ideas!

I did that quite a while ago and @dragan39 suggested I use neon whiteboard markers on a lab table. The funny thing is they don’t erase very well from the white board. But with a damp paper towel, they erase just fine from the lab table.

For my DP chemistry class, we’re working on Topic 1, Quantitative Chemistry. Some of my students had me for pre-DP chem last year and have quite a bit of background. But others didn’t have that luxury, so I’ve gone full in for teaching everything just to make sure everybody has the same base of knowledge.

Last year for this I had the students watch a video for homework, then they worked – mostly independently – in class on the problems. That’s a good step in the right direction, as I got to spend quite a bit of time working my way around the room to help students. I still like the flipped model for DP classes where a lot of content coverage is necessary.

But I don’t just want to cover content. I want my students to really understand what they are working on in class. So after having students watch my video last night, today I had them get into groups and solve a quick mole mini-lab. They had a sample of aluminum (approximate mass = 14 grams) and a sample of zinc (approximate mass = 11 grams). They had to determine which sample had more atoms. I love this one (yes, for DP it’s quite simple, but it’s the beginning of the unit) because I can probe the students’ understanding of atomic structure as well. A group will show me their answer. My response, “So, you’re telling me that the sample of aluminum has LESS MASS than the sample of zinc, but it has MORE ATOMS? How?” That gets them to pause and consider the atomic structure again. And it gets them to really consider what the conversions mean as a method of problem solving.

After that problem, I had them clean up the lab benches and give them a good cleaning with a wet paper towel, then a quick dry. They grabbed some markers and I posted the first problem on the board. The students started writing. I wandered around the room, engaging each group in dialogue about their problem solving method. Once the students were done (if correct), I take a picture of their work. Later, I posted the pictures in a folder to the class SkyDrive folder. If the group wasn’t correct, I asked them questions about their work in hopes of driving them towards the right method and answer.

Students use neon markers and work in groups to solve problems.

Students use neon markers and work in groups to solve problems.

Once all of the groups were finished, I posted the next problem. At that point I asked the groups to switch who held the pen first. I encouraged them to work together, and to help the person with the pen if needed.

Rinse. Repeat.

Now for some reflection.

The good, in no particular order:

  • The students were TALKING chemistry and problem-solving during their work today.
  • Every student got to be in charge of the pen.
  • The students got to see a variety of problem-solving strategies.
  • In response to the question, “On a scale from 1-4 (4 is the highest), how useful was today’s activity to learn about mole calculations?” the average score from my two DP classes was 3.79. The mode was 4. The only other score was 3. So the students perceived that it was useful for their learning.
  • There was definitely some peer teaching going on.
  • For my closure activity, I asked students for feedback (and it was positive, as noted above). I also asked them a conceptual question, “Explain – at the particle level – why 1.0 mole of gold has more mass than 1.0 mole of silver, even though they both have the same number of atoms.” There were no incorrect answers given. No misconceptions written down. Granted, some students did more at the particle level, discussing the nucleus of gold atoms having more protons and neutrons – with more mass – than the nucleus of silver. But overall, the answers were quite strong. 

Things to improve/change, again in no particular order:

  • Occasionally – but not as drastically as I expected – there were delays for some groups while waiting for other groups to finish. I’m not sure how to deal with that yet. Thoughts?
  • I didn’t do any inter-group sharing. It just didn’t make sense to do that for today’s questions, and I wouldn’t do it differently for this activity. However, for other content I’d probably do more sharing between groups.
  • Next time – when doing a problem-solving and/or calculation-heavy activity, I’d like to include an actual calculation in my closure activity/exit pass so I can see how the individuals are doing. As mentioned above, I got some formative assessment data on the conceptual understanding, but I’d like to see each individual complete a calculation also. More data to use.
  • Some students wanted a chance to work the problems individually before the group work. This may come from my use of Learning Catalytics (see my blog post here about that) where students answer individually, followed by group discussion. I think the whiteboarding will be more useful for some things, but for reveiw Learnign Catalytics (a.k.a. peer instruction) will still hold some weight with me.

So where do I go from here? First, I need to order more neon white board pens! And I need to keep trying new ways to get my students talking chemistry within my class, and focusing on their understanding at the particle level. I’m having a lot of fun.

And I thank those that have inspired me! (There are too many to list, but teachers at my school that are willing to talk pedagogy, my PLN on twitter, #chemchat and #modchem, and so on.)

Until next time, keep it minty fresh!

Lowell

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Filed under #ModChem, Chemistry, Pedagogy

My first attempt at using the modeling pedagogy within my MYP Chemistry class

As I mentioned in a previous post, I’ve been inspired by @Central Science to explore things at the particle-level within my class. I’ve started following (when I have time!) the #modchem conversations on Twitter along with #chemchat to get ideas and find ways to improve my practice. The modeling pedagogy is heavy on students working in groups, whiteboarding their work together showing lots of diagrams of what is happening at the particle level within the different topics of chemistry that are taught in a traditional chemistry class. And #modchem folks, feel free to correct any misconceptions I may have about the pedagogy, as I’m really a neophyte here. Speaking of misconceptions, that’s one of the strengths of this method of teaching in my mind. In looking at student diagrams and hearing their explanations of what is happening at the particle level, I can really assess their understanding and identify misconceptions that need to be discussed.

And yet more speaking of misconceptions: My lesson actually started with a look at the misconception discussed in my blog post here, and shown in the diagram below. My students really struggled with the idea that since ice floats, it has to be less dense…therefore the particles must be farther apart in ice compared to liquid water. This discussion started by asking my students to develop a working definition of density and draw the particles of two substances, A and B, where substance A is more dense then substance B. And their drawings of this were spot-on. (Although as I type this, I realize that this makes the assumption that the molar masses of the substances drawn are relatively equal. Hmmm.) Then I challenged them to compare that to water floating. Lots of puzzled looks and brains turning as they struggled with the comparison of MOST solids being more dense when compared to the liquid form of the same substance. This isn’t the case with water. Luckily, we had just performed a lab with lauric acid. One student pointed out that we got to observe lauric acid as a solid in liquid lauric acid and it SANK! So this was a fantastic discussion.

One student's drawing. I chose this drawing (with the student's permission) as it was fairly representative of the students' responses.

One student’s drawing. I chose this drawing (with the student’s permission) as it was fairly representative of the students’ responses.

Now on to the actual modeling lesson. Let me start by saying that I have not yet attended a modeling chemistry workshop, so I’m certainly no expert here. In fact, I’m hoping for some feedback from people that DO modeling and have been to workshops so I can improve. First, some background on the lesson. It’s within a unit on states of matter and phase changes. The first day of the unit involved creating melting and freezing curves for lauric acid, a good compound for this as its freezing point is about 43 degrees celcius. Within the lab, students got to see the temperature stay relatively stable for quite a while during the melting and freezing cycles. This challenges them a bit, as they wonder if the temperature probe is ‘stuck’ or something. Nothing but great teachable moments throughout the lab. So for day 2 I had planned a relatively traditional lecture on states of matter and phase changes. (On a quick side note: traditional lectures in my class aren’t just me talking and students listening. They are quite interactive. But they are limited, and I’m moving away from them more and more.) Rather than do the same lesson as last year, I wanted to delve into modeling as an experiment. I planned a series of demonstrations and had the kids do some predictions and discussions within groups about each demo. Then, once the demo was finished the students had to assess their predictions and explain what was happening at the particle level. Whiteboarding at its finest! Except for one small detail. I don’t have whiteboards for the groups yet. So they worked on paper and we did some in-class discussion.

One demonstration involved dropping (without stirring) food coloring into hot and cold water and observing the changes. For this, I had the groups draw what the beaker would look like at time=0, time = 2 minutes, and time = 20 minutes. See the image below. And while this diagram specifically isn’t at the particle level, the discussion within the groups involved motion of the particles and the interactions between the water and the dye.

Hot and Cold Water wtih Drops of Food Coloring (Not stirred)

Other demos included the following: creating two balloons and putting one in the freezer for about 45 minutes, putting melted lauric acid into a beaker of water and tracking the temperature change as it heated, and a replay (with discussion) of a demo the students had actually seen through a video. This demonstration shows saturdated sodium acetate solution doing some really weird things – linked here and a few screenshots below. The purpose of the video was to get their curiosity going a bit about phase changes.

Pouring Saturdated Sodium Acetate Snapshot-Stalagmite

Now for some reflection: First, what worked? Certainly the structure of getting students into groups and asking them to DISCUSS their ideas was really beneficial in my mind. I really would have liked having some whiteboards (they are on order!) to make sharing easier. The demos were all helpful. The students had probably seen the food coloring demo before, and the baloons also. I challenged them to go beyond a basic understanding and really get at the details of the changes at the particle level. That’s the recurring theme here, and I think it worked to some degree. The students were talking in ways I hadn’t gotten them to discuss before. It was fantastic!

So what didn’t work? As I mentioned, I’d really like the whiteboards to center the discussion. But that’s a minor detail – and a bit too obvious. I think I could have done a better job of pacing, going forward when their discussions lagged and drawing back and waiting while they finished other discussions. I also felt I could have pushed for more class discussion after the group discussion and done fewer demos – or spread it out over another class – so that we could have gone deeper into the content. I also need to find a good demo to prompt their thinking about energy transitions during phase changes.

And how did the students like it? Their closure activity was an exit pass. Question 1: On a scale of 1-4 (4 being the highest), how much ‘learning’ did you have today? Explain. Question 2: Explain – using particle theory – how a straw works to drink. From 19 responses (out of 20 students…not sure who I missed) the average rating was 3.4. Obviously this is a bit open-ended. The more valuable piece of feedback here was their explanations. The students provided some good feedback about wanting more class discussion after the group discussion and pacing ideas. The second question will need to be addressed at some point, because many answers described the ‘sucking’ as the driving force, rather than the pushing up the straw by atmospheric pressure.

The bottom line for me is that I’ve really started to transform my teaching in order to really get at what students understand. And I’ve worked at addressing their misconceptions based on this data. I can’t wait for more!

My request: If you are a #modchem or #modphysics person, what ideas do you have based on my reflection above? Where can I improve? Any feedback would be appreciated.

Until next time…keep it minty fresh!

Lowell

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Creating an MYP Science and DP Chemistry Comment Bank

My school has a focused professional growth and evaluation plan that involves a Personal Teaching Initiative (PTI). The PTI asks us to find some part of our practice that we’d like to improve. This year I chose feedback, as I’d like to improve not only how quickly I provide feedback but the quality of my feedback. And to add to the ‘high quality’ feedback discussion, I’m working on finding methods to actually engage students in my feedback so that it is used more effectively.

To that end I’m creating a comment bank for my MYP chemistry labs and for my DP chemistry labs. They will not be the same, as they are based on different criteria. There are two main reasons I’m creating the comment banks. First, I am trying to make marking more efficient so I can complete it quickly – yet still effectively. Second, I am hopeful that my comments in the comment bank will actually be more descriptive/explanatory, and thus of more value to the students.

Last weekend I marked a set of labs for my MYP chemistry class and created the comment bank as I went along. The comment bank can be found here. I simply added comments to the comment bank that were used multiple times within my class of 20. On the lab report of a particular student, the raw data table might say “E.1” for the comment. The student then goes to the comment bank (linked on my class website) and sees that E.1 means, “Uncertainty (or uncertainties) missing from raw data table.”  When I have time, I’d ideally like to add more detail (see the “second reason” above for my justification). For E.1 the extra detail might be a sample data table that actually has proper uncertainties. If you have feedback on the MYP comment bank, I’d love to hear it! And feel free to borrow the comment bank and make it your own.

Now for my DP comment bank, I’m interested in getting some feedback on actual comments to include. Therefore I’ve created a survey (linked here) for people to add to my comment bank. If you have a comment that you use repeatedly in marking your DP students’ work, please share it here. If you complete my survey, I ask at the end if you’d like me to email you a copy of the results. Once I am done (give it a few weeks or more), I’ll compile the comments – trying to condense the comments that are similar – into a new comment bank and share that with interested teachers. I am asking you to share your email in the survey. I will not use your email for any purpose other than to send you the results when I am finished. And I will not share your email with anybody else.

I plan on sharing my impressions of using the comment bank with my classes, along with a few of the strategies I’ve developed (or borrowed from others!) to engage students with my feedback.

Thanks for your help.

Until then, happy marking!

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