What Makes for an Effective Science Demonstration?
Posted: Saturday, September 1st, 2012
by Laura Henriques
You are standing at the front of the classroom, poised behind some apparatus. Students are watching expectantly. Something exciting is about to happen, but what? The tension in the room is palpable as students eagerly await the moment when you make the magic of science come alive. You make a motion to start the demo and then pause, pulling the students along with you to further build the anticipation. When you do the demonstration and it works you have their attention, you’ve piqued their interest and they are ready to learn.
This happens in your classroom every day, right? It could! Science demonstrations have the power to engage our students in a variety of ways. The ways in which we use our demonstrations make all the difference in the world.
Demonstrations can serve a variety of purposes. I had a friend who started every single day with a quick demo. He did them only once, and right as the bell rang. Students were required to write a brief description of what they saw and what they thought was going on. This was his daily warm-up. It was great for getting kids to class on time as he only did the demonstration a single time – if you were late you missed it and you weren’t able to get points for the warm-up without having seen the demo.
The same demonstration can be used multiple times for different purposes. At the start of a class or lecture, they can serve as a common experience to which you refer back to during class. On the other hand, if used at the end of an instructional segment they can illustrate a concept just explained. During the middle of instruction a demonstration can be used to review content or introduce new ideas. They can prompt lively discussion or be the prompt for a quick write. Some may choose to combine these approaches, for example, doing a demo at the start of class to pique interest and provide a shared experience, then repeating it again after some learning has taken place so that students can apply what they have learned as they try to make sense what happened. Demonstrations can also be motivational, giving students a reason to pay attention, read and learn. Discrepant events are really good for that purpose as they captivate student interest because of their unexpected results.
More often than not, we shouldn’t spend too much time explaining during the demonstration. You will have time after the demonstration to ask questions and teach content. Silence is golden for some demonstrations. It builds the drama and focuses attention on the phenomena. Sometimes we do demonstrations to teach a particular skill. In this situation you will want to explain while you demonstrate.
Here are some tips to consider when doing science demonstrations.
- Prior Practice Prevents Poor Performance. A teaching buddy of mine used to drill into me these “5Ps of science demos” (and labs). We have to try them ahead of time. Know how it works, be comfortable with it and be aware of the tricks needed to make it work well. Demonstrations do not always work the first time we do them. Being comfortable with the materials enables you to be confident and comfortable in front your class. If it does not work as expected during class you’ll feel better about setting it up and trying again. (As an aside, don’t spend too much class time trying to make the demo work if it has failed a few times.)
- Don’t tell us what is going to happen before you do the demo. If you take away the element of surprise by telling us exactly what to look for and what to expect (and why) then you don’t really need to take the time to do the demonstration. Consider doing the demo without any explanation at all as a way to engage the class and pique their curiosity. This creates a teachable moment – students have seen something and now they want to know how and why it works. After the explanation you can do the demo again, this time talking about what is going on while performing the demo.
- Make sure people can see! You won’t want to go to all the trouble of putting together a demonstration if your students can’t see it well. Think about how the demo will look from the back of the classroom. Is it big enough? High enough off the lab table so that all can see? Does it need a solid background to be easily seen? Perhaps you need to use a document camera to project the demo so all can see it, or you need to raise the entire demonstration by putting it on a pile of books or a box so kids in the back can see. Maybe it would be more visible if you put it on the overhead and shined light through it or projected it. If you are doing something which relies on color changes it won’t help if you are wearing a multicolored shirt, maybe you need to hold up a piece of white paper behind the apparatus.
- Consider getting students involved in the demonstration. Some demos need an assistant or a shill. Enlist the help of your students! Some of the demos are easily replicated with common materials. Consider having students try the demonstrations at home, to teach family members. Not only does this get the kids talking about science with their families, it helps them verbalize what they know as they are explaining the science. Teaching the content helps them learn the content.
- Consider recording your demonstration. Some demonstrations are very time consuming to set-up. Some take place really quickly. Some are a bit persnickety and don’t always “work” exactly as planned. For those demonstrations it can be helpful to record the demo and show it in class. This method allows you to watch the demonstration in slow motion, pause at key points (to ask questions or reiterate key points), and you can watch the demo over and over without having to set up the equipment again.
- Showmanship matters! Not all of us are comfortable being goofy in class, but doing so can make a big difference. Compare these videos of the same demonstration. While we aren’t as funny or talented as Dom Deluise, we can all ham it up a little to build tension and build interest. The demo is exciting all by itself, but Dom Deluise gets the viewer (student) more involved and invested by pretending to be nervous about the outcome.
Doing demonstrations in your science classroom does not take the place of doing labs or activities, but they can greatly enhance your instruction. Try some and see how they work. If you find a collection that work well, consider sharing them with your colleagues at the CSTA Conference in 2013 or via an article in eCCS! I encourage you to share your favorite demo via the “comment” box at the end of this article so we can all learn from each other.
For those of you who teach physics or physical science in the LA area, California State University, Long Beach hosts a monthly Physics Demo Day. The 2nd Thursday of each month from 4:30-5:30 p.m., we gather to share our favorite physics demonstrations. Topics vary each time as we move through the physics curriculum. To find out more and to RSVP for parking visit PhysicsAtTheBeach.com.
Posted: Monday, April 11th, 2016
Looking to take your NGSS presentation on the road? Consider submitting an application to present in the fellow NGSS-adoption state of Nevada!
You are invited to submit a proposal for a 90 minute presentation at the first annual Northwest Nevada Math & Science Conference on Saturday August 27, 2016. Take this opportunity to share your ideas and enthusiasm and to highlight your successes and challenges with fellow attendees at the inaugural conference. The deadline to submit a proposal is April 22. Learn More…
Posted: Monday, April 11th, 2016
by Jessica Sawko
One of the number one questions that has been posed by teachers since the adoption of the California Next Generation Science Standards in 2013 is: “What about the assessments?” (or some version of that question). Last month, we reported the most recent information available on that topic and since then work has launched to being writing and reviewing assessment items for the new science summative assessment.
Many of you may have already put your names “into the hat” to participate in this process. For those of you who have not and would like to be considered for such an opportunity, I urge you to submit your application today: http://caaspp.org/reviewers.html. CDE’s testing contractor Educational Testing Services (ETS) is soliciting applications for content reviewers for the new CA NGSS assessment and alternate assessment.
This is your opportunity to participate in the implementation of the California NGSS and the new science summative assessment. Seize the moment and apply today!
Posted: Sunday, April 10th, 2016
The National Science Teachers Association (NSTA) is currently accepting proposals for speakers to present at the 2017 National Conference on Science Education in Los Angeles, March 30–April 2. Strands can be viewed here and focus on the Next Generation Science Standards, STEM, science and literacy, and equity. To submit, please click here. The deadline to submit is April 15, 2016. Learn more about NSTA conferences. Questions? Please e-mail email@example.com. Learn More…
Posted: Friday, April 8th, 2016
by Joanne Michael
It’s coming…NGSS implementation. You’ve been going to the CSTA conferences to learn more, reading articles, following the “Early Implementers” twitter handle (@earlyimplement), and are excited to start trying out all of the new standards and lessons. One hiccup… your district isn’t ready to begin implementing-in fact, is telling you directly to NOT begin transitioning your lessons for at least another year. What’s a motivated, focused science teacher to do?
This exact situation is what I am in right now. To be fair, my district is beginning to implement in the middle school level and preparing for implementation at the high school level, but we were given direct instructions to not begin implementing any lessons at the elementary level for a bit longer (to give the classroom teachers a chance to adapt to the new Common Core math and ELA curriculum and standards). While frustrating, there are some things that can be done in the interim before getting the go-ahead to begin implementation. Learn More…
Posted: Friday, April 8th, 2016
by Terry Shanahan
In preparation for the summer 2015 Southern California K-8 NGSS Early Implementation Institute in Vista, our grade 2 cadre of science educators from elementary, secondary, and the university, planned a week of science investigations around matter and its interactions. Of course, we began our planning with the question, “What would you expect a second grader to know about matter?” After our quick write, we began our conceptual flow, using post-its for each of our statements. We then checked our conceptual flow against “A Framework for K-12 Science Education: Practices, Cross-Cutting Concepts, and Core Ideas”. Had we left out any important concepts? Our biggest idea became: Matter is observable and it is not created or destroyed even as it changes form. Our conceptual flow moved from left to right: concrete to abstract. Our smaller ideas and the concepts we found in the Framework document later became the guiding statement for each day of our institute: Learn More…