Visitors to The Dalles Farmers Market, young and old alike, were invited to take a few minutes from their shopping for fresh produce to learn a little bit about chemistry. Our ChemClub from The Dalles, Oregon, received a ChemClub Community Activities Grant to fund hands-on activities last summer and fall at our local outdoor Saturday market. Each activity related to color in some way. Our inspiration was the National Chemistry Week 2015 theme Chemistry Colors Our World.
We offered the activities once a month, from June through October, at the markets community education booth. The five activities were:
- Nano bookmarks.Visitors made bookmarks by pulling rectangles of black posterboard through a single drop of clear fingernail polish floated on the surface of a pan of water.
- Radial chromatography.Visitors decorated squares of fabric using Sharpie markers and drops of rubbing alcohol.
- Solar S’mores.Visitors made s’mores using solar ovens made out of pizza boxes. The activity highlighted the idea that white light is made up of all the colors of the rainbow.
- Chem in a Bag.Visitors looked for clues that chemistry was happening in a bag with calcium chloride, baking soda, universal indicator, and water. They observed bubbles, a color change, and a temperature change.
- Chemeleons. Visitors painted different acids and bases onto pictures of chemeleons that had been soaked in purple cabbage juice. Depending on the pH of the solution, it resulted in a different color on the paper.
Every activity began with participants getting a safety stamp. After they listened to the brief safety rules, each person got a fruit-themed rubber stamp inked on their hand. For each of our activities that a child visited, they received an entry into an end-of-market drawing for fun science toys from Educational Innovations. We had a great time, and many people got a chance to try some summer science!
The Union Homeschool ChemClub in Union, New Jersey, made it a fun Mole Day celebration in 2016. With the ChemClub Periodic Table of Moles nearby and a stuffed ACS mole watching over the event (see photo), they started by calculating the molar mass of several chemicals and then prepared different molar concentrations of sucrose, sodium chloride, and magnesium sulfate solutions. After adding their chalk artwork to the sidewalk, they calculated how many moles of chalk they left on the sidewalk. Then they were given a mole of four different metals and had to use their chemistry skills to identify each one. They topped off the celebration by making delicious sugar cookies that spelled out “Happy Mole Day” (see photo).
In Fall 2014, Tanque Verde High School ChemClub members had an opportunity to work with 3rd grade students in our school district presenting activities about polymers provided by the American Chemical Society. We were assigned to a specific 3rd grade teacher at two elementary schools in Tucson, Ariz. (Aqua Caliente Elementary School and Tanque Verde Elementary School). For some of our veteran ChemClub members it was a second chance to work with elementary school kids.
It took us two weeks to build kits for the students to use during the outreach, as well as to practice our presentation. Most of the ideas were from the “Jiggle Gels” guide, but we included an activity to illustrate cross-linking and expanded the demo to show the making of artificial snow.
Everyone was expecting us at the elementary schools. Kids were very excited seeing us with the boxes full of materials and could not wait for us to start. In all of the excitement, lots of water got spilled on the tables. Luckily we were prepared and brought additional supplies with us!
Sodium Polyacrylate Polymer
Kids were completely stunned by the first demonstration where the water poured into a series of cups seemed to disappear when the cups were inverted. The students were even more interested in this demo when we showed them how properties of sodium polyacrylate polymer made this possible. It was a very good opening to the outreach presentation because this demo caught the students’ attention and made them want to experiment with that substance.
They really liked working with pipets and studying the properties of the sodium polyacrylate polymer.
For our next demo, we made artificial snow. That was a big hit! Everyone was fascinated with it, many saying things like “Wow! It even feels cold and wet like snow” and one student even tried to make off with a handful of the snow before we caught him.
Distributing the Gro-Dinosaurs for a graphing activity was a good break for the kids because they could remove their goggles for a while. But no one complained when we told them to put the goggles back on. They were so excited to make slime!
For the Super Slime activity most of students handled the pipet and borax solutions very well and had no trouble deciding quickly who would stir and who would add the solution. They loved the slime they had created and we could barely get some of them to divide it and store it in plastic bags so they could take it home later.
To help 3rd graders to understand how slime is made, we had a cross-linking activity. We had volunteers to wear green tags with “X-link” written on them. All other students made chains by holding hands, and the kids with the cross-link tags were grabbing to the chains.
Water, Pencils and a Plastic Bag
During the final demo we compared two plastic bags made of different polymers. Kids couldn’t believe that the PVA plastic was dissolving in water. Then we put water into a regular plastic bag to show them that it had different properties. We did this by poking sharp pencils into the bag, but this plastic is so elastic the holes made by the pencils didn’t leak. I had to refrain from laughing when almost every single kid flinched as the presenter stabbed the first pencil through the water filled bag. To be completely honest, I was actually silently praying that the bag wouldn’t rip and spill all over the floor. By the looks of him, the student presenting this was thinking the same thing.
Our students reacted enthusiastically to every part of our presentation, and their comments were the best part of the day. We kept the students engaged with jokes and hands-on demonstrations, both of which they loved. One student cheered “You guys are the most awesome people! You do all the cool stuff!” and another proclaimed “I love chemistry!” I am particularly fond of the second comment, because the girl and many of her peers were taking a genuine interest in chemistry. When we asked “Do you guys want to know how slime works?” the class shouted their approval. The participation was amazing. Whenever we asked a question, nearly everyone raised his or her hand with a grin and enthusiastic expressions. Even as their eagerness peaked, they remained respectful and followed our directions. We kept things interesting, and they did not dare turn away from us because they truly wanted to do more, and know more about what they were doing. Even beyond that, they wanted us to come back because they wanted to know even more about chemistry and what we could do with it.
My favorite part of this activity was working with the students and being able to see their reactions. One student even asked me an in-depth question about the workings of chemistry, which was very exciting to see in someone so young. I loved being able to see how enthusiastic these young students were about learning about chemistry.
During the cleanup, one of the boys walked up to me and asked “Are you going to be here every day?” I was caught off guard and had to ask “Do you mean for the rest of the year?” He nodded eagerly and I, myself, was disappointed to tell him we weren’t. After he sat at his desk a girl came up to me and said “I hope you come back next year! This is really fun.” I couldn’t help but grin and assured her that we’d be back.
I have discovered that third-graders can be surprising in what they do and do not know, so presenters should be prepared for both insights and unexpected questions. I’ve had a great time and could see the enjoyment in the kids. I hope that one day, they follow with the foundations we laid for them and join the ChemClub themselves!