This week we had an egg-cellent time learning about the properties of eggs! We had the girls rotate between three stations:
- Determine if an egg is hard boiled without cracking it. At this station, Radost taught the girls that if they spin or roll the egg, the raw egg wobbles more because it has a yolk bouncing around inside! I thought this was very clever.
Trying to listen for the yolk
Shaking and listening
Teaching the “rolling” technique
- Learn how to make an egg float in water. I helped run this station and had a blast teaching the girls how to make an egg float. First, we hypothesized whether the egg would sink or float in tap water. Answers were about split: half thought it would sink and half thought it would float. I love having the girls hypothesize what is going to happen before these types of activities. It gives them an opportunity to use their previous knowledge and intuition AND makes the activities more suspenseful! After watching the egg sink in water, we passed around a container of salt and each girl added some salt. I let them know that, with enough salt the egg will float– and it did! We had to add a lot of salt though! This led to a nice discussion about density.
Passing around the salt
Until the egg floats!
- Test the strength of an egg shell. At this station, the girls had to crack 2 eggs, clean them, and balance books on the four half-egg shells. The girls were very impressed at how strong an egg shell is, considering we are so used to cracking them. This was definitely the messiest of stations!
Emptying the eggs
Setting up the based
Stacking the books!
I think its wonderful to “do science” with a common item, like an egg. What a great activity!
For this activity, we used our recent knowledge of light and optics to make kaleidoscopes. The kaleidoscopes turned out awesome! First, we reviewed some facts about light we learned two weeks ago:
- White light is a mixture of many colors.
- Light travels in a straight line.
- Light can pass through an object, be blocked by an object, or be reflected off an object.
For this activity, we focused on #2 & #3 and the word “reflection“. As a warm-up activity, we challenged the girls to bounce a beam of light off of three mirrors. This took some precision and help from the mentors, but eventually was a success!
After bouncing light of of multiple mirrors, we began the construction of our kaleidoscopes. This involved designing a pattern to look at through the scope, as well as building the triangular mirror structure (made out of mylar) to put inside the tube.
Building the scope
Taping the straw to the top
Once the kaleidoscopes were complete, the girls had a blast looking through their kaleidoscopes. They even took pictures and videos through the kaleidoscope, which was awesome!
For more info on how to make the kaleidoscope, check out the activity worksheet: GSC_Kaleidoscope
Because it was the week before Halloween, we planned an activity that explored density, but put with a creepy Halloween twist! We started by talking about what density is, and showed the girls pictures of a box with lots of colored dots and a box with few colored dots. They quickly realized that the box with fewer dots represented a lower density. Then, we explained that a lower density liquid would float on liquid with higher density.
Next, it was time to start the activity! We started by pouring the highest density liquid (honey) into the bottom of the cups. We then proceeded to pour the other liquids into each girls’ cup in order of density. We added maple syrup, water (colored with food coloring), and vegetable oil.
We handed out paper clips, small legos, and candy corn (which they were extremely excited about) for the girls to drop into their layered liquids and see which level they floated on. We talked about how you can compare the density of the solids objects to the density of the liquids by seeing where they stayed in the cup. The cups ended up looking really cool, with the separated layers of different colors, and the girls seemed to get really into it!