Experiment One:
I used a few different resources for this one. There were a few YouTube videos and a few blogs that I read and looked at to nail down how I was going to run this in a large group. You can Google "plastic milk experiment" and find tons of different ways it can go.
Supplies:
- Warm whole milk (I set ours out in the sun all day and it got pretty warm). Some sites recommended a microwave, but that would be hard for a large group, maybe a crock-pot if you are in a pinch.
- Vinegar
- Strainer
- Plastic Cups
- Tool for stirring
- Cookie cutters (my co-worker thought to use candy molds, which I think would totally make this project rock in large groups, but after the event)
Prep:
- Red solo cups with wooden craft sticks in them.
- Stack of small paper plates with paper towels on them
- Three large bowls with strainers over the top.
- Table of cookie cutters laid out.
I started off by giving each kid a red solo cup (insert song in your head here) and a wooden craft stick.
My lovely assistant and I went around the tables giving each kid a cup of warm whole milk. Then my parent volunteers who attended with their kiddos followed behind us pouring 1 tablespoon of vinegar into their cups.I had them stir for a loooong time. Probably five minutes, some elected to stir longer. After most had been stirring for a while I had them come to the table one at a time and dump their mixture into a strainer over a bowl. When the whey had gone through the strainer, I plopped the "caesin" or curds on their paper towel covered plate.
They had to dry out their caesin with the paper towels, the more dry they got it the better it worked in the molds. After they got "most" of the whey out of their caesin, they patted it flat then used a cookie cutter to make a shape. Picking up the stuff that fell outside the cookie cutter and putting it inside the cookie cutter and patting it down made their shapes more sturdy. I highly recommend using Meagan's idea of a candy mold for the shapes (brilliant!). They left them on the paper plates for later and we moved on to the next experiment.
They had to dry out their caesin with the paper towels, the more dry they got it the better it worked in the molds. After they got "most" of the whey out of their caesin, they patted it flat then used a cookie cutter to make a shape. Picking up the stuff that fell outside the cookie cutter and putting it inside the cookie cutter and patting it down made their shapes more sturdy. I highly recommend using Meagan's idea of a candy mold for the shapes (brilliant!). They left them on the paper plates for later and we moved on to the next experiment.
This experiment can be found all over the internet, just Google "milk soap experiment".
- What was left of the whole milk (about a gallon)
- 1/2 Gallon of 2%
- 1/2 Gallon of 1%
- Tall container of buttermilk
- 2 short containers of half and half
- dish soap
- Qtips
- Plastic Shot Glasses from the Dollar Store
- Plastic trays with sections from the Dollar Store
- Food Coloring or liquid watercolors (if you haven't discovered these guys yet, they are the bomb!)
Prep:
- Put about 1/2 inch of soap in the bottom of the shot glasses and stuff a bunch of Qtips in them (those are technical terms). Each kid will need several Qtips, I think I used about 10-12 shot glasses and refilled later as needed.
- Label one tray with what type of cow product goes where. Each type of milk should have a spot.
I gave each kid a tray, then I had parent volunteers (pulled from the hallway) pour their liquid into the designated tray spots. After the milk was poured, I had the kids put drops of food coloring 2-3 per section. They had a hard time not mixing the colors and were sadly disappointed later if they had. After they all have their liquids and coloring, I did one demonstration in the middle on a thick paper plate to show the kids how to "use" their Qtips. After that it was a free for all!
That was our last project, so the kids could just leave their milk trays on the table and leave, because there was going to be no crying over spilled milk on my watch (ha ha).
.JPG)
