Tag: science experiment

Ink Chromatography Experiment

Materials:

  • Glass vessels – glass cup, graduated cylinder, etc
  • Coffee filter
  • Scissors
  • Shish kabob skewers
  • Water
  • Colored markers – ideally include a few black markers from different companies

Process

  1. Cut the coffee filter into strips
  2. About 1” from the bottom of the strip, put a dot using one of the markers
  3. Skewer the strip at the top and hang over a glass of water
  4. Hang the strip over the glass
  5. Carefully fill the glass with water until it just touches the bottom of the coffee filter strip.
  6. It will take a few minutes for the water to move up the strip. Once the water has finished moving up the strip, take the skewer and strip off the glass. Empty the glass of water, then place the strip and skewer back on the glass to dry.
  7. Notice how different inks are made of different color combinations. Notice different inks carry different distances up the filter strip.

 

Science Experiment: Soil Composition

We did a simple experiment today that shows the composition of soil — get a jar, dig down 6″ and get a scoop of the soil. Put the soil in your jar, add water, close the lid, shake it around, then let it sit for a day. Anya wanted to take samples from a few different locations to compare.

ID Location
1 Under pine trees
2 Garden
3 Deer path in woods
4 Front planter bed
5 Irises

The soil from the deer path, I expected to be almost all clay — between the rain and the deer running through it, the path is a sticky, mucky mess. It has clay, but not as much as I expected.

And the rest of the jars

Science Experiment: Potato Powered

I came up with a bunch of science experiments for Anya’s covid not-a-break. Some are really straight-forward, some are open-ended design challenges, and some are pretty tricky. I thought the potato powered LED experiment was straight-forward. A list of materials, step-by-step instructions, and a clear visual product. Except … one potato generated like 0.8 volts. Cut the potato in half, get some extra clips, and we’re up to 1.6 volts.

I’d read about a research project where energy production was increased by using a boiled potato … I needed to make lunch anyway, so I boiled a bit of potato. I also microwaved another bit of the potato — so we’ve got two raw quarters, a boiled quarter, and a microwaved quarter. All four produced about 0.8 volts. In combination, this was enough to light up an LED.

Reading the article, it looks like Wh capacity is what is increasing … not output voltage. Connecting all four quarters (plus finding more pennies, nails, and clips) produced enough power to light up our LED. Now we’re seeing how long the potato-powered LED lasts. From 3PM on 24 March 2020 until … well, it needed to get cleaned up on 26 March as the potatoes started getting dodgy.