Wednesday, March 14, 2012

Oil and Water, They Can Mix! Another Egg Experiment


If you've been following along, you know that we're studying birds and their eggs. We did several "eggcellent" experiments last week and now we have one more demonstration to share.

Part 1
Do oil and water mix?


For the first part our this demonstration, the kids made a lava lamp.  Nothing you haven't seen before, but I thought is would help the kids visualize that oil and water don't mix.  My younger two were able to decide which liquid was heavier, but had no explanation for their decision (it very well could have been, and probably was, a big guess on their part).  However, if your kids are old enough, you can talk about density and a little about polarity and why these molecules don't mix.  Little J seemed to follow along with my simple explanation and had plenty to say about the matter.

To demonstrate that we could mix the oil and water together, we added some Alka-Seltzer tablets.  Oh no wait, the water and oil didn't stay mixed. As soon as the fizzing stopped, the oil separated out on top of the water again.

Part 2
Can we get the oil and water to mix and stay mixed?  Yes! We just need a little help from an emulsifier, in this case, an egg yolk.


We combined equal parts of oil and water and then added an egg yolk.  Little J whisked it together and we watched to see if the oil would separate out of the mix.  After fifteen minutes, the most we saw were small oil droplets in the mixture. It looked the same when we checked in on it 30 minutes later.

Part 3
What to do with this great information?  We made ice cream!  Mint chocolate chip for St. Patty's day.  We followed this recipe from My Kitchen Addiction.  It was easy and delicious!


Vocabulary Words

Helpful Websites
Science Project Ideas has a great explanation of why oil and water don't mix and why an emulsifier, such as an egg yolk, can help mix the two molecules.


Phyllis said...

Wonderful! We are going to have to do this one! Love your whole egg series.

Anonymous said...

That ice cream looks delicious. Will you adopt me? :)

Ticia said...

Any project that ends in ice cream gets an A+ in my book.

Sherri said...

oooooooo! This is another winner!!!!

Isil said...

We also love making lava lamps here. Ahh the ice cream looks delicious. Thanks for linking up to Kids Co-op.
I am sharing your post on my FB page

Julie@teachinggoodeaters said...

Love this post! I've been learning so much about eggs and about chemistry from your posts :)

Allison said...

This looks so yummy!

maggy, red ted art said...

Ooh an experiment AND making ice cream?! How cool.

Thanks for sharing on Kids Get Crafty!

Maggy & Alissa

Raising a Happy Child said...

Brilliant! This is a wonderful experiment with a yummy ending.

Books4Learning said...

Impressive! Science and a snack. I wish I was your student! :)

Kim @ The Educators Spin On It said...

I am completely in love with your whole eggs series and can't wait to do the experiments with my daughter and her friends. Thanks for inspiring me on our Afterschool Party.

Julie said...

Sounds like a delicious science lesson!! Yum! Thanks for linking up to the Afterschool Blog Hop!

Beth ( said...

You are so clever!! What a great idea!! Thanks so much for sharing with all of us & linking up to TGIf. See you Friday,
Beth =-)

Carrie said...

What a fun lesson!! Thank you for sharing at Sharing Saturday! I hope you will share again this week!