Vinegar and Water Egg Experiment

 

This week we did an raw egg experiment with vinegar and water and seeing exactly what and why acids and bases work against each other. With water not having acidity the egg shell, which is mostly calcium (another base) it doesn't break down the shell. But, with vinegar being an acid, it works to dominate the egg shell and break down the base and works against it. 

We soaked raw eggs in water and vinegar for a week in separate jars and waited. After the week was up, we removed them and took note of how differently the shells were manipulated by each liquid. Interestingly enough, you could do this same experiment with soda, orange juice, or any liquid that has acid in it. You can also see the reaction with baking soda and vinegar. (As you can see from the videos below, the vinegar dissolved the outer shell and left just the membrane of the egg and it was strong enough to bounce on the floor.)

Egg Experiment (Vacuums and Air)

We've been doing a lot of science experiments lately in the RVRS homeschool classroom. With Skylar being in the eleventh grade, there's so many things I want to fit into our schedule, but have to pick and choose which ones will give them best educational experience. One of the experiments is using a hardboiled egg, a match, and a bottle to create a vacuum with the change in air pressure with the heating and cooling air inside and outside the bottle. Here is our homemade vacuum egg experiment and how you can duplicate the same experiment in your own home.

Start with boiling an egg to hardboiled status. About five minutes for most eggs.

Next, grab a glass bottle and make sure the opening is wide enough to just have the hardboiled egg sit comfortably on top of the bottle opening.

Next, light a match and allow to burn for about three seconds. Drop the match into the bottle and place the hardboiled egg on top. And, wait. The match should burn out and you are left with the hardboiled egg being pulled inside of the bottle.

Once the air pressure inside the bottle changes from the outside air, POP goes the egg inside the bottle. But, why does this happen?

Heat causes the air inside the bottle to expand. When the egg is placed on top of the bottle, this causes the oxygen for the fire to burn to be cut off. Therefore, the fire goes out. When the fire goes out, this causes the air inside the bottle to contact as the air outside the bottle is trying to compete with the air inside the bottle. It has to remove what's blocking that process, so the air outside pushes on the egg to meet with the air inside. This is how vacuums are created (in theory). Of course a vacuum is the lack of all air, so in turn, we create a "mini" vacuum by playing with fire. 

Our Homemade Homeschool Easel

We are loving our new homeschool easel and the best part, it costs us under $50 to make. We couldn't find a decent easel online, or in stores, so we made our own. 

Jeff used pine boards for the entire thing and created the easel from a rough draft of mine. It is perfect for holding our dry erase board, our chalk board, and our posters/flip books for subjects. It also works out great for other things, as well, like painting, art, crafts, etc.

Here's how we made it:

2-63 inch boards (we used 2x4s) •THESE ARE THE SIDE LEGS

1-58 inch board •BACK LEG THAT HOLDS THE EASEL UP

1-26 inch board •ACROSS THE BOTTOM BEHIND THE LEGS TO HOLD THE SIDE LEGS TOGETHER

1-33 inch board •ACROSS THE FRONT SO YOU CAN ACTUALLY USE THE EASEL FOR PLACING THINGS ON THE EASEL FRONT

1-7 inch board •ACROSS THE TOP OF THE LEGS ON THE BACK SIDE TO HOLD THE EASEL TOGETHER AT THE TOP

1 large gate hinge

2-medium L-shaped brackets

We got out boards at Lowe's and they will cut your board to length. A lot of boards come a lot longer than you will need here, but you can get all of these cut from three boards. We used pine, but you can literally customize this and use any type of board you want.