What are some fun experiments to do with household objects/ingredients?

Answer 1

I always enjoy making "rubber eggs." Only two ingredients are needed: eggs and vinegar.

Place uncooked eggs in a jar with a loose fitting lid. Cover the eggs with vinegar. Allow the egg shells to dissolve in the vinegar (which you should change every couple of days).

Change the vinegar one last time after all of the shells are gone. The acid in the vinegar will denature the protein in the eggs and turn them rubbery.

Fun things to do with rubber eggs:

Drop one. Instead of having a big mess to clean, the egg will bounce.

Using a wire, lower a lit candle into an old style glass milk bottle. Immediately cover the top of the bottle with one of the rubber eggs. When all of the oxygen is consumed, the partial vacuum will suck the egg into the bottle. Use the wire to remove the candle.

Like a cooked egg, a rubber egg will spin even standing on the small end. An uncooked egg will always fall over.

If you have made several, see how many you can stack (this is possible but requires dry eggs).

Rubber eggs are great for a quick game of egg toss.

When you get bored, see how high you can throw one (outside). Watch what happens if you do not catch it.

You can use food coloring to color rubber eggs just like Easter eggs.

Find out how much salt (or sugar) you need to dissolve in water to make the rubber egg float.

Answer 2

this is really more first grade then anything else but:

baking soda in a cup/flask/whatever and add vinegar- cool "eruption" effect.
coke bottle and add in a pack of mentos- incredibly high spurt (outside activity)

more advanced (electrolysis)
large container of deionized water (or just spring water if deionized isn't available) with about a tablespoon or two of ammonia, turn two clear cups/flasks/test tubes upside down inside of it and make sure there are no bubbles at all, take 2 copper wires (preferably insulated except at the ends), insert one end into the flask, underwater (about an inch should actually be in the flask) and the other end to a battery (for both flasks). if all is right, in about twelve hours, there will be bubbles in both flasks, one is oxygen, the other hydrogen.

Answer 3

This is the one my mom did all the time.

A bowl of water.
Sprinkle pepper lightly covering the water.
Hold a bar of soap in the middle.

The pepper will go to the edges of the bowl.

It's pretty cool.

Answer 4

I think the following links will definitely help you.
http://www.funsci.com/fun3_en/electro/electro.htm
the following links have easy to advanced level home experiments like preparing spineless potato to home made fire extinguisher.
http://www.spartechsoftware.com/reeko/MoreExperimentsSortCategory.htm#Atomic%20/%20Electric
http://www.spartechsoftware.com/reeko/MoreExperimentsSortCategory.htm#Chemistry