Naked Egg

What you need:Naked Egg
• Vinegar (at least 16 ounces)
• Two glasses
• Raw egg

What you do:
• Carefully place the egg in a cup and fill the cup with vinegar so that the egg is completely covered.
• After a day of soaking you can carefully remove the egg from the vinegar.
• Depending on your particular egg, you may already have a naked egg. However, it will not hurt you fill a cup with fresh vinegar and soak the egg for at least one more day.
• After two days of soaking you should have a pretty cool Naked Egg.

HOW DOES IT WORK?

Let’s start with the bubbles you saw forming on the shell. The bubbles are carbon dioxide gas. Vinegar is an acid called acetic acid – CH3COOH – and white vinegar from the grocery store is usually about 5% acetic acid and 95% water. Egg shells are made up of calcium carbonate. The vinegar reacts with the calcium carbonate by breaking the chemical into its calcium and carbonate parts (in simplest terms). The calcium part floats around in the solution while the carbonate part reacts to form the carbon dioxide bubbles that you see.

Some of the vinegar will also sneak through, or permeate, the egg’s membrane and cause the egg to get a little bigger. This flow of a liquid from one solution through a semi-permeable membrane and into another less concentrated solution is called osmosis. That’s why the egg is even more delicate if you handle it. If you shake the egg, you can see the yolk sloshing around in the egg white. If the membrane breaks, the egg’s insides will spill out into the vinegar. Yes, you’ve made a pickled egg! Allowing the egg to react with the carbon dioxide in the air will cause the egg to harden again.

 

Pet Snails

What you need:Pet Snail
• Snails
• A good size tank (one snail per 4 liters)
• Bark
• Crushed eggshells, for calcium
• Aquarium gravel
• Soil
• Peat moss

 What you do:
• Have loose soil (no sand) for substrate. Make sure the substrate is deep enough for your snail to dig in.
• Put the soil in the aquarium.
• Provide a hiding place for your snail.( A coconut hut is good for larger snails, but a half of a hickory nut shell is perfect for smaller snails. It is recommended to get an extra hut so you have more huts than the amount of snails you have.)
• Gently put the snail in its new home.
• Feed your snail. Snails love baby carrots and lettuce, but their absolute favorite is cucumber. Feed them every day. Snails need calcium, so get crushed eggshell and let them nibble on it.
• Play with your snail. Snails love attention too! Pick them up, and let them crawl over you! Or if you have more than one, put them in a bowl with a little water, (no higher than half of the snail’s body, not shell) and let them play.

DIY Solar Oven

What you need:Solar oven
• Pizza box, shoe box or shipping box
• Marker
• Ruler
• Scissors
• Glue stick
• Black construction paper
• Aluminum foil
• Craft knife
• Bamboo skewer, stick or dowel
• Clear plastic (plastic wrap, plastic sheet protectors, or overhead transparency plastic)

What you need:s'mores
• Using your ruler, measure 1 inch from each side of your box.
• Put a dot on each side.
• Connect the dots.
• Cut three sides with a craft knife.
• Carefully pry open the flap. (This becomes your sun window. )
• Fold the window up along the uncut line (top of the box).
• Grab the aluminum foil and your glue stick.
• Use the shiny side of the foil.
• Glue the foil to the inside of your window.
• Smooth out as many wrinkles as possible.
• Repeat steps 1-4 on the inside of the box.
• Tape the black piece of construction paper on the inside of the box.
• Glue plastic wrap, plastic sheet protectors, or transparency plastic protectors to the underside of the lid. (Try to make the seal as airtight as possible).
• Take your homemade solar cooker outside.
• Place it in direct sunlight.
• Open the flap towards the sun.
• Add your favorite solar oven recipe to the box.
• Close the box.
• Use a bamboo skewer, stick, or dowel to prop the flap open.
• Choose an angle that reflects the most light into the solar box oven.
• Cook! Check your food every 10 minutes. This could take anywhere from 20 minutes to 2 hours depending on the solar oven recipe you chose and how warm and sunny it is outside.

 

Emerald Pennies

What you need:Emerald pennies
• Paper towels
• Bowl
• Pennies
• Vinegar

What you do:
• Fold a paper towel into fourths.
• Put the towel in the bowl.
•  Slowly pour vinegar into the bowl until the paper towel is completely soaked. (There shouldn’t be a puddle of extra vinegar sitting on top of the paper towel.)
• Put pennies on top of the wet paper towel.
• Wait overnight and observe.

Explanation:  The main ingredient in pennies is a metal called copper.It’s copper that gives pennies their reddish-brown color. Vinegar contains a chemical called acetic acid. When acetic acid touches copper, something new is created – a green-blue chemical called carbon acetate. In science, we call this kind of change a chemical reaction. The chemicals in the vinegar and in the copper react (change) when they are combined, making carbon acetate on the pennies.

The tops of the pennies changed color, but not the bottom. That’s because this chemical reaction can only happen if oxygen from the air around us is available.  The tops of the pennies are exposed to the air and so oxygen is available to be part of the chemical reaction. The bottoms of the pennies don’t change because they don’t have enough oxygen next to them to make the reaction possible.

 

Worm Farm

What you need:worm farm
• Sand
• Soil
• Plastic or glasss container
• Water
• Worms

What you do:
• Layer soil and sand in the container, making sure the top layer is soil.
• If the soil is dry, add some water so that the soil stays moist.
• Gather your worms.
• Add food (lettuce, egg shells, tea bags, coffee grinds, fruit peel) to the top of the container.
• Add your worms to their new home, and cover to keep dark.

Over the course of a few days, you should be able to see the worms have tunnelled; eaten their food and mixed up the sand with the soil.

Cool Science

What you need:Cool Science
• Plastic bottle
• Baking sheet
• A cup
• 2 Tablespoons warm water
• 1 Teaspoon yeast
• 1/2 Cup 6% hydrogen peroxide
• 4-5 Drops food coloring
• Squirt of dish soap

What you do:
• Set a plastic bottle in the middle of a baking sheet to catch the toothpaste.
• Mix warm water and yeast in a cupand swirl together for a minute.
• Mix hydrogen peroxide, food coloring and dish soap in your  bottle.
• Pour the yeast mixture into the  bottle…and be amazed!

The reaction is summarized by this formula: 2 H2O2  –>  2 H2O + 02.
Hydrogen peroxide (H2O2) naturally breaks down into water and oxygen.  It is stored in opaque containers to help slow down this process.  Catalase (an enzyme in all living things, including yeast) speeds up the reaction.  Dish soap catches the oxygen and makes bigger bubbles and the food coloring makes it look cool.  The foam and bottle feel warm because the reaction is exothermic -it releases energy as heat.

Balloon Science

What you need:Balloon Project
• Plastic Bottle
• Balloon
• Baking Soda
• Vinegar
• Funnel

What you do:
•Using the funnel, add the baking soda to the balloon.
• Pour the vinegar into the bottle.
• Carefully fit the balloon over the bottle opening (be careful not to drop the baking soda into the vinegar yet).
• Once the balloon is fitted snugly on the nozzle, hold up the balloon and allow the baking soda to fall into the vinegar.
• Observe the chemical reaction and effect on the balloon.
• Record observations.

DIY Squid

What you need:DIY Squid
• Balloon
• Glue Cap
• Sharpie
• Water

What you do:
•Fill the balloon with air.
• Insert the glue cap into the neck of the balloon. (closed)
• Draw squid eyes on the balloon.
• Fill a tub with water.
• Put your squid into the water.
• Twist the glue cap open and set your squid free.

Melting Snow

What you need:Melting Snow
• Snow
•  Hot water
• Kosher salt
• Sugar
•  Vinegar
• Baking soda
• Cups

What you do:
• Bring some snow home.
• Separate it into 5 cups.
• Add substances to each snow cup and note the immediate reactions. Did it affect the ice? Is it penetrating? Did it cause the ice to melt?
• Let sit for approx. 5 minutes.Melting Snow1
• Watch what happens.
• What melts the snow first?

While the snow was melting we learned about the structure of snow flakes.

DIY Slime

What you need:
• Elmer’s glue (most kinds of white craft glue will work)
• 2 disposable cups
• Food coloring
• Water
• Borax Powder
• A plastic spoon (for stirring)
• A tablespoon (for measuring)

What you do:
• Fill one small cup with water and add a spoonful of the Borax powder and stir it up. Then set it aside.
• Fill the other small cup with about 1 inch of the glue.
• Add  three tablespoons  of water to the glue and stir.
• Add a few drops of the food coloring and stir it up until mixed.
• Add one tablespoons of the Borax solution you made earlier and stir well. Watch the slime form!
• After the slime forms let it sit for about 30 seconds and then pull it off the spoon and play with it!

 Tip: Keep your slime in a tightly closed plastic bag when you are not playing with it.

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Bouncy Balls

What you need:
• 2 plastic cups
• gloves
• 2 tablespoons hot water
• 1 tablespoon white glue
• 1/2 teaspoon borax
• 1 tablespoon cornstarch
• 2 popsicle sticks
• food coloring

What you do:
• Use one popsicle stick to mix the glue with food  coloring in one of the cups.
• Use the other popsicle stick to mix the water with the borax in the other cup.
• Stir until the borax has dissolved.
• Add 1/2 teaspoon of the borax water to the glue mixture.
• Add cornstarch.
• Wait 15  seconds.
• Stir the mixture together until it stiffens.
• Mold the ball until it becomes solid.
• Play.

 

DIY Rain

What you need:
•  Jar of water
• Shaving cream
• Food coloring

What you do:
• Spray the shaving cream in the jar to resemble clouds.
• Squirt some food coloring on the shaving cream clouds.
• Wait.
• Once the “clouds” are filled with water…
• It starts to rain!