Free Science Projects

Create Your Own Volcanic Gas

Make Your Own Invisible Ink





 

VOLCANIC GAS

Exhibit how Volcanoes give off gas. For more in depth learning about Volcanoes and experimentation, purchase an Ultimate Volcano Science Kit from Dr. Cool!
WHAT YOU NEED:

  • Glass jar or bottle (a narrow top is best)
  • Baking Soda
  • Vinegar
  • Funnel
  • Balloon

WHAT TO DO:

  1. Add some baking soda (about a tablespoon works best) into the bottom of the jar or bottle.
  2. Place your funnel over the mouth of the jar or bottle, and pour in some vinegar (about a ¼ of a cup).
  3. Remove the funnel.
  4. Place the balloon over the mouth of the jar or bottle. Watch as the balloon fills up!  Be careful not to over inflate the balloon or it will pop!

WHY DOES IT WORK?
The mixture of baking soda and vinegar sets off a chemical reaction that causes gas to rise to the top of the jar or bottle. Once the balloon is placed over the mouth, the rising gas begins to fill and expand the balloon. Much in the same way gas is given off by volcanoes. The gases are trapped in cavities in volcanic rocks, than dissolved in magma, or released from lava that indirectly heats ground water. The gases continually travel upward within the volcano.

 


 

INVISIBLE INK

Making invisible ink is exciting. You can write secret messages to friends or pretend to be a secret agent! All you need are some basic household objects. With the special power of lemon juice and some basic items you have at home, you will be ready to write secret messages in minutes.
WHAT YOU NEED:

  • One lemon
  • Water
  • Spoon
  • Bowl
  • Cotton bud
  • White paper
  • Lamp or other light bulb

WHAT TO DO:

  1. Cut the lemon and squeeze some of the juice into the bowl and add a teaspoon (about 6 drops) of water.
  2. Mix the water and lemon juice with a spoon.
  3. Dip the cotton bud into the mixture and write a message onto the white paper.
  4. Wait for the juice to totally dry, until it can’t be seen.
  5. Now it’s time to reveal the secret message!  Heat the paper by holding it close to a light bulb, and watch as the message seems to magically appear!

WHY DOES IT WORK?
Lemon juice is a natural substance that reacts and turns brown when heated. By watering down the lemon juice, it’s tough to notice when you apply it the paper, but it will remain a secret until the message is heated.  Other materials which would also work include orange juice, honey, milk, or vinegar.