Sunday, June 30, 2013

Science Experiment: Dry Ice Bubble

Click the pic!
Make a Big Dry Ice Bubble
Have fun making a dry ice bubble that will
grow and grow as it fills with fog. This
experiment is a great one for adults to do
with kids. Add water to the dry ice, cover
it with a layer of soapy water and watch
your bubble grow, how big will it get
before it bursts? Give it a try and find out!

What you'll need:
  • Water
  • A large bowl with a lip around the top (a                                                                                                                   smaller bowl or cup will work too)
  • A strip of material or cloth
  • Soapy mixture for making bubbles (water and some dishwashing                                                                                                              liquid should do the trick)
  • Dry ice - one piece for a cup, more for a bowl. Places where                                                                                                                  adults can buy dry ice include large grocery stores and Walmart.                                                                                                             Butchers and ice cream stores might have some too.
Safety first! Be careful with dry ice as it can cause skin damage if not
used safely. Adults should handle dry ice with gloves and avoid directly
breathing in the vapor.

Instructions:
  1. Place your dry ice in the bowl and add some water (it should start                                                                                                         looking like a spooky cauldron).                                                                                
  2. Soak the material in your soapy mixture and run it around the lip                                                                                                                   of the bowl before dragging it across the top of the bowl to form a                                                                                                         bubble layer over the dry ice.
  3. Stand back and watch your bubble grow!

What's happening?
Dry ice is carbon dioxide (CO2) in its solid form. At temperatures above
-56.4 °C (-69.5 °F), dry ice changes directly from a solid to a gas, without
ever being a liquid. This process is called sublimation. When dry ice is put
in water it accelerates the sublimation process, creating clouds of fog that
fill up your dry ice bubble until the pressure becomes too much and the
bubble explodes, spilling fog over the edge of the bowl. Dry ice is sometimes
used as part of theater productions and performances to create a dense
foggy effect. It is also used to preserve food, freeze lab samples and even to
make ice cream! 

By Science Kids

Wednesday, January 9, 2013

Math Flash Cards

If you need to practice any of the four basic math functions, try these
flash cards by clicking on any of the buttons above. You may change
your selection at any point. Select "ALL" for variety.

Sunday, January 6, 2013

Word Problems

Word problems for all operations.

Custom Stopwatch

One of the best ways to manage your classroom is with a timer. I have found it works better to use a timer that the students can see as well. With this site you can customize your own timer to make it right for you and your students.

Sunday, December 30, 2012

Connect Sums

Click on a series of values that add up to the target sum. The next value clicked in a series must be a neighbor of the last value clicked. You can use dice, numbers, coins, or mystery blocks.

Build a Habitat

In this game you get to change the vegetation, precipitation, and other elements to create the perfect habitat for your animal. The compatibility meter lets you know how you are doing. 

Monday, December 17, 2012

Interactive Plant Parts

This site is an interactive way to see plant parts. Use it to see how different plants look, what parts of each plant can be different or similar, what parts of different plants we eat, etc.