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It has been a few weeks since we visited the International Year of Chemistry website, so let's see what has been added.

Dow Chemical and The Franklin Institute (TFI) have uploaded three videos in what they are calling the “Celebrate Chemistry” series. I suspect they will be adding more in the future. Nothing too novel or innovative, but they have tried to make the videos child friendly.

1. Baking Soda Volcano (Recommended for grades 3-4)

2. In a video for older kids, The Science of Baseball covers the law of energy and conservation, and principles of physics.

If you are interested in the Student Chemistry Cartoon Contest and/or Student Chemistry Video Contest, you'll need to submit your entries soon. They are due May 31, 2011. The idea is to clearly illustrate a chemistry principle in way that will enhance how chemistry is taught.

If you would like to find activities being held in your region, click on the activities tab and then look for your country. There is also a search box.

Here are two examples I found:

If you live in Michigan, Spring Arbor will be featuring chemistry at their annual Cougar Science Camp June 20-24, 2011. For more details, see the Cougar Science Camp page.

On August 13, 2011 Grout Museum District in Waterloo, Iowa will attempt to break the Guinness World RecordsTM Largest Chemistry Lesson.  The lesson will start at 11:00 a.m. according to the International Year of Chemistry, but they don't have it on the museum calendar yet.

If the celebrations inspire you to do some chemistry experiments, here are 10 chemistry books to help give you ideas:

Having just put together a "chemistry day" event, I thought I'd provide some links and ideas for those of you who might want to do your own chemistry day, for those who missed our days and want to try some of the fun, or for those who want to extend the demonstrations/activities (see bottom of post).

Note: Be prepared for a mess (we did these outside). We supplied goggles, which we had purchased at a home supply store.

1. Density

Gather:

  • periodical table of the elements
  • accurate kitchen scale
  • two or more objects of the same size made of different metals, for example the zinc and copper plates from a lemon battery kit

Ask the children if they predict the two objects will weigh the same (because they are the same size). If not, can they use the periodical table to figure out which will weigh more? Use the kitchen scale to test their prediction.

The Intermediate Physical Science Kit from Exploration Education has the materials for this activity, including supplies to make your own working balance.

2. A Density Column

A density column is made of liquids of different densities layered one over another.

Gather

  • clear container (I used a water pitcher) big enough to accommodate the ladle)
  • corn syrup
  • water
  • food coloring
  • cooking oil ( I used canola)
  • isopropy alcohol (standard rubbing alcohol)
  • soup ladle
  • items to test, such as crayons, pennies, hard candies, toothpicks

density-column

Ask the children to predict which liquid is the most dense and which is the least. Pour about an inch of corn syrup in the bottom of the container. Add a few drops of food coloring to the water. Hold the ladle with the bottom resting at the top of the corn syrup layer and slowly pour in an inch or so of water. Gently empty the ladle move it up and pour in the cooking oil. Again empty the ladle, move it to the top of the cooking oil layer and gently add a layer of rubbing alcohol. You may also want to add food coloring to the alcohol layer.

Once you have a column, then test how other materials float in the layers. The pennies should be the densest and fall to the bottom. We dropped in Mentos candies, which are made of sugar and glucose syrup, and found they were roughly the same density as corn syrup. The crayons are made of wax, and floated in the oil layer. Our toothpicks were the lightest of all and floated on the alcohol.

We designed our density column based on a video at the Happy Scientist website.
We also found examples at Steve Spangler Science:
Bubbling Density Concoction
and
Seven Layer Density Column

Science is Fun in the Lab of Shakhashiri has a Layered Liquids demonstration as well.

3. Elephant's toothpaste - recommended for outdoors where messy soapsuds won't be a problem.

Gather:

  • empty plastic water bottles - enough for each child
  • hydrogen peroxide (the kind you get at the grocery store works fine)
  • baking yeast
  • water (food coloring optional)
  • dish detergent (we used Dawn)
  • funnel
  • 1/2 cup measuring cup

Using a funnel, add 1/2 cup of peroxide and a 'squirt' of dish detergent to each water bottle. In another container, mix roughly two teaspoons of yeast with about 1/4 cup water for every two bottles hydrogen peroxide (doesn't need to be perfect). If you have a lot of children, you may need two or three containers of yeast/water. Shake or stir the yeast/water, and then pour a couple of tablespoons into each bottle containing the hydrogen peroxide/dish detergent mix. The concoction should erupt in a foamy volcano. Note: this is an exothermic reaction, which means the reaction gives off heat. Allow the children to explore the foam and some may notice the warmth.

The yeast in this reaction supplies the enzyme catalase. Oxygen is rapidly released causing the foamy bubbles in the soap.

For a much more detailed recipe, see Steve Spangler Elephant's Toothpaste

4. Acids and Bases

Is it an acid or a base?

Liquids tested:

  • lemon juice
  • dish detergent
  • ammonia
  • vinegar

red-cabbage

The first day we used the standard red cabbage indicator (red cabbage leaves ground in a blender with a bit of water) but the smell was unpleasant.

The next day we used frozen mixed berries ground in the blender with a bit of water. The mixed berries smelled better, although they didn't give quite as good a range of colors.

Previous post about color and acids and bases

Steve Spangler's Red Cabbage Experiment

Science is Fun in the Lab of Shakhashiri has an Exploring Acids and Bases Demonstration

If you children are tired of the standard red cabbage indicator, try mixing a little tumeric (spice used in curries) and rubbing alcohol in a small container and then dip in strips of paper towel. Watch out, tumeric will stain like crazy! Allow the paper towel strips to dry on a newspaper.

tumeric-strips

The tumeric solution makes a lovely yellow color. Once the strips are dry, test your acids and bases again.

We found the acids did not change the color of the strips, but bases made them turn a startling red.

tumeric-strip2

We also used the tumeric/alcohol to write messages on orangy-yellow paper and after they were dry, revealed the "secret message" by lightly spraying with a household cleaning product that contained ammonia.

5. Using chemicals to make light

See Glowing Chemistry for more information

Extensions:

For the person interested in kitchen chemistry, try

Kitchen Science Activities

and Food Science 101 (the chemistry behind a simple cake)

For those interested in learning the names of the elements and their symbols:

Chemical Elements: Origins of Names Trivia Quiz

Free Rice has a chemical symbols challenge

Chemistry is great fun. Hope this inspires you to do some hands-on chemistry, too.

It's National Chemistry Week this week, from October 18–24, 2009. If you are in the mood to do some chemistry activities to celebrate, here are some helpful links.

When I found the Home Chemistry blog, I was excited because there was a post about the "Chemistry of Colored Bubbles." I have been wondering if you could make a colored bubble for ages. Now I know you can!

I think I mentioned this in a previous post, but Off the Shelf Chemistry has hands-on activities for teaching high school level chemistry with things more or less from around the house.

The home of National Chemistry Week 2009! is the American Chemistry Society. Their 2009 theme is “Chemistry—It’s Elemental!” They have a lot of resources, so plan to spend some time looking around.

About.com has a whole list of projects as well as good basic chemistry information.

Finally, Robert Krampf at the Happy Scientist has a number of chemistry experiments. Some of his experiments are free, but most require a subscription. He does have a free newsletter that has general science topics called Experiment of the Week.

And of course we have some chemistry experiments here, like Colors with Acids and Bases.

Hope you enjoy chemistry week!

If you have any great chemistry sites that I have missed, please leave them in the comments.