Wood Tray Velvet/
/

Chemistry is an exciting subject for kids of all ages, especially if it sets up a natural discovery environment to explore safely in Let's see how do this at home with their children. In college, one of the first things you learn in chemistry class is the difference between physical changes and chemicals.

An example of a physical change that occurs when you change the shape of an object, like wadding a piece of paper. If you turn the stack of paper in the fire, now has a chemical change. You are rearranging the atoms that used to be the molecules that make up the paper into other molecules, such as carbon carbon, carbon dioxide, ash, and so on. There is an easy way to tell if you have a chemical change. If something changes color, it emits light (such as light poles around Halloween), or has absorbed heat (cold) or produces heat (heated). Some quick examples of physical changes include tearing material, material mass, stretching rubber bands, eating a banana, or blowing bubbles.

Let's do some experiments showing the chemical changes just mentioned. The installation resembles your kitchen table covered with a plastic tablecloth. On your table are several bottles of clear liquid and powder color White, along with measuring spoons and a small tray molds.

Your mission: To find the reactions that generate more heat (exothermic), absorb more heat (endothermic), which are the most impressive in their reaction (the ohhhh ahhhhh factor). NOTE: Although these substances are not harmful to skin, can make your skin dry and itchy. Wear gloves (latex or similar) and eye protection (goggles), and if you are unsure about an experiment or chemical, but do not.

Collect these before you start: a muffin cup baking tray, water, vinegar (acetic acid), sodium bicarbonate (baking sodium), soda (sodium carbonate), alcohol, hydrogen peroxide, citric acid (the supermarket), aluminum sulfate ( "alum" in section spices from the grocery store or pharmacy section of the pharmacy), and a clear liquid dish soap such as Ivory. Put all these elements on the table.

And a head of red cabbage.

Lombard? Yes! Red cabbage juice has anthocyanin, which makes it an excellent indicator for these experiments. Anthocyanin is what gives leaves, stems, fruits, flowers and colors. Did you know that certain flowers like hydrangeas turn blue in acidic soil and turn pink when transplanted to a basic soil? This next step of the experiment help to understand why. You will have to get the cabbage anthocyanins and in a more useful as an indicator of fluid "."

Prepare the indicator by coarsely chopped cabbage head pieces and boil for five minutes on the stove in a pot of water. Strain carefully all the pieces (use gauze if available) and the reserved liquid is the indicator (should be purple). By adding this indicator to different substances, you will see a range of colors anywhere from pink to tangerine orange sun yellow to emerald green to ocean blue purple velvet. Try adding drops of indicator to something acidic, like lemon juice and see how the color is different when added to a database of indicators, such as baking soda mixed with water.

Set out your liquid chemicals in easy-pour containers, like bottles of water (make sure the label, as all look the same!): Alcohol, hydrogen peroxide, water, vinegar and soap for washing dishes. (Skip the peroxide and alcohol to children.) Establish small bowls zippered bags (or if you are doing this with a crowd) of the powders with "Scoopers" made from the tops of their bottles of water: sodium bicarbonate, sodium carbonate, citric acid, ammonium nitrate, calcium chloride, and alum. The little "Scoopers" regulate the amounts you need for a muffin the size of the reaction.

Have your indicator in a bottle itself. Soy sauce bottles or other bottles with Old integrated controller that maintains the discharge to a drip is perfect. You can also use a bowl with a bulb rubber, but cross contamination is a problem. Or not – depending on whether you want children to see the effects of cross-contamination during their experiments. (Indicator bowl continually turn different colors throughout the experiment.)

The Experiment: Start mixing it up! When I personally teach this class, I let them have all the chemicals at once (even the indicator) and, of course, this leads to a chaotic mix of everything. After the excitement initial intrinsically students start asking better questions. They want to know why their cold green goo seeps into the ground with his neighbor just flowed a liquid with hot pink, apparently with the same subject. That is a system to recall what chemicals go where and with whom to get the reaction you are looking for.

Periodically hold your hand under the molds to test the temperature. Use the indicator before and after mixing chemicals and you will be surprised and dazzled by the results! Enjoy!

/
/ /
/

Since 1996, Aurora Lipper has been helping families learn science. As a pilot, astronomer, engineer, rocket scientist, and former university instructor, Aurora can transform toilet paper tubes into real working radios and make robots from junk in the back desk drawer. You can download the free science experiment workbook at http://www.SuperchargedScience.com

/
/ /
//
/Hopping Table (Top only) by Mikame – Trick
/
//
//
//
//
/
/
//
//
/
/
/ /
/[affmage source=”ebay” results=”25″]Wood Tray Velvet[/affmage]/
/[affmage source=”amazon” results=”8″]Wood Tray Velvet[/affmage]/
/[affmage source=”clickbank” results=”4″]Wood Tray Velvet[/affmage]/
/

Filed under: Uncategorized

Like this post? Subscribe to my RSS feed and get loads more!