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Anne Marie Helmenstine, Ph.D.

Chemistry February 2012 Archive

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Make Sugar & String Easter Eggs

Wednesday February 29, 2012
Here's a fun Easter project for you: crystallize sugar onto string to make an Easter egg basket or a special holiday decoration. The project is similar to growing rock candy ... Read More

February 29 in Science History - Herman Hollerith

Tuesday February 28, 2012
February 29th is an extra day added to our calendar every four years. We do this because our trip around the Sun takes approximately 365 days and 6 hours. Over ... Read More

Inkless Metal Pen Writes "Forever"

Monday February 27, 2012
Back when I took nuclear physics, we had access to lead bricks used for shielding. We used the bricks for other than their intended purpose, such as building blocks, paper ... Read More

Solubility Rules for Common Compounds

Wednesday February 22, 2012
The solubility rules for common compounds are useful for preparing solutions and planning separations based on solubility. While several factors affect solubility, you can use the general solubility rules for ... Read More

Yeast & Hydrogen Peroxide Volcano

Sunday February 19, 2012
The usual science project volcano is made using vinegar and baking soda, but there are other ways to make a chemical 'volcano' for fun or to illustrate an eruption. The ... Read More

When Should You Buy High Octane Gas?

Friday February 17, 2012
Readers who follow me on Facebook may be aware that I have an unnatural love for my car and I love to fly. Both vehicles are good examples of cases ... Read More

Wordless Wednesday - Rainbow in a Glass

Wednesday February 15, 2012
This pretty rainbow density column only requires sugar, water and food coloring!

How Haircoloring Works

Wednesday February 15, 2012
Over 75% of women and a growing percentage of men color their hair. Do you know how haircoloring works? In the Beginning The first safe commercial haircolor was created in 1909 by ... Read More

How To Cook a Frozen Pizza on the Stove - Science Experiment

Sunday February 12, 2012
So, the other day I found myself in a hotel room with a frozen pizza and a stove, but no oven. I did what any hungry scientist would do. I ... Read More

Bounce a Rubber Egg

Sunday February 12, 2012
My daughter's favorite science project is making rubber eggs. You only need two ingredients for the rubber egg project, an egg and some vinegar. You'll get somewhat different results depending ... Read More

Real Periodic Table of Elements

Friday February 10, 2012
The periodic table organizes the chemical elements according to increasing atomic number, grouped by recurring or periodic properties. All periodic tables include the symbol, atomic number and atomic weight for ... Read More

10 Iodine Facts

Friday February 10, 2012
Here's an iodine fact that may be useful to you someday. While iodine is essential for proper nutrition, some people develop an allergy to the element. Usually this manifests as ... Read More

Measurement Study Guide - Learn the Basics of Measurements and Standards

Thursday February 9, 2012
Measurement is a major part of the scientific method. Observation and experimentation would be impossible without some agreed upon standard of measurement. The Measurement and Standard Study Guide is a study ... Read More

Quick Emulsifier Chemistry Demonstration

Sunday February 5, 2012
Soap is good at cleaning because it acts as an emulsifier, enabling one liquid to disperse into another immiscible liquid. While oil (which attracts dirt) doesn't naturally mix with water, ... Read More

Xylitol May Be Deadly to Dogs

Saturday February 4, 2012
Many dog owners are aware that chocolate, coffee, and grapes are toxic to dogs, but did you know about the risk from ingesting the common sweetener, xylitol? Xylitol is a ... Read More

Friday Fire Project - Fire Magic Tricks

Friday February 3, 2012
If one fire project is good, then more is better, right? I grouped together the fire projects that could be used as fire magic tricks, so you can play with ... Read More

Color Change Thermometer Project

Friday February 3, 2012
Here's a color change project that will give you a liquid that fluctuates between pink and blue as the temperature changes. What You Need beaker or attractive clear container 3 g cobalt(II) chloride ... Read More

Why People Mix Bleach and Vinegar

Wednesday February 1, 2012
If mixing bleach and vinegar releases toxic chlorine gas, then why do people do it? There are two answers to this question. The first answer is that vinegar lowers the ... Read More

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