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Chemistry Feature Articles

Anne Helmenstine's Most Recent Content

By Anne Marie Helmenstine, Ph.D., About.com

The blue glow is characteristic of luminol chemiluminescence.

You can use luminol to make your own glowstick or to test for blood.

David Mülheims, Wikipedia Commons
Most Recent Features...

08/24/08 - Halloween Science Projects
Are you ready for some spooky science? These projects and experiments are just right for Halloween. Make your holiday educational as well as fun!

08/23/08 - Mad Scientist Theme Party
A mad scientist party is a fun and educational party theme, ideal for birthdays and Halloween. Get ideas for invitations, decorations, costumes, food and drink, cakes, mad scientist experiments and games, as well as party favors for guests to take home.

08/21/08 - Which Mad Scientist Are You?
If you were a famous mad scientist, which mad scientist would you be? Take this fun multiple choice quiz to find out.

08/19/08 - Element Picture Quiz
Can you recognize the elements when you see them? Here's a quiz that tests your ability to identify an element based on its appearance.

08/17/08 - Hazard Symbol Quiz
This fun multiple choice quiz tests your recognition of lab safety signs and symbols. If you fail this quiz you might want to avoid the chem lab until after you have reviewed the meanings of the signs.

08/06/08 - Aufbau Principle & Electronic Structure
Stable atoms have as many electrons as they do protons. How do these electrons orient themselves around the nucleus? They fill their electron orbitals by the aufbau principle.

08/06/08 - Types of Chemical Bonds
Learn about the different types of chemical bonds and the forces that affect the way electrons are shared.

08/04/08 - Types of Chemical Reactions
Learn about the different types of chemical reactions and get examples of the reaction types.

08/02/08 - Glowing Water
It's really easy to make glowing water that you can use as glowing water or as a glowing ingredient in other water-based projects.

08/01/08 - Which Element Are You?
Which chemical element are you? Technically speaking, you mostly consist of carbon, hydrogen, and oxygen, but which element best represents your personality? Take this fun multiple choice quiz to find out.

07/29/08 - Glowing Jell-O Recipe
It's incredibly easy to make Jell-O or other gelatin glow under a black light. Here's what you do.

07/26/08 - Titration Curves
Titration is a technique used in analytical chemistry to determine the concentration of an unknown acid or base. For all acids, the shape of the graph plotting pH against volume of base titrated fits the same general shapes.

07/24/08 - Quantum Numbers & Electron Orbitals
Chemistry is mostly the study of electron interactions between atoms and molecules. Understanding the behavior of the electrons in an atom is an important part of understanding chemical reactions.

07/23/08 - Magic Colored Milk
If you add food coloring to milk, not a whole lot happens, but it only takes one simple ingredient to turn the milk into a spinning color wheel.

07/17/08 - Glowing Bubbles
Bubbles are already awesome, but glowing bubbles are even better. It is easy and safe to make bubbles glow, plus it doesn't require any hard-to-find materials. Here is what you do.

07/12/08 - How to Remove Rust Stains
Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles, plus some treatments actually set the stain rather than remove it. Use a little chemistry know-how to successfully remove a rust stain.

07/09/08 - How to Remove Ball Point Pen Ink
Ball point pen ink is not a something that you can usually remove with simple soap and water, but there is an easy and inexpensive way to remove pen ink from surfaces or clothing.

07/05/08 - Honeycomb Candy Recipe
Honeycomb candy is an easy-to-make candy that has an interesting texture caused by carbon dioxide bubbles getting trapped within the candy.

07/04/08 - Table of Physical Constant
Need a value for a fundamental physical constant? This handy reference table contains commonly used physical constants used in chemistry.

07/01/08 - English to Metric Unit Conversion
Here is a worked example of how to convert English to metric measurement units using the unit cancellation method. This example converts yards to meters.

06/29/08 - Unit Cancelling Example
Here is a step by step example of a conversion between metric units. This illustrates how to cancel units to convert measurement units.

06/26/08 - Rubber Egg & Chicken Bones
You can make a hard boiled egg bounce like a rubber ball and cause chicken bones to become soft and rubbery. All you need is a common kitchen ingredient.

06/25/08 - Robert Hooke Biography
Robert Hooke has been called the English Da Vinci. He is credited with numerous inventions and design improvements of scientific instrumentation. He was a natural philosopher who valued observation and experimentation.

06/25/08 - Caffeine & Typing Speed - Science Fair Projects
The purpose of this science fair project is to determine whether caffeine affects typing speed.

06/24/08 - Fizzy Potion Recipe
Make a non-toxic fizzy Mad Scientist potion using ingredients from your kitchen. The potion looks evil, but it is safe enough to drink.

06/22/08 - Safe Smoke Bomb
A classic smoke bomb is easy to make and safe to use, but you can make the project even safer if you don't heat the ingredients. Here's what you do.

06/20/08 - Why Is lb the Symbol for Pounds?
Have you ever wondered why lb is used as the symbol for the pounds unit? Here's the answer to the question.

06/19/08 - Derived Metric Units
Many metric units used in science have specialized names for the values they represent. They are considered derived units and can still be reduced to factors of the seven base units. This table lists many of these units and their corresponding base unit values.

06/19/08 - Metric Base Units
The metric system or SI (from Le Système International d'Unités.) is based on seven base units. These units describe the basic properties on which all other measurements are based.

06/18/08 - Greek Alphabet
The Greek Alphabet is used extensively in science and mathematics to represent variables and symbols. This table lists all twenty four Greek letters in upper and lower case. Learning the names of these letters is easy and you may be surprised you already know many of them.

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