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Introduction to Chemistry

Chemistry Mole

Do you wonder what chemistry is or why you would want to study it? Take a look at answers to some basic questions about chemistry.

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Chemistry Spotlight10

What Is the Strongest Acid?

Do you know what the strongest acid is? I'll give you a hint. It's not hydrochloric acid nor is it sulfuric acid.

How Do Disposable Diapers Work? Why Do They Leak?

Learn about the polymer in disposable diapers, sodium polyacrylate. Find out how the polymer absorbs water and why diapers leak.

How Does Sunscreen Work?

Find out how sunscreen works, what an SPF rating means, the difference between sunscreen and sunblock, and how to protect yourself from both UV-A and UV-B radiation.

July 13 Science History

Learn about the history of science by reading about the significant scientific events that took place on this day in history.

Do You Burn More Calories when you Think Hard?

Find out how many calories you burn when thinking and how it compares with the energy expended by physical exercise.

Can You Use Laundry Detergent in the Dishwasher?

Yes, you could put laundry detergent in your dishwasher. Should you? Probably not. Here's why.

Does Bottled Water Go Bad?

Most bottled water has an expiration date stamped on the bottle, but does the bottled water actually go bad? If so, how long is bottled water good? Here's the answer to this common question.

How Do Mood Rings Work?

Mood rings have a stone that changes color depending on your emotions. Learn how mood rings work.

Is There a Pool Urine Detector or Pool Urine Indicator Dye?

Have you ever wondered whether there really is such a chemical as a pool urine detector or pool urine indicator dye? Such a dye supposedly clouds the water or produces a color when someone urinates in a swimming pool. Does a urine indicator really exist?

Compounds with Both Ionic and Covalent Bonds

Some compounds contain both ionic and covalent bonds. Here are examples of compounds that exhibit both types of chemical bonding.

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