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Tap Water, Bottled Water

The pH of the water is an indicator of the hydrogen ion concentration present in it. A pH of 0 means the solution is a strong acid; a pH of 14 means it is a strong base. If the pH is above 7.5, the wa ...

Lenz's Law: Magnet Through a Copper Tube

It is 1834, and you have just heard of this marvelous new phenomenon called eddy currents. Some fellow named Lenz discovered them, and you’re curious if you can find out something special about them y ...

Is Copper the Cure? Basic

Learn why using copper for doorknobs and other frequently touched surfaces in health-care settings may help prevent the spread of infections.

It is an educational content of CK-12 Foundation (to access ...

The Berkeley Pi? Basic

The Berkeley Pit in Butte, Montana is a remnant open pit mine and toxic waste site. The lake in the pit continues to rise, jeopardizing the aquifer that currently lies above it.

It is an educational co ...

Periodic Table Quiz

On May 31, 2012 a new element was officially named, making 114 total. How many can you name?

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Elements by 2 Most Abundance Isotopes

Enter the Elements by 2 most abundance isotopes, into the box.

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Chemical Elements with 6-Letter Names

Name all elements whose names are 6 letters long.

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Chemical Elements with Double Letters

Name all elements which contain double letters (like leTTer or bOOk) in their names.

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Elements named after places

Guess the names of the elements named after places. Only real places, mythological places don't count.

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Elements Starting with C

Enter all the Elements you know that start with the letter C!

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