Physical Science







Chemical changes

Chemical changes come in many forms, but we teach that there are certain clear signs that can indicate that a chemical change has taken place.  Those signs, while not always absolute proof of a chemical change, provide an excellent way…
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How Atoms Work

The idea that everything on this planet is made of matter has been around for thousands of years, as has the idea that all matter is composed of some time of smaller, indivisible particle. That theory was never really tested…
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The uses of Helium

In the United States, helium can be used for many different things. It can be used for advertising purposes, recreation, purge systems, and low-temperature cooling systems. Objects that float in the air, such as balloons, blimps, and other things of…
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