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Introduction to Chemistry

An atom consists of a nucleus of protons and neutrons surrounded by a cloud of moving electrons.

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

Rules for Assigning Oxidation Numbers

Learn how to assign oxidation numbers to keep track of the distribution of electrons during a chemical reaction.

July 29 Science History

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

July 30 Science History

Learn about the history of science by reading about the significant scientific events that took place on July 30 in history.

How To Grow Bismuth Crystals

Bismuth is one of the easiest and prettiest metal crystals that you can grow yourself. The crystals have an interesting geometric hopper form and are rainbow-colored from the oxide layer that quickly forms on them. Try these step-by-step instructions for growing bismuth crystals.

What Is Mylar?

You may be familiar with Mylar in shiny helium-filled balloons, solar filters, space blankets, protective plastic coatings or insulators. Here's a look at what Mylar is made of and how it is made.

Turn Water into Liquid Gold

Mix two clear solutions, wait, and watch the liquid turn to gold! This is a simple alchemy project or chemistry demonstration, based on early attempts to make gold from base metals.

Toxic Chemicals from Peeing in the Pool

Learn about the toxic chemicals produced by urine in treated swimming pool water.

How to Make Pure Sand

Sand that you find on a beach or a playground is a mixture of minerals and organic matter. Pure sand, which is silicon dioxide or silica, is a chemical you can make. Here's what you do.

Why Are Shark Teeth Black?

Usually when you see shark teeth they are black, yet teeth in living sharks are white. Here's the explanation behind why shark's teeth turn black.

Acids and Bases Definitions

Understanding acids and bases is important for grasping chemistry concepts. Here's an introduction to acids and bases, with definitions for key acid and base terms.

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