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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.

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.

Copper Facts

Get periodic table facts on the chemical and physical properties of the element copper.

July 28 Science History

Learn about the history of science by reading about the significant scientific events that took place on July 28 in history.

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