This module simulates the measurement of the density of a gas sample. Different gaseous compounds and elements are available and the pressure and temperature of the sample can be adjusted.

[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will define a mixture and understand why mixtures are different than pure substances. They will classify mixtures as homogeneous or...

[Free Registration/Login may be required to access all resource tools.] Many chemical reactions are going on constantly inside your body. In fact, there are probably thousands of chemical reactions occurring every second in every one of...

This lesson will discuss properties of elements and comopounds.

[Free Registration/Login Required] Discover the composition of matter and the relationship between matter, atoms, and elements. Students will learn the differences between elements and compounds, and how molecules are formed. Chemical...

Students will be able to describe elements and compounds, and explain how mixtures differ from compounds.

This section from the online textbook, "An Introduction to Chemistry", gives the steps to calculate the percent of an element in a compound. A few example calculations are shown. Also find links to chapter maps and power points for other...

A self-assessment quiz accompanying Chapter 23 of the text, Chemistry: The Molecular Nature of Matter and Change, Fifth Edition. The title of the chapter is "The Transition Elements and Their Coordination Compounds."

This Homewood City Schools site has an outline form and contains lots of information about the classification and composition of matter. Some of the topics covered are matter and temperature, changes in state, composition of matter, and...

Here you can find out about hydrogen, the first element in the periodic table. Content includes shell information, where to find it in nature, and why it is helpful to us.

Here at Chem4Kids you can find some great information about the 4th element in the periodic table, "beryllium." Content focuses on beryllium's electrons, where you can find beryllium in nature, and how beryllium combines with other...

Here you can find some great information about the 7th element in the periodic table, "nitrogen." Content focuses on nitrogen's electrons, where you can find nitrogen in nature and in the home, and how nitrogen combines with other elements.

Here you can find some great information about the 10th element in the periodic table, "neon." Content focuses on neon's electrons, where you can find neon in nature and in the home, and how neon combines with other elements.

Here at Chem4Kids you can find some great information about the 11th element in the periodic table, "sodium." Content focuses on sodium's electrons, where you can find sodium in nature and in the home, and how sodium combines with other...

Here you can find some great information about the 16th element in the periodic table, "sulfur." Content focuses on sulfur's electrons, where you can find sulfur in nature and in the home, and how sulfur combines with other elements.

Here at Chem4Kids.com you can find some great information about the 5th element in the periodic table, "boron." Content focuses on boron's electrons, where you can find boron in nature and in the home, and how boron combines with other...

Click on the left navigation terms for some great information about the 6th element in the periodic table, "carbon." Content focuses on carbon's electrons, where you can find carbon in nature and in the home, and how carbon combines with...

Here you can find some great information about the 12th element in the periodic table, "magnesium." Content focuses on magnesium's electrons, where you can find magnesium in nature and in the home, and how magnesium combines with other...

Chem4Kids looks at the 18th element in the periodic table, argon. Content focuses on argon's electrons, where you can find argon in nature and in the home, and how argon combines with other elements.

Here you can find lots of great information about helium. Learn about its electrons, where it exists in nature, and about the element itself!

This Wikipedia online encyclopedia site provides information on the element Cobalt (Co). Entry includes the characteristics, history, biological role, occurrence, compounds, isotopes, and more about Cobalt.

A video and a short quiz on the periodic table of elements and how it is organized.

This site from The Museum of Science presents some compound machines and asks students to identify which simple machines they are composed of. Students provide their answer and receive immediate feedback.

Learn how atoms are the building blocks of all living and nonliving things.