<meta http-equiv="refresh" content="1; url=/nojavascript/"> Matter | CK-12 Foundation
Skip Navigation
You are reading an older version of this FlexBook® textbook: CK-12 Physical Science Concepts For Middle School Go to the latest version.

Chapter 2: Matter

Difficulty Level: At Grade Created by: CK-12


What do think this picture shows? Here’s a hint: This illustration mimics a photo taken with a special microscope that makes images of things that are extremely small. In fact, the gray spheres in the image represent things so small that trillions of them would fit inside the period at the end of this sentence. Each gray sphere is an atom of lead. Do you know what atoms are? They are the basic building blocks of matter. Matter, in turn, is all the “stuff” in the universe. In this unit you will learn much more about matter—from things as simple as atoms to as complex as you!

Chapter Outline

Chapter Summary


This unit defines matter and describes its properties. It compares elements, compounds, and mixtures. It explains how matter changes state and identifies special properties of gases. The unit also delves into atoms and elements, including how elements are classified.

Image Attributions


Difficulty Level:

At Grade



7 , 8

Date Created:

Jul 19, 2013

Last Modified:

Dec 29, 2014
Files can only be attached to the latest version of None
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original

Original text