Learners examine the method for calculating the atomic weight of copper from the natural percent composition of each of its two isotopes.

In this learning activity you'll relate statistics on aging in America to the functions and dysfunctions created by these demographic changes.

This learning object offers a brief summary of the impact of nanotechnology on automobile tires. Learners look at the future of cars, especially the safety and future of automobile tires.

Learners examine the properties of a triangle and work practice problems to find a triangle's perimeter and area.

In this screencast, we'll review the role of significant others in the development of the self-concept

Explore the Microsoft Office Suite, which is so much more than just email.

In this interactive and animated object, students distribute the valence electrons in simple covalent molecules with one central atom. Six rules are followed to show the bonding and nonbonding electrons in Lewis dot structures. The process is well illustrated with eight worked examples and two interactive practice problems.

In this learning activity you'll arrange words from abstract or general language to specific language.

Learners read a brief description of the vertebral column and examine the distinctive features of the cervical, thoracic, and lumbar vertebrae.

In this learning activity you'll discover how the visual perception concept influences your understanding of ambiguous figures.

Students read about the phenomenon of people trying to do their best to be good subjects when participating in research.

In this learning activity you'll discover how the concept of unstable figures influences your perception of an image.

Students review the rule for pluralizing nouns ending in the letter "o." They then complete an exercise.

In this learning activity you'll test your knowledge of the roles and differences between the two Houses of Congress - the Senate and the House of Representatives.

Learners follow the step-by-step process the U.S. Government uses for creating the federal budget. The topics of budget surpluses and deficits and the federal deficit are covered.

Learners view several movie clips that demonstrate the use of an indicator to follow the neutralization reaction that occurs when an acid and a base are mixed. Students test their knowledge in a series of questions. Immediate feedback is given.

In this learning activity you'll review the facts and interpretations, determine a verdict, and respond to questions.

In the interactive object, learners examine the structural-functional, social-conflict, and symbolic interaction analyses of race and ethnicity. Learners also answer multiple-choice questions.

In this learning activity you'll identify and calculate the area under the normal curve specified by given z-scores.

Learners test their knowledge of the framework of the U.S. government in this 13-question quiz.

In this learning activity you'll review the facts and interpretations, determine a verdict, and respond to questions.

In this learning activity you'll describe inflation, its causes, and the negative consequences of it.

In this learning activity you'll construct and label a graph.

Learners study the properties of a cube and use geometric formulas to find volume and surface area.

The student reads definitions of four basic assimilation patterns in American society and creates a model for each by clicking and dragging building blocks. The student also writes a brief explanation of each new model.