Learners follow a four-step process to determine the empirical formula of a compound from the masses of its constituent elements. The molecular formula is determined in a fifth step using the molecular weight of the compound.

In this interactive object, learners calculate formula and molecular weights by working through five examples and two problems.

In this animated object, the learner examines 17 types of joint movement.

In this animated object, learners examine water molecules moving through a semipermeable membrane.

In this animated activity, learners study how a PLC performs a shift operation. The learning object covers data movement, data entry, PLC wiring, PLC shift register introductions, and programming for a paint can operation.

In this animated object, learners examine neutral fats, phospholipids, and cholesterol. The molecular formula and general function for each are shown.

Learners calculate gas density from the standard molar volume and observe how the density increases with the increasing molecular weight of the gas.

In this well-illustrated object, learners examine the structures and properties of the four types of solids: molecular, metallic, ionic, and covalent network. Five interactive questions are provided.

In this screencast, learners examine the movement of fluid within the vascular system.

This screencast shows how blood droplets are held together by a strong cohesive molecular force that produces surface tension in each drop and on the external force. Surface tension pulls the surface molecules of a liquid toward its interior, decreasing the surface area and causing the liquid to resist penetration.

The learner will gain an understanding of the modes of axis movement for successful robot programming.

In this animated and interactive object, learners examine the basic parts and the linear movement of a hydraulic cylinder. A brief quiz completes the activity.

In this animated object, learners consider how nanoscientists are mimicking intracellular movements when building nanobots.

In this animated object, learners examine neutral fats, phospholipids, and cholesterol. The molecular formula and general function for each are shown.

Learners study the muscles of the scapula and check their knowledge on each page by identifying the muscles on diagrams and answering a related question about movement.

In this learning activity you'll review rigging and lifting as well as signals for crane movement.

The learner will view videos showing the movements of each axis of the six-axis robot.

Learners conduct an experiment to illustrate how a greater number of particles in a "vessel" increases osmotic pressure.

Students view the parts and movements of a combustion engine in this animated activity. Each part is described.

In this animated object, learners examine the different types of joints and their movements.