Students examine atomic structure and the octet rule.

In this interactive object, learners use the ideal gas law to solve a practice problem.

Learners read the definition of atomic weight and obtain the weights of elements by viewing the Periodic Table and charts that list atomic weights by name or symbol.

Learners observe that the melting of a solid and the freezing of its liquid occur at the same temperature. The melting point is an intrinsic property and is used to identify a substance.

Students read brief descriptions of atoms, molecules, elements, and compounds, and complete a matching exercise that pictures these particles and molecules as pieces of taffy.

Learners read about endospores and view video clips demonstrating spore staining procedures. Correctly stained slides are shown.

Learners study the effect that pressure has on boiling temperatures. Once a liquid has reached a full boil, additional heat does not raise the liquid’s temperature; however, pressure can vary the boiling point of a liquid. A brief quiz completes the activity.

In this animated and interactive object, learners examine ABO blood antigens and Rh antigens and their compatibility.

The student identifies the anatomical parts of the ear and learns the purpose and function of these parts. A review follows the lesson.

Learners assign oxidation numbers to atoms in neutral compounds and in polyatomic ions. Six examples are worked through in detail, and three problems are provided.

In this learning activity you'll review the six different ways in which electricity is produced: chemical, friction, heat, light, magnetism, and pressure.

Learners examine a table of common polyatomic ions. Eight examples are provided for practice.

Students use algebra to rearrange formulas and solve for the missing volume, density, or mass quantity.

Boyle's Law states that gas volume varies inversely with the pressure at constant temperature and is described by the equation PV = constant. An example of a sample of gas at two conditions of P and V is used to illustrate the law.

In this animated learning object, students examine the life cycles of a virus.

Learners examine how five or six groups of electrons around a central atom cause the shape of the molecule to be trigonal bipyramidal, seesaw, T-shaped, linear, octahedral, square pyramidal, or square planar. Seven examples and three interactive questions are provided in this animated activity.

Students identify the various regions of the human body through drag-and-drop exercises.

Learners match diseases with their portals of entry, causative agents, and associated vectors.

Learners observe that the volume of one mole of any gas is 22.4 L at standard temperature and pressure. An illustration shows that only the mass of the molar volume differs with the identity of the gas.

Learners combine Boyle's Law and Charles's Law to solve for the pressure, volume, and temperature of a gas sample under two sets of conditions.

Learners identify combination, decomposition, displacement, and combustion types of redox reactions. They also watch a video clip that demonstrates the reaction of sodium and water.

In this learning activity you'll observe information and formulate an evaluation that includes diagnosis and microorganism identification.

In this interactive object, learners match the bacterial etiologic agent to the disease it causes.

In this interactive learning activity, learners review the terms used to describe relative position of body parts in order to have a common set of words to describe their position. Check out our video on relative position: https://bit.ly/2kTXujp

Students choose the hypothesis and practice describing bacterial colonies using the steps of the scientific method.