In this interactive object, learners study the properties of a trapezoid and use a geometric formula to find its perimeter and area.

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

In this animated and interactive object, learners examine the properties of liquids, solids, and gases.

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

Learners complete an exercise to match chemical formulas with the names of binary compounds, tertiary compounds, and ions.

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

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

In this interactive object, learners calculate the amount of heat evolved or absorbed in chemical reactions. Four practice problems are provided.

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

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

In this animated activity, learners read about the properties of a rectangle and its components. They then work practice problems to find the perimeter and area of rectangles.

This learning activity describes the physical properties that affect the inductance, in henries, of an inductor.

In this animated activity, learners examine the conductivity of a solution and how its properties affect measurements to determine concentration levels. A brief quiz completes the learning object.

In this animated activity, learners read about the properties of a square and its components. They then work practice problems to find the perimeter and area of squares.

The learner sees photos of the spark patterns of various materials and their related properties.

In this interactive lesson, students examine the quantitative relationship between chemicals in a balanced mathematical equation.

Learners read about lab equipment and basic safety measures. In a quiz, they view photos and determine if the lab technicians pictured are using safe practices.

In this screencast we are introduced to the lab equipment used to contain and dispense chemicals.

Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).