Learners view an explanation of how to read a graduated cylinder by measuring the lowest portion of the meniscus. A quiz completes the activity.

In this animated object, learners examine the formation of ester bonds in the synthesis of lipids using triglyceride biosynthesis as an example. Ester bond formation is described as a dehydration synthesis reaction.

Students identify the parts of a triple beam balance and practice measuring the mass of objects.

Learners examine a table containing the names of common cations and anions.

In this animated and interactive object, learners examine kinetic and potential energy as well as the first law of thermodynamics and the flow of energy between a system and its surroundings. Students also answer questions about exothermic and endothermic reactions

Viewers watch an introduction to monosaccharides, disaccharides, and polysaccharides. The processes for dehydration synthesis and hydrolysis.

In this animated object, learners examine the chemistry behind table salt.

Learners examine how chemists use moles to "count" atoms by weight. Examples are given.

In this screencast, we review the positions of metals, metalloids, and nonmetals in the Periodic Table and the general characteristics of each.

In this animated object, learners examine the formation of peptide bonds through dehydration synthesis.

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

Learners examine how melting, vaporization, and sublimation require energy input while freezing and condensation release energy.

In this interactive and animated object, learners use solubility rules to predict when an insoluble ionic compound will precipitate in a double replacement reaction. Step-by-step examples are given.

In this animated object, students examine what happens when electrons share molecules.

Students read different definitions of "acids" and "bases." In an interactive exercise, they identify if a substance is an acid or a base.

Vapor pressure is the pressure exerted by molecules in the gas phase in equilibrium with a liquid or a solid. Two examples are used to illustrate vapor pressure: the drying of clothes and the evaporation of ice.

In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.

In this interactive object, learners identify charges on ions, write new formulas based on charge, and balance equations using coefficients.

In this animated object, learners examine how gas volume varies directly with absolute temperature (K at constant pressure). An example of a sample of gas at two conditions of volume and temperature is used to illustrate the law.

Learners examine the meaning of oxidation, reduction, and half-reaction, and watch a film showing the deposition of copper metal from the reduction of copper (II) ion by aluminum. A brief quiz completes the activity.

In this animated object, students are introduced to moles as a measurement.

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.

Learners examine how vapor pressure is calculated. The vapor pressure of a liquid increases with increasing temperature. If the heat of vaporization and the vapor pressure at one temperature are known, the vapor pressure at a second temperature can be calculated.

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

Roman numerals are used to identify the charges on metal cations having multiple oxidation states. Five examples are provided for practice.