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

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.

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

Learners examine the periodic table to identify metallic elements that have either fixed or variable oxidation states.

In this animated lesson, learners read about the disulfide bond, the second strongest chemical bond in the hair. This bond can only be altered by chemicals.

In this animated object, learners examine the properties of the peptide bond and how the bond relates to the structure of hair.

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

In this animated object, learners examine how the heating or cooling steps in a manufacturing process work to control a chemical reaction.

In this animated object, learners examine the kinds of physical and chemical changes that occur in substances. They practice identifying examples of each.

Choose the correct word or definition of the terms.

Element Symbols 1-20

Test your recognition of science lab equipment