Metabolic Pathways (Screencast)
By Elizabeth Yoon
In this screencast, learners categorize different metabolic activities as catabolic or anabolic and follow a glucose molecule through the processes of glycolysis, aerobic respiration, and fermentation.
Melting Point and Freezing Point
By Debbie McClinton, Dr. Miriam Douglass, Dr. Martin McClinton
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.
Macroscale vs. Nanoscale
By Karen Nordell
In this colorful, interactive object, learners examine how materials on the nanoscale compare with those on the macroscale. The focus is on the difference between macroscale and nanoscale gold in both color and melting point.
Glucose Metabolism for the Endocrine System (Screencast)
By Barbara Liang
In this screencast, learners read about the seven hormones that help regulate blood glucose.
Golder Finches Get the Girls
By Andrea Huntoon
Explore how a goldfinch interacts with its environment and how it's affected by environmental changes.
Title: Good Starts
Artist: Jingle Punks
By Jill Larson
In this animated object, students examine the role equilibrium plays in everyday life. Formulas are presented in an interactive way.
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.
Superficial Skeletal Muscles (Screencast)
By Gerald Heins
In this screencast, learners read descriptions of the actions of the superficial skeletal muscles and see their locations.
How Pressure Changes Boiling Temperature
By Terry Bartelt, Terry Fleischman
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.
Absolute Zero Temperature
By Dr. Miriam Douglass, Dr. Martin McClinton
Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.
Carbohydrate Digestion (Screencast)
By Wendy Dusek
In this screencast, learners examine the steps of carbohydrate digestion.
A Biological Example of Water Solubility
In this animated object, students examine the role that the solubility of water plays in various biological functions.
Gas Volume vs. Temperature (Charles's Law)
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.
Conversion Between Mass and Moles of an Element (Screencast)
Atomic weights are used to convert the mass of a sample into the number of moles of the element in the sample and vice versa. Four examples are provided for practice.
What Is Torque? (Screencast)
By Terry Bartelt
Learners read a description of torque and study the factors that cause its magnitude to change.
The Solid State
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.
The Upper and Lower Motor Neurons (Screencast)
In this screencast, learners examine the function and location of the motor neurons and the damage that can result when they are injured.
Helpful Microbes in Your Daily Life (Screencast)
In this screencast, learners read how microbes in such items as yogurt, bread, insulin, and insect sprays improve our lives.
Learners view an animated presentation showing how the pH level of a cleaning solution is controlled in a closed-loop system in a manufacturing setting. A quiz completes the activity.
Standard Molar Volume
By Dr. Miriam Douglass
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.
Pressure and Boyle's Law
Students examine standard pressure in this interactive object.
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).
Nervous and Epithelial Tissue
In this colorful, interactive object, learners examine nervous and epithelial tissue composition and function. A quiz completes the activity.
The Juxtaglomerular Apparatus (Screencast)
By Becky Polk-Pohlman
In this animated and interactive object, learners examine the location, structure, and function of the juxtaglomerular (JG) apparatus.
Oxidation States of Ions
Learners examine the periodic table to identify metallic elements that have either fixed or variable oxidation states.