Provides some common examples of chemical reactions, e.g., in respiration, rusting, and photosynthesis.

Explains the definitions of basic and applied research and what the differences are between them. Provides examples of what they look like in different disciplines.

Explains the term cultural hegemony and how it was constructed by the Marxist philosopher Antonio Gramsci. Examples of its manifestation in mass media, education, religion, and other areas are given.

A short explanation of how a catapult works and some examples of them.

Describes the processes that cause the formation of waterfalls, examples of waterfalls around the world, and the different types.

Explains what is meant by the deposition of sediments by wind and water and provides examples of the resulting landforms.

Discusses the confusion around what is meant by organic chemistry and provides a list of organic compounds organized into categories and types.

Describes five different types of decomposers that feed on decaying organic matter in the oceans and that are at the bottom of the ocean food chain.

Explains what a physical change is and gives examples. The difference between a physical and a chemical change is also discussed.

Gives the definition of a vernacular region, one of the three main types of geographical regions, along with examples.

Explains how to calculate the volume of a trapezoidal prism and models how to solve example problems.

Presents the formula and an example showing how to find the cross-sectional area of a cylinder. In this case, it is the same as the surface area for the circular faces.

Explains what a bromine test is, the chemistry behind it, what it is used for, and gives examples of bromine test strip brands that are used for test the water in swimming pools and at spas.

Explains what acids and bases are and some of their properties, and gives examples of acid-base reactions.

Explains the process of copper oxidation, the chemical reactions that are involved, and gives examples of oxidation occurring. Includes the steps for an activity where you can try oxidizing copper at home, and describes how to prevent...

Explains the processes of osmosis and diffusion using labeled illustrations, discusses how they occur and gives examples.

Explains what thermoplastics and thermosets are, their properties, and their advantages and disadvantages. Provides lots of examples for each of how they are used in everyday life.

Explains what a homogeneous mixture is, gives examples, and discusses some ways used to separate homogeneous mixtures.

Explains what the four different types of number systems are and what they are used for. Presents the formula used to convert octal numbers into decimals and models how to apply it in two example problems.

Explains what is meant by axial load and how it is calculated. Includes a labeled diagram and an example problem.

The definitions of transparent, translucent, and opaque can be found here. The article explains how the density of a material and its ability to absorb light determine which of these three properties it has. A list of examples is given...

Explains vocabulary used when talking about the yield of a chemical reaction and models how to calculate the theoretical and the percentage yield in an example problem.