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Biology Review of Plankton 150 150 Deborah

Biology Review of Plankton

Overview Plankton include many organisms that live on near the surface of water, and float with the currents. There are types of freshwater plankton that live in lakes, while saltwater plankton live in oceans and saltwater lakes. They are at the bottom of the food chain, and are a rich source of nutrients for many…

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Biology Review of Wetlands 150 150 Deborah

Biology Review of Wetlands

Overview Wetlands are ecosystems where the land is covered by water or near water. The water may be standing or flowing slowly, or the soil may be moist enough for at least part of the year that wetland plants and animals use it as their habitat. The salt content of the water is important to…

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Chemistry Review of Substances and Mixtures 150 150 Deborah

Chemistry Review of Substances and Mixtures

Overview Substances occur in elements or compounds, while mixtures can be any combination of one or more elements or compounds. Mixtures may occur as solutions or heterogeneous combinations. Elements and Compounds Elements and compounds are known as pure substances. A molecule of one of the elements or compounds only contains that substance. For example, a…

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A Chemistry Review of Gold 150 150 Deborah

A Chemistry Review of Gold

Overview The element gold (Au) has atomic number 79. It is a soft yellow metal, with the properties of metals. It doesn’t react with other elements easily, but forms alloys easily, with silver, copper, palladium, and other metals. It is a precious metal, with a long history in coins and jewelry. The properties of gold…

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Review of Alchemy to Chemistry 150 150 Deborah

Review of Alchemy to Chemistry

Overview Before there was a science of chemistry, there was alchemy. It was practiced in China, India, Mesopotamia, and Europe. The alchemists from ancient times performed experiments to transform base metals, such as lead, to precious metals, such as gold. Some of the side products of their quest included the development of scientific inquiry and…

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Chemistry Review of the Heaviest Elements 150 150 Deborah

Chemistry Review of the Heaviest Elements

Overview Over the centuries, the number of elements has changed as new elements have been discovered.  Some unstable, heavy elements  have only been synthesized in atomic laboratories, so very little is known about them. The Number of Elements Changes The chemist Lavoisier listed 23 elements in 1789. Mendeleev arranged 63 elements in the first periodic table in…

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Chemistry Review of the Classification of Matter 150 150 Deborah

Chemistry Review of the Classification of Matter

Overview The part of chemistry that deals with matter is concerned with the world of objects that have mass and take up space. A material object may be in solid, liquid, or gaseous form; consist of pure substances or mixtures of pure substances; contain elements or compounds; and may be composed of metal, nonmetal, or…

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Science Review of the Ocean Zones 150 150 Deborah

Science Review of the Ocean Zones

Overview The ocean zones are divided according to their distance from the shore and the depth of the ocean. The area closest to the shore includes the intertidal zone and the coastal ocean. The open ocean is further away from shore and is the largest area. Finally, the deepest parts of the ocean are in…

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Math Review of Quotients Involving Radical Expressions 150 150 Deborah

Math Review of Quotients Involving Radical Expressions

Overview In order to divide rational expressions accurately, special rules for radical expressions can be followed. Some of those rules include the quotient rule, rules for finding the square roots of quotients, and rationalizing the denominator. The Quotient Rule Suppose the problem is to evaluate the square root of 36/49. The problem can be written…

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Review of Mathematical Patterns in Art, Music, and Dance 150 150 Deborah

Review of Mathematical Patterns in Art, Music, and Dance

Overview Mathematical patterns underlie everything in the natural world, including those human extensions of the natural world that surround us. Some of those mathematical patterns are expressed in the arts, including visual arts such as painting and sculpture, and the physics and mathematics of music. Other mathematical patterns are expressed in performance arts, such as…

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