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#### Proofreading for Parallel Structure on the SAT and ACT

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Overview:  What Is Parallel Structure? Parallel structure in writing is a refinement technique in which verbs, subjects, and clauses are made similar.  It is tested on the ACT and SAT in grammar questions, as it is a feature that adds impact to writing.  Often, phrases that mean the same may not be parallel. Checklist:  Are…

#### Stoichiometry: Dealing with Excess and Limiting Reactants

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Overview: In many chemical reactions there is an excess reactant a limiting reactant. The amount of product produced is determined by the stoichiometric calculations using the amount of limiting reactant present in the reaction. This means that not all of the excess reactant is used up during the reaction since there is no more of…

#### How to Calculate Work Done by a Force

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Work is the energy applied to an object as it moves some distance. The amount of work done is directly proportional to the magnitude of force applied, as well as the displacement of the object. In some cases, there may be an angle between the direction of displacement and force vector. The force must be…

#### How to Prepare a Solution of Proper Concentration

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Overview: When in a chemistry lab or just writing a test, many students struggle with how to create a solution of known concentration. Students find it difficult because they try to calculate the solution in terms of moles, which is a unit that cannot be measured in the lab. There are some easy to follow…

#### Newton’s Three Laws of Motion

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Overview: Sir Isaac Newton is well-known for his work on creating the three laws of motion based on the theories of previous scientists as well as his own speculations. These 3 simple, intuitive laws lay the foundation for the basics of classical, Newtonian mechanics. The following are Newton’s three laws in more detail: 1. Newton’s First…

#### Who’s Afraid of the Normal Curve?

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Overview:  What Is the Normal Curve? The normal curve is a frequency distribution with special statistical properties.  The best-known application of the normal curve is the distribution of intelligence as measured by tests such as the Stanford-Binet, but there are other examples  that are close to the normal curve in human and animal behavior.  Biologists,…

#### Diffusion, Osmosis and Osmotic Pressure

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Diffusion is the net movement of molecules because of a difference in the chemical potential or concentration between two regions. Molecules move faster when the difference/gradient is larger. Molecules tend to move to the region where their chemical potential or concentration is lower.   Osmosis is the diffusion/movement of water through a cell membrane. Since…

#### DNA Repair Mechanisms

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We have very good DNA machinery that replicates DNA to make many different copies. However, this machinery in our cells is not perfect. With so much DNA replication going on, there are bound to be some mistakes and errors made during this process. These errors lead to mutations and if not corrected, it may be…

#### Monomials, Binomials and Polynomials

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When dealing with differing kinds of Polynomials, there are several varieties. Today we will explore a few different variations, and break down the simple formula for naming them. A monomial is the product of non-negative powers of variables. A monomial has no variables in its denominator and will only have one term. For example: 13,…

#### Form and Structure: The Basics

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Structures are everywhere around us, be it the building keeping us dry from the rain, or the chair keeping us from falling to the ground. Even the cup you drink from is a type of structure! There are three different fundamental types of structures: shell, frame, and solid. Shell Shell structures are supported by their…