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Evan Silberstein
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United States - New York - Nanuet
Evan Silberstein
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Moles seem mysterious to many secondary students. Avogadro's number is one of the culprits. Although it is possible to do a slew of factor label problems with Avogadro's number, it is not the primary value of the mole concept in chemistry. This
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Electron configurations come in several varieties: Bohr notation; sublevel notation; and orbital notation. This PowerPoint show explains the energy considerations for electron placement and develops a model to determine the order of filling. This
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3.9
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Chemical reactions follow four basic patterns: Synthesis; decomposition; single replacement; and double replacement. This Powerpoint presentation describes, explains, and helps students to recognize these basic reaction types. Free worksheets for
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This Powerpoint presentation focuses on the nature of covalent bonding. It provides the tools to determine bond type by using electronegativities. The differences between polar and nonpolar covalent bonds is discussed. Free worksheets on this topic
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This Powerpoint presentation explores the relationship between heat and temperature. It develops the equation q = m C ΔT, where q is heat, m is mass, C is specific heat capacity, and ΔT is the temperature change. The presentation explains the logic
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The localized electron model uses Lewis structures to predict molecular shapes. Lewis structures show the bonds and lone pair electrons of a molecule. A line is used to represent each bond and dots are used to represent the electrons. This
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Hybrid orbitals are the localized electron model's approximation of molecular orbitals. As a result, hybridization theory is essentially VSEPR in new clothes. As with VSEPR, predicting molecular shape and the type of hybridization is a matter of
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This presentation uses a novel approach to help students easily figure out how to convert to and from scientific notation. It also helps the students develop rules for calculating with scientific notation. Don't forget to go to my website for the
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Are the electrons really moving in circles? Bohr was unable to explain why his proposed orbits were stable. Even worse, Bohr could only explain the line spectrum of hydrogen. This PowerPoint starts with Bohr's flaws, and explores DeBroglie,
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Atoms are attracted to each other because they are made of charged particles. An atom's protons not only hold onto its own electrons, they also tug on the electrons of other atoms. This Powerpoint presentation explores the tug of war over valence
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When it comes to covalent bonding, "sharing is pairing." Drawing electron dot diagrams is one way to see where the unpaired electrons are. It also mirrors the orbital notation for the valence shell. This presentation explains the logic and rules
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VSEPR (Valence Shell Electron Pair Repulsion) sounds complicated, but actually it's as simple as counting from 2 to 6. Truthfully, there are a few considerations to correctly count the number of electron pairs surrounding the central atom, but once
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3.8
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This Power Point presentation answers the question, "How many decimal places do we need to carry this out to?" It explains the need for significant figures by pointing out the ridiculousness of digits in calculations that go way beyond the precision
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A chemical change is any change that results in the formation of new substances. Chemical changes are accompanied by physical changes. This makes it difficult, at times, to tell when a chemical change has occurred. This Powerpoint presentation
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Most high school students have seen chemical equations, but it is still necessary to review the format and symbolism of chemical equations before students can begin more advanced work with them. This Powerpoint presentation examines, the format and
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The first step to doing more complex stoichiometry problems is to learn to work with mole ratios. This Powerpoint presentation helps students to understand the relationship between the coefficients of a balanced equation and the mole ratios of the
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Gases spread out to fill their containers. Students can't normally see this. But iodine sublimes to form a purple gas so students could see it filling a covered beaker as it is heated. This Powerpoint presentation has animations showing this and
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The distinction between a compound and a mixture is that in a compound, the components are chemically combined, while in a mixture they are not. But what does that mean. This Power Point presentation compares and contrasts mixtures and compounds so
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Before writing chemical formulas, students need to know how to interpret them. What do all the various symbols and numbers mean. This Powerpoint presentation explores concepts such as subscripts, coefficients, polyatomic ions, parentheses, and the
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During chemical reactions, mass is conserved. This is because no atoms are created or destroyed, rather they are rearranged. A chemical equation needs to show conservation of mass. The number of each type of atom needs to be the same on both sides
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Ask Evan Silberstein a question. They will receive an automated email and will return to answer you as soon as possible. Please Login to ask your question.
TEACHING EXPERIENCE

Taught biology, chemistry, and general science in the East Ramapo Central school District, Spring Valley, NY from 1970 to 2003. Teach chemistry at the Frisch school, Paramus, NJ since 2003

MY TEACHING STYLE

I teach using the smart board and power point presentations. My lessons depend heavily on questioning and student responses. Lessons generally include activities and/or demonstrations with work sheets for follow up. All of my work sheets correlated to my power point presentations, and are available free of charge on my web site: http://www.evanschemistrycorner.com .

HONORS/AWARDS/SHINING TEACHER MOMENT

Yet to be added

MY OWN EDUCATIONAL HISTORY

B.S.: 1970 SUNY at Stony Brook M.S.: 1973 SUNY at New Paltz Post Graduate: Hebrew University, Jerusalem NYU, New York, NY Iona College, Rockland Campus, Orangeburg, NY

ADDITIONAL BIOGRAPHICAL INFORMATION

Writer and contributing writer for D.C. Heath and Prentice Hall science texts and ancillaries.

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