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This 3 page paper answers basic science questions about chemical reactions and strengths of materials. Bibliography lists 5 sources.
Page Count:
3 pages (~225 words per page)
File: D0_HVSciQue.rtf
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an endothermic reaction? Purdue University defines an endothermic reaction as "a chemical reaction or physical change that occurs with the absorption of heat" (Endothermic reaction). Melting ice clearly fits this
description, since the matter in its original state (ice) undergoes a physical change (it melts into water) as it absorbs heat. In what sense are oxidation and reduction reactions opposites?
Oxidation and reduction reactions are referred to as "redox reactions" and are defined as "a family of reactions that are concerned with the transfer of electrons between species" (Redox reactions,
2006). These two types of reactions are a "matched set"-its not possible to have an oxidation reaction "without a reduction reaction happening at the same time" (Redox reactions, 2006). In
addition, "oxidation" refers to "the loss of electrons," and "reduction" refers to "the gain of electrons" (Redox reactions, 2006). Therefore, if they are linked so that one triggers the other,
and one is a loss and the other a gain, they are therefore opposite reactions. When is an electron a valence electron? In order to answer this its important to
remember that atoms are composed of various energy levels (Chemical bonding). Niels Bohr described the atom in 1915; his definition has been surpassed by quantum mechanics but he gave us
the model thats still familiar to most of us: a nucleus with electrons orbiting it: the familiar symbol we use to indicate radiation. More modern thinking has abandoned the idea
of electrons in orbit for the above-mentioned energy levels; valance electrons are the electrons located in "the highest occupied energy level of an atom" (Chemical bonding). Why are valence electrons
important in chemical reactions? Valence electrons determine what kind of chemical reactions will take place, or if they will occur at all (Chemical bonding). Elements tend to want to reach
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