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Chem 110

by: Kylie Senn
Kylie Senn
Cal Poly

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About this Document

Notes on physical changes. Notes taken on the Thursday Feb.11.
Chemical Principles I
Professor lehr
Class Notes
Chemistry, physical changes, Chem 110, professor lehr
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This 1 page Class Notes was uploaded by Kylie Senn on Saturday February 27, 2016. The Class Notes belongs to CHEM 110 at California Polytechnic State University San Luis Obispo taught by Professor lehr in Spring 2016. Since its upload, it has received 40 views. For similar materials see Chemical Principles I in Science at California Polytechnic State University San Luis Obispo.

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Date Created: 02/27/16
Physical Changes Thursday, February 1112:13 PM -changes in physical properties -melting, boiling, condensation - No change occurs in the identity of the substance EX: Snow melting to puddles reactants products Key: if you have the same substance it is a physical change! Chemical changes -atoms in the reactants are rearranged to form one or more different Chemical Reaction substances -old bonds are broken; new bonds form Reactants-material we start with Products- materials we make EX: RUST Fe and O2 form rust (Fe2O3) Writing a Chemical Equation -created a new substance! -Chemical symbols give a "before and after" picture of a chem reaction Ex. Wax Melting-Physical Reactants Products Wax Burning- Chemical New substances=Ash, gases Sugar dissolving water Reactants & Products Separated by -taste like sugar-physical change. Types of Chemical Reactions Law of Conservations of Mass Combination(Synthesis) Decomposition (Reverse of Combination!) -Matter is not created nor destroyed in a chemical reaction. -Two or more reactants combined to form a single -One substance is split into two or more simpler Ex. Making a sandwich product substances -Have one type of product Cannot lose atoms! Basis for balancing Matter is Conserved nothing lost still 2 Double Replacement and 2 ! Single Replacement -two elements or ions in reactants switch places -one element or ion takes the place of another element in a reacting compound Steps in Balancing an equation ZnS + 2HCl ZnCl2+H2S -Balance all atoms except O and elements -Balance 0 Combustion -A reaction in which a compound (often carbon) Balance elements *The final balance reaction should not have fractions! reacts with oxegen producing heat *Zinc switches places with the hydrogen Ex. Balancing an equation **Don't see a number, it’s a 1! -Only write states of matter if given in the question Learning Check On Slides 1)Single Replacement 2)Double Replacement 3)Single Replacement Chem Study Guide Page 1


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