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Chem131 Week 8

by: Maya Silver-Isenstadt

Chem131 Week 8 CHEM131

Maya Silver-Isenstadt

GPA 4.0

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About this Document

These notes cover chapter 8
Chemistry I - Fundamentals of General Chemistry
John Ondov
Class Notes
General Chemistry
25 ?




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This 1 page Class Notes was uploaded by Maya Silver-Isenstadt on Monday October 17, 2016. The Class Notes belongs to CHEM131 at University of Maryland - College Park taught by John Ondov in Fall 2016. Since its upload, it has received 10 views. For similar materials see Chemistry I - Fundamentals of General Chemistry in Chemistry at University of Maryland - College Park.


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Date Created: 10/17/16
Week Eight 8.1) ● Carbon dioxide amounts are growing ● Greenhouse gas effects → cause global warming 8.2) ● Chemical change → atoms rearrange and transform original substances into different. Ex. burning gasoline. Properties → corrosiveness, flammability, ductility, toxicity. ● Physical → Do not change composition. Ex. boiling water. Properties → Odor, taste, appearance, melting, boiling point, density. ● Chemical changes are evidenced by temperature and color change. 8.3) ● Chemical reactions are made of reactants on the left and products on the right. ● The equations must be balancesd ● Hint** Balance the most complex substance FIRST. 8.4) ● Coefficients in a chemical equation specify the relative amounts of moles of each of the substances involved in the reaction. ● Stoichiometry→ Relationship between chemical amounts. USE RATIOS ● Mass→ moles→ moles (ratio) → mass 8.5) ● Limiting reactant, Theoretical yield, Percent Yield. ● Limiting reactant → (reagent) completely consumed and limits the amount of product ● Reactant in excess → greater quantity than is required ● Theoretical Yield → product that can be made based on limiting reactant . ● Actual Yield → Actual amount of produced yielded. (actual/theoretical)*100% 8.6) ● Combustion reaction involves a substance and oxygen (diatomic molecule) and it emits heat, water, and carbon dioxide. ● Alkali → Reacts with halogens. More heat and stronger down group 1A ● Halogens → Make (metal halides), ionic bonds, also reacts with hydrogen to make hydrogen halides… Forms covalent bonds ● Forms interhalogen bonds.


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