151F09_W14_LV_stoich_full_post

151F09_W14_LV_stoich_full_post - General Chemistry CHEM 151...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 14
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UA GenChem Different Types of Chemical Equations Global (MOLECULAR) equation – a chemical equation showing the complete, neutral formulas for every compound in a reaction. TOTAL IONIC equation – is a chemical equation showing all of the species as they are actually present in solution. NET IONIC equation – is an equation showing only the species that actually change during the reaction .
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UA GenChem Let’s Review PRECIPITATION RXN – A reaction in which a solid, insoluble product forms upon mixing two solutions. Pb(NO 3 ) 2(aq) + Na 2 S (aq) PbS (s) + 2NaNO 3(aq) COMBUSTION RXN – a chemical reaction in which a substance combines with oxygen to form one or more oxygen-containing compounds; the reaction often causes the evolution of heat and light in the form of a flame. CH 4 + O 2 CO 2 + H 2 O
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UA GenChem Let’s Review ACID/BASE Reaction: STRONG ACID - STRONG BASE Net Ionic Equation Water Formation H + (aq) + OH - (aq) H 2 O (l) WEAK ACID - STRONG BASE STRONG ACID – WEAK BASE A weak acid + a strong base will always yield a negatively charged product (BASIC) A strong acid + a weak base will always yield a positively charged product (ACIDIC)
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UA GenChem Let’s Review ACID/BASE EXAMPLES: STRONG ACID - STRONG BASE WEAK ACID - STRONG BASE STRONG ACID – WEAK BASE Na OH (aq) + H Cl (aq) Na Cl (aq) + H 2 O (l) CH 3 COOH + LiOH CH 3 COO - + H 2 O NH 3 + HCl NH 4 +
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UA GenChem Amounts in Chemical Reactions . We have learned to IDENTIFY different types of chemical reactions. But another important aspect of reactions is the question: How Much? We will look at this on both the microscopic and macroscopic levels.
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UA GenChem During a chemical reaction chemical bonds are broken and new bonds are formed. The chemical nature of the substances present in the system changes. Chemical Reactions Microscopic Representation O 2 SO 2 Reactants SO 3 Products 2 SO 2 (g) + O 2 (g) 2 SO 3 Chemical Equation
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UA GenChem Chemical Equations The chemical equation that corresponds to the following microscopic representation: X Y We write X 2 + 2 Y 2 2 XY 2 (simplest whole numbers) We see 2 X 2 + 4 Y 2 4 XY 2
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UA GenChem Chemical Equations Write the balanced chemical equation that corresponds to the following microscopic representation: X Y We write 3 X 2 + Y 2 2 X 3 Y We see 6 X 2 + 2 Y 2 4 X 3 Y we write the simplest whole number ratio Divide each coefficient by 2
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UA GenChem Chemical Equations X Y 3 X 2 + Y 2 2 X 3 Y Count the number of X and Y atoms on both sides. Count the number of MOLECULES on both sides Total of each atoms does not change Total number of molecules can change and often does
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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151F09_W14_LV_stoich_full_post - General Chemistry CHEM 151...

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