103_7 - Dr. Littles Learning Goals for Lab 7 Understand how...

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Dr. Little’s Learning Goals for Lab 7 • Understand how to interpret evidence of a chemical reaction • Be familiar with the 5 types of reactions and some examples • Be able to write the products of a chemical reaction, given some hints, and using knowledge of what was observed • Balance chemical reactions
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Chemical Reactions • A chemical reaction is a recipe for making a chemical PRODUCT(S) from ingredient REACTANT(S) in the right proportion from the COEFFICIENTS: 4 Fe (s) + 3 O 2 (g) 2 Fe 2 O 3 (s) reactants product(s) coefficients subscripts phase
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Homogeneous reaction - Reactants and Products in the same phase Heterogeneous reaction - Reactants and Products different phases
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Balancing Chemical Reactions Atoms CANNOT be created nor destroyed. So, in a chemical reaction, you must start with the same number of atoms (or moles) of each element as you end with. We need to balance the equation by adjusting the coefficients to make the element count equal We CANNOT change the subscripts to balance; they are part of the chemical compound
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Balancing Chemical Reactions Keep a count of each element symbol for both the reactant and product side Start by assuming 1 of every reactant and 1 of every product Start with one element symbol that’s unbalanced; increase the coefficient on the side that has too few Update the count of ALL ELEMENT SYMBOLS in that compound Repeat until balanced H 2 + O 2 H 2 O 1 2 O 2 2 H Product Reactant Element 2 2 2 4 4
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Balancing Reactions Hints • DON’T ATTEMPT TO BALANCE UNTIL YOU HAVE ALL PRODUCT FORMULAS FIGURED OUT! • If a polyatomic ion is in a reactant, and remains together, you can balance it as a unit
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Types of Reactions (capitals= things to look for to help identify) • Double Displacement TWO IONIC COMPOUNDS switch anion partners AB + CD AD + CB • Single Displacement An IONIC COMPOUND reacts with an ELEMENT (element can be a diatomic) AB + E A + EB • Combination (a.k.a. synthesis) Two substances (element, molecule or ionic) combine to form ONE PRODUCT A + B AB or AB + C ABC or AB + CD ABCD • Decomposition The reverse of synthesis; ONE REACTANT is broken up into 2 or more products AB A + B • Combustion Hydrocarbon + Oxygen CO 2 + H 2 O C x H y + O 2 CO 2 + H 2 O
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Guidelines for predicting products First, determine what type of reaction it is by looking at the reactants
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This note was uploaded on 04/20/2010 for the course CHEMISTRY 02 taught by Professor Little during the Spring '10 term at S.E. Louisiana.

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103_7 - Dr. Littles Learning Goals for Lab 7 Understand how...

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