Lab6_Chemical_Reactions

Lab6_Chemical_Reactions - C 125 Ex eimntal Che istry 1 pr e...

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C125 Prelab C125 Exp er im en tal Che m i st ry 1 ** Some useful demonstrations can be found from the following website: http://www.iupui.edu/~chem125/demonstrations.htm
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Experimental Purpose Investigate what is meant by: Chemical vs. physical changes Solubility rules Driving forces Relative reactivity scheme Writing chemical equations Determine : Chemical reactions by observing physical changes Relative reactivity by observing a series of reactions
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Important Terms for This Experiment Chemical change Physical change Reaction types Combination Decomposition Single replacement Double replacement Spectator ion Solubility rules Driving forces Gas evolution Precipitation or solid formation neutralization Relative reactivity scheme Writing chemical equations
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Definition of Chemical Change A change in matter where different chemical substances are created by forming or breaking chemical bonds 1 A rearrangement of the atomic array of matter which results in a change of physical properties 2 Ex: reaction of a metal with an acid
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Definition of Physical Change A change in matter where different chemical substances change their physical appearance or state of matter Ex: Dissolution of a solid
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Reaction Types Combination A + B → A B Ex: 2 Fe (s) + O 2 (g) → 2 Fe O (aq) Decomposition A B A + B
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Reaction Types Single Replacement (displacement) A + B C A C + B Ex: Zn (s) + 2H Cl (aq) Zn Cl 2 (aq) + H 2 (g) Double Replacement (displacement) (or metathesis reaction) A B + C D A D + C B Ex: 2 K I (aq) + Pb (NO 3 ) 2 (aq) 2 K NO 3 (aq) + Pb I 2 (s)
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Definition of Spectator Ion Ions which are present in a solution but do not take part in a reaction 3 Spectator ions are not written in a net ionic chemical equation Ions which have the same state of matter and charge on both sides of a total ionic equation
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These rules are used when determining the state of matter of the products formed during a chemical reaction 4 All common compounds of Group I and ammonium ions are soluble. All nitrates, acetates, and chlorates are soluble.
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This note was uploaded on 11/02/2009 for the course CHEM C125 taught by Professor Staff during the Fall '08 term at IUPUI.

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Lab6_Chemical_Reactions - C 125 Ex eimntal Che istry 1 pr e...

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