Week 13 - GeneralChemistry CHEM151 Week 13 UA GenChem

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 13
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UA GenChem Chemical Reactions in Water Many relevant chemical  reactions occur in water.
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UA GenChem Aqueous Solutions To explain, predict, and control chemical reactions in water we need  to understand what happens when  molecular  and  ionic   compounds dissolve in this liquid.  For example, when some substances  dissolve in water they generate solutions  that can conduct electricity.  Why is that? Let’s explore it!!
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UA GenChem Some  dissolved   materials  conduct  electricity  well, others  poorly. Strong Electrolyte Weak Electrolyte Electrolytes
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UA GenChem . Some dissolved  materials  conduct  electricity well,  others poorly,  and some  not at all . Strong Electrolyte Non Electrolyte Pure water is a  NON ELECTROLYTE Non-Electrolytes
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UA GenChem Which solution could this be? 1. NaCl 2. CaCl 2 3. Sucrose C 12 H 22 O 11
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UA GenChem Which solution could this be? NaCl in water or Ca(NO 3 ) 2  in water  or C 12 H 22 O 11  (a sugar) in water Is this a strong, weak, or non electrolyte? Let’s Think Many soluble molecular compounds are non  electrolytes.
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UA GenChem Which solution could this be? 1. NaCl 2. CaCl 2 3. Sucrose C 12 H 22 O 11
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UA GenChem Which solution could this be? NaCl in water or Ca(NO 3 ) 2  in water  or C 12 H 22 O 11  (a sugar) in water Is this a strong, weak,  or non electrolyte? Let’s Think
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UA GenChem Strong Electrolytes Soluble ionic compounds are  strong electrolytes (substances that completely dissociate into ions do  conduct electricity) ( aq ) = “aqueous” or dissolved in a large amount of water  In symbolic form we represent this  dissolution process as Ca(NO 3 ) 2             Ca 2+ (aq)   +   NO 3 - (aq) H 2 O
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UA GenChem Mixing Ionic Compounds When mixing solutions of ionic compounds, all of the ions in the system  interact with each other.  If the interactions between these ions are strong enough, they may group  together, form a lattice and “ precipitate ” (segregate from solution). The interactions between ions may lead  to the formation of a new product:   Precipitation Reaction
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UA GenChem What is a Chemical Reaction? When particles collide and create new  substances we have a  CHEMICAL REACTION We use CHEMICAL EQUATIONS    to describe the process.
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UA GenChem Macroscopic Microscopic or Particulate Symbolic M + (aq) + X ˉ (aq)   MX(s) Three different  perspectives Ways to Look at Chemical Reactions Ways to Look at Chemical Reactions
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UA GenChem Precipitation?
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This note was uploaded on 02/05/2011 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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Week 13 - GeneralChemistry CHEM151 Week 13 UA GenChem

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