Chemistry_1031_day14_022309_actual

Chemistry_1031_day14_022309_actual - • materials that...

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General Chemistry I CHE-1031 Dr. Jonathan M. Smith Monday, February 23
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Today • Solutions
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Following water forming…
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Solutions Chapter 4
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5 What Happens When a Solute Dissolves? attractive forces between the solute particles holding them together attractive forces between the solvent molecules Mixing: consider attractive forces between the solute particles and the solvent molecules if the attractions between solute and solvent are strong enough, the solute will dissolve
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6 Table Salt Dissolving in Water Each ion is attracted to the surrounding water molecules and pulled off and away from the crystal When it enters the solution, the ion is surrounded by water molecules, insulating it from other ions The result is a solution with free moving charged particles able to conduct electricity
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7 Electrolytes and Nonelectrolytes
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Unformatted text preview: • materials that dissolve in water to form a solution that will conduct electricity are called electrolytes • materials that dissolve in water to form a solution that will not conduct electricity are called nonelectrolytes 8 Molecular View of Electrolytes and Nonelectrolytes • in order to conduct electricity, a material must have charged particles that are able to flow • electrolyte solutions all contain ions dissolved in the water – ionic compounds are electrolytes because they all dissociate into their ions when they dissolve • nonelectrolyte solutions contain whole molecules dissolved in the water – generally, molecular compounds do not ionize when they dissolve in water • the notable exception being molecular acids...
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