Chapter 13- Solutions Today is the last day to contact me about Exam #1 NEW OWL HOMEWORK HAS BEEN POSTED.

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Presentation transcript:

Chapter 13- Solutions Today is the last day to contact me about Exam #1 NEW OWL HOMEWORK HAS BEEN POSTED

Last time… Solubility of molecular (covalent) compounds Polymers Enthalpic vs. entropic considerations Enthalpy of mixing of hydrocarbons is slightly negative (favorable) Dissolution is NOT favored when water becomes ordered, but it IS favored when the solute forms strong bonds with water Flavor compounds Polymers Properties determined by chemical makeup of monomer(s), length of polymer, branching/cross-linking Shape determined by hydrophobicity and hydrophilicity of monomers Proteins: Fold into functional shape based on hydrogen bonding and burial of hydrophobic surface area

What holds DNA together?

DNA, Hydrogen Bonding, and Entropy

Lipids and Membranes Surfactants Self-assembly

Surfactants and Cleaning

Solubility of Ionic Compounds

Solubility Rules for Ionic Compounds

Ionic Compounds- Control of Solubility What happens to an ion when it dissolves? Why aren’t all ionic compounds soluble? Is dissolving an ionic compound exothermic or endothermic?

Ionic Compound Dissolution & Enthalpy CaCl2 NH4NO3 ∆Hdiss→ TREND?

Ionic Compound Dissolution & Entropy ∆Sdiss→ TREND?

Solubility Rules for Ionic Compounds

The dissolution of NH4NO3 is… (endo, T↓) H favored S favored H and S favored Can’t tell

The dissolution of CaCl2 is… (exo, T↑) H favored S favored H and S favored Can’t tell

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