Intermolecular Interactions (Unit 1) Flashcards
Intermolecular forces occur between
different molecules or parts of molecules
Intermolecular interactions depend on
Polarity of the molecule
Types of intermolecular attractions
Hydrogen Bonding, Hydrophobic/Hydrophilic
Hydrogen Bonding
Attraction between polar molecules or between polar areas of a molecule. Between H and N, O, or F.
What uses H-bonds to give shape to their molecules?
Proteins and DNA
What can H-bonds explain?
Paper clip floating and water climbing a tube
Cohesion
Water molecules attracting to each other
Adhesion
Water molecules “stick” to charge on container
Hydrophobic Interactions
Water fearing. When nonpolar molecules are placed in water, they will not interact with water molecules.
Hydrophilic Interactions
Water loving. When polar molecules are placed in water, they interact with hydrogen bonds
What does hydrophobic effect influence?
How proteins fold, and how cell membrane forms
Water is the…
Universal solvent
When ionic compounds are placed in water, they will..
dissociate into their component ions
How do polar molecules dissolve?
The positive end of H2O pulls at negative end of polar molecule, and vice versa. The molecules will not break apart as ionic compounds do, but they will separate from one another. (Dissolve but not dissociate)
