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bch 369

bch 369


School: University of Texas at Austin
Department: Biochemistry
Course: Fundamentals of Biochemistry
Professor: Gail grabner
Term: Spring 2015
Cost: 25
Name: Lecture_3.pdf
Description: Lecture 3 NOTES
Uploaded: 01/28/2017
2 Pages 93 Views 0 Unlocks

What is happening in covalent bonding?

What element has the highest number of atoms?

What element has the highest mass percent?

Lecture 3 What element has the highest mass percent? What element has the  highest number of atoms? This is for cells. - O (because there is so  much water in cells-makes 60-70% of cells) H Water is a molecule with ____________________. The differences in O and  H electronegativities establishes a strong bond. - covalent bonding What We also discuss several other topics like joshua stevenson unr
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is happening in covalent bonding? - atoms share outer shell  electrons to completely fill each atoms outer shells What happens in ionic bonding? - electrons are transferred from one  atom to the other to complete filled outer shells and create oppositely  charged ions Metals in biological systems will be _______ and associated with  _______________. - cations, anions (like Cl-) What is the angle of of the H-O-H bond in water? - 104.5 **Know how to draw dipole of water molecule** -  Permanent dipoles are designated by u and are expressed in  ________________. - Debye units (D) Why does water readily dissolve polar compounds? - The compounds  have partial charges which the water interacts with through  electrostatic interactions and H bonding. How does water dissolve salts? - Water interacts with electrostatic  interactions. The water/cation and water/anion interactions are  stronger than the interactions within the anhydrous salt.  **be able to draw hydration shells** Water has a ___________ structure. - tetrahedral The structure of H20 is conducive to ________________, when the  hydrogen atom interacts with an electronegative atom of another. H20  can associate w/ ____ other H20. - H bonding, 4 (be able to draw this  structure) What is the difference between how H20 bonds in liquid water and in  ice? - In liquid water, H-bonding is not complete due to irregularity of liquid water structure. In ice, a regular crystal structure is present and  H-bonding is complete. This makes density less than that of liquid  water.  water= 3.4 H-bonds/water molecule ice= 4 H-bonds/water molecule The hydrophobic effect that causes nonpolar molecules to condense is  an ______________-driven process connected to water release. - entropy **Look at diagrams in notes** An acid is _____________ while a base is a _______________. - proton  donor, proton acceptor Ka is the - acid dissociation constant Many biological molecules are _________________ . - weak acids Covalent bond strength is related to differences in _______________. -  atom electronegativities, distance between outer shell electrons and  nucleus and nucleus charge What forms around ions when water is dissolving salts? - hydration  shells of water molecules surround the ion Water can form H bonds with how many other water molecules? - 4 H bonds are _________ with a defined length of ___________ A between  the oxygens. - linear; 2.8-3 Why is the hydrophobic effect favored entropically? - when a np  molecule associates with another np molecule, this release the  constrained water molecule that was previously ordered at the surface  of the molecule. The pKa corresponds to the pH at which _____________. - half the acid is  protonated

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