Lecture 2 Flashcards Preview

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Flashcards in Lecture 2 Deck (14):
1

Ionic Bond

- giving e-
- Ionic bond is stronger for MgCl2 than NaCl because of charge (affects solubility, NaCl is easier to dissolve)

2

Which group give up e- easily?

Group 1 and group 7 wants e-

3

Hydrophilic

- water loving
- polar molecules and ions dissolve readily in water

4

what is water important

- extremely good solvent

5

Hydrophobic

- water hating
- nonpolar molecules do not dissolve in water

6

Hydrophobic interaction

- water forces nonpolar molecules tgt coz it minimizes their disruptive effects on the hydrogen bonded water network
- important for protein folding and membrane

7

van der Waals interaction

Nonpolar molecules are also attracted to each other via relatively weak attractions called van der Waals forces (transient dipoles).

8

Bond Energy

- amount of E needed to separate two bonded or interacting atoms under physiological conditions

9

Ionic bond (in biology)

normally very strong but in biology very weak

10

conservation of matter

Energy can neither be created nor destroyed

11

Difference btwn moles and molar

- A mole is the amount of a substance in grams whose weight is equal to its molecular weight
- molar (1M) solution is one mole of a compound dissolved in water to make one liter

12

Acids

- release/donate H+ ions in solution
if the reaction (dissociation) is complete, it is a strong acid
- COOH is weak because it dissociates partially and reversibly

13

Bases

- accepts H+ in solution (release OH-)
- NaOH ionizes completely to Na+ and OH-. The OH- absorbs H+ to form water. It is a strong base.
- amino group (NH2)
weak base

14

pH

the negative logarithm of the H+ concentration in moles/liter