Bio 141 Notes (1/23/14) Flashcards Preview

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Flashcards in Bio 141 Notes (1/23/14) Deck (23):
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Atoms

Can't be divided any further
Composed of nucleus (center) - neutrons and protons (positive)
Electrons (outside) negative

1

Gives each atom identity

Protons
Atomic number

2

How many electrons fill the shells

1st - 2
2nd - 8
3rd - 8

3

Atoms with filled shells are...

stable, inert, non-reactive

4

inert gases (ex.)

Neon, Helium, Argon
their shells are full

5

Ions

Formed when atoms borrow electrons

6

Ionic Bonds

taken not shared

7

Cation

positively charged ion

8

Anion

negatively charged ion

9

acids give...

H+

10

Bases give..

OH-

11

Stable Ions

dissolve easily in water

12

Covalent Bonds

share electrons

13

Hydrogen Bonds

weak electrical forces cause an attraction (like magnets)
weak molecules are polar

14

Hydrophilic

love water
polar

15

Hydrophobic

Hate water
non polar

16

Cohesion

water sticking to itself
surface tension

17

Adhesion

Water sticking to other molecules
capillary action

18

Functional Groups

small but significant
affect physical properties, polarity, charge, reactivity

19

Monomers

consist of one molecule unit

20

Condensation Reaction

forming bonds releases water

21

Hydrolisis

breaking bonds requires water imput

22

Polymers

simple molecules and macromolecules