lecture 3 part 1

Question 1

what does e- clouds show

Answer 1

where e- are likely to be

Question 2

what do electrons determine

Answer 2

atoms ability to form bonds and thus form molecule

Question 3

what do physical and chemical properties depend on

Answer 3

its atom and ho they are bonded together

Question 4

electrons are responsible for ____ in molecule

Answer 4

PE

Question 5

why do atoms make bonds with other atoms

Answer 5

to fill outer e- shell and make it much more stable

Question 6

how are covalent bonds created

Answer 6

by sharing e- by atoms

Question 7

are covalent bonds weak

Answer 7

no they are very strong. They are not broken by:
-inc in temp (up to 100C)
-changes in PH
-changes in salt concentration
-presence of detergents or non polar solvents

Question 8

what do chemical reactions involve

Answer 8

breaking and forming of covalent bonds

Question 9

in bio systems what is required for chem rxn to take place

Answer 9

enzymes

Question 10

electronegativity

Answer 10

measure of atoms attraction for e- in a covalent bond

Question 11

non polar covalent bond

Answer 11

e- shared equally

Question 12

polar covalent bond

Answer 12

e- not shared equally

Question 13

are fat moleqs polar or non polar

Answer 13

non polar-its tails are made of C + H atoms