lecture 3 part 1 Flashcards
what does e- clouds show
where e- are likely to be
what do electrons determine
atoms ability to form bonds and thus form molecule
what do physical and chemical properties depend on
its atom and ho they are bonded together
electrons are responsible for ____ in molecule
PE
why do atoms make bonds with other atoms
to fill outer e- shell and make it much more stable
how are covalent bonds created
by sharing e- by atoms
are covalent bonds weak
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
what do chemical reactions involve
breaking and forming of covalent bonds
in bio systems what is required for chem rxn to take place
enzymes
electronegativity
measure of atoms attraction for e- in a covalent bond
non polar covalent bond
e- shared equally
polar covalent bond
e- not shared equally
are fat moleqs polar or non polar
non polar-its tails are made of C + H atoms