47. Which exception to the octet rule is shown by this molecule? 

a. uneven number of valence electrons

b. suboctet

c. expanded octet

d. coordinate covalent bond

i have a chem exam tomorrow and i really don't understand how toremember the 20 standard amino acids as well as how if given a fewto put together, how to do that.
like for example, if i am given ala-met-arg how do i do that?

also, i am having trouble showing how an amino acid changes as thepH changes.
please please help!!

Hello My chemistry experts. I have been having basic chemistry 101 issues due to english being my 3rd language. and I have an exam tomorrow afternoon at 4:20pm PST in Los Angeles. which I am terified of. If anyone want to help me pass the class. please help me figure out the solutions. I will compensate for an hour of your time. Please message me back with your emails or whichever is easier. I will photocopy the exam questions for you. thank you.