Tutor profile: Kylee R.
Subject: Organic Chemistry
What are enantiomers?
Enantiomers are stereoisomers - i.e. their formula and bonds are the same, but their structure differs in 3D. Enantiomers are stereoisomers that exist as mirror images of each other. Occurs when there is a chiral carbon in the structure.
If pK1 = 2.34 and pK2 = 9.60, then the pI is?
pI = isoelectric point. It's where the molecule is electrically neutral. It is found by finding the mean of the pK values. So (2.34 + 9.60) / 2 = 5.97
Subject: Basic Chemistry
What are the 3 types of bonds and how do they work?
Metallic, covalent and ionic. Metallic - occurs only in metals. The electrons are free to move, which is why metals conduct electricity. Covalent - between non-metals only. Electrons are shared to form the bond. Ionic - between metals and non-metals. Metals donate their electrons (thus becoming positive, a cation) and non-metals accept them (become negative, an anion). A bond is formed due to the attraction between + and -.