Questions...

A few questions came in overnight.....

just like exam #4, are there going to be an "explanation" section about trends in the periodic table or is it going to be "circle which one is bigger/smaller, has higher first ionization energy..."?

Yes, there will be questions where you will be expected to explain your answer.

could you give a brief explanation of endothermic vs exothermic in reaction...i remember i got a couple of those wrong. it seems like it should be straight forward but it's not always!

Endothermic reactions require heat, exothermic reactions liberate heat. The "trick" question here usually involves water freezing. To make water freeze, you must remove heat from the system, so freezing water (or any substance) is an exothermic process, even though it "feels cold" if you were to hold it in your hand.

Other questions, let me know. See you in a few hours...