Ethanol & Ions?

Question

1. Explain the following observation:

When a small amount of ethanol at room temperature is placed on the skin, a cold sensation is felt.

2. Oxygen forms the ion O2- and sodium forms the ion Na+.

-in what way are these two ions different?
-in what way are these two ions the same?


Thanks a lot.

Answer 1

well i dunno the 1st one but the diff between the two ions is:
O gains 2 electrons but Na looses 1electron

similarity is:
both atoms gain or loose electron to acquire noble gas configration.