I've noticed a recent trend of people answering questions in the comments. I've asked about this issue in the past, and though I understand that sometimes people don't want to write out a complete answer, the entire premise of Stack Exchange is "ask questions, get answers," NOT "ask questions, get comments." Stack Exchange is made for people to vote on the best answers, and downvote answers you feel do a bad job of explaining the question. You can only upvote comments, and if they spark disagreement, the only thing these answer-comments invite are more comments. This seems much more like a forum to me, and is exactly what Stack Exchange is not.
Please help maintain Chemistry.SE as a place to get both thorough and knowledgable answers. It doesn't take that much more time to just write out a full answer.