Suppose you need to build a raft to cross a fast moving river. describe the physical and chemical properties of the raft that would be important.

For starters, your raft would have to be waterproof. It would have to be sturdy enough not to flip and big enough to hold you and anything else you might have with you. A chemical property might be that the tar you cover your raft with will prevent the water from getting in your raft. Hope I helped!