Any Chemistry Puzzles?

I am looking for some chemistry puzzles (not crossword or sudoku, something more challenging..like logic?) suitable for high school students, any help?

Mark S, JPAA2008-01-24T16:49:59Z

Favorite Answer

There are a couple of non-crossword puzzles here:

?2016-05-28T08:40:14Z

Seems like I am doing the same Crossword Puzzle.. 2) A compound of oxygen and one or more other elements (5 letters) -- Oxide 4) Avogadro's number of any particle of definite composition (4 letters) -- Mole 6) Describes two-atom molecules (8 letters) -- Diatomic I need.. 1) A crystal consisting of a solid substance combined chemically with water in a definite ratio (7 letters) 2) Describes a one-atom molecule (9 letters) 3) A measure of the internal energy of a system, partly (8 letters) 4) A solution in which the solvent is alcohol (8 letters) 5) A substance that changes the speed of reaction without being permanently altered (8 letters) 6) An explanation of observed relationships that have been verified to some extent (6 letters) 7) The atom minus its valence electrons (6 letters)