Pick out all of the numbers that are compressions in the sound wave above, moving from left to right on the wave. Pick out of all of the numbers that are rarefactions in the sound wave above, moving from
right to left on the wave. This 9-digit number is the combination for the lock to the next page of this
escape activity.

4al + 3o2 → 2al2o3 what does the "3" in front of o2 stand for? a) it indicates that there are 5 oxygen atoms after you add the coefficient and the subscript. b) it indicates that that there are are total of 6 oxygen atoms all bonded together as a single molecule. c) it indicates that there are 3 oxygen molecules chemically bonded to each other in the reaction. d) it indicates that there are 3 separate oxygen molecules in the reaction.