How could you decide whether a ring was 24-karat gold or 14-karat gold without damaging the ring?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

What is the percent by mass of oxygen in fe2o3

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.