phosphine contains 91.1% of p and 8.9% of h, water contains 88.8% of o and 11.2% of h, phosphorus tetroxide contains 56.4% of p and 43.6% of o. show that these data illustrate the law of reciprocal proportion.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

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

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.