Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. if the reaction has a 78.0% yield, what mass of hydrogen forms 545 kg of water?

Noble gases are the most reactive elements on the periodic table. a. true b. false

What does x represent in the formula for the compound xcl4?

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.