13. What is the percent mass of 6.3 g HCl in 78.5 mL H2O? Assume the density of H2O is 0.998 g/mL.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

What is the correct equation for cellular respiration?

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.