Why is it hard for scientists to change lead into gold? scientists would have to change the number of protons in lead atoms. scientists would have to change the number of electrons in lead atoms. scientists would have to change the number of neutrons in lead atoms. scientists would have to change the number of protons and neutrons in lead atoms.

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

What is the mass of 0.46 mol of mgcl2

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.