N2 + 3H2 » 2NH3 120 lbs 39 lbs 159 lbs
? lbs ? lbs 556 lbs
What are the new settings for nitrogen and hydrogen?

a
420 nitrogen, 136 hydrogen
b
410 nitrogen, 146 hydrogen
c
395 nitrogen, 161 hydrogen
d
465 nitrogen, 91 hydrogen

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.