N2 + 3H2-->2NH3 what is the excess reagent in the haber reaction if equal moles of hydrogen and nitrogen are used ?​

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

A0.100-kilogram apple hangs in a tree 1.50 meter above the ground. ignore frictional effects, the total mechanical energy of the apples is

Which method would be best to separate a mixture of sand and gravel