I'm stuck, can someone me. maddie wanted to make a sugar-water solution to put in her hummingbird feeder. she found some sugar cubes and was about to drop them into a glass of water, when her brother suggested crushing the cubes before mixing. was this a good suggestion? why or why not? a) no. crushed or cubed did not matter. the nature of the solute is more important. eliminate b) yes. crushing the cube results in greater kinetic energy of the solute and therefore increases the rate of solution. c) yes. crushing the sugar cube provides greater surface area or contact on a molecular level between solute and solvent. d) no. regardless of the particle size, as long as the solute-solvent mixture is stirred the rate of solution will be the same.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: