Jack and his lab partner did an experiment on the results of heating different combinations of chemicals on a hot plate. He performed four trials, each combining two different chemicals. Jack recorded several observations from the experiment. Which of his observations was a qualitative result?
A.
The chemicals combined in trial one turned blue when heated.
B.
The chemicals combined in trial three had a volume of 200 mL before heating.
C.
The product of the fourth trial was a liquid with a volume of 150 mL.
D.
The product of the second trial was a solid with a mass of 50g.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

answer; i do believe the correct answer is (river); /// good luck

i think it's c. i'm not sure but i think so.