Asubstance did not change its chemical nature in a reaction. which most likely describes the reaction

the answer is that "it was frozen"

I just took the test and got it right, hope it helps.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

can you attach a picture of the lettuce? : )