Which of these is Not a sign that a chemical change has occurred? A. a loss of transparency
B. a temperature change
C. an unexpected color change
D. The formation of a precipitate

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.

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose you."

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)