4.(03.02 LC) Which of the following is a characteristic of science? (3 points)
It cannot be repeated.
It asks questions that cannot be tested.
It is done by only one scientist at a time.
It uses data and observations to make conclusions.

Explanation:

It is done by only one scientist at a time.

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.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.