Which sentence is an example of how a scientist might use a model? A. A stopwatch is used to time the rate of a chemical reaction. B. A microscope is used to magnify a group of cells on a slide. C. A wrench is used to tighten a nut onto a piece of wood. D. The end of a slinky is moved vertically up and down to simulate a wave

D. The end of a slinky is moved vertically up and down to simulate a wave

Explanation:

Because it is simulation, it should be a model. The other choices are not simulation or model.

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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.

gas

explanation:

smoke is the matter of a gas