Adding a catalyst to a system at equilibrium lowers the activation energy required by a system, which shifts the equilibrium position toward the products

A catalyst speeds up a reaction by lowering the activation energy.

Explanation:

A catalyst has no effect on the equilibrium of a reaction.A catalyst does not add energy to a reaction neither does a catalyst consumed in a chemical reaction .

Therefore, A catalyst speeds up a reaction by lowering the activation energy.

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.

passing a magnet thought the

mixture , because iron gets attracted to magnet .