Which of the following is true regarding the atoms involved in a chemical reaction? A The same number of each type of atom will always be present before and after a chemical reaction takes place. B Some of the atoms present before the reaction will always be lost during a chemical reaction. Some of the atoms will always be changed into a different type of atom by a chemical reaction. D During a chemical reaction, atoms will always be combined into much larger molecules.​

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.