What often happens to rocks that undergo chemical weathering ? ? a. they form crystals b. they produce acids c. they become stronger d. they crumble more easily

Heat by radiation will most likely be transferred through a.gas b.liquid c.solid d.insulator

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.

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.