The image represents the reaction between a certain number of molecules of N2 and H2. If the maximum possible amount of NH3 is formed during the reaction, what is the leftover reactant? (4 points) a One molecule of N2 b One molecule of H2 c Two molecules of N2 d Two molecules of H2

hloride, what is the mass of calcium in

explanation:

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.