The nitrite ion is involved in the biochemical nitrogen cycle. youcan analyze for the nitrite ion content of a sample usingspectrophotometry by first using several organic compounds tocreate a colored compound from the ion. the followind data werecollected. a. construct a calibration plot, and determine the slope andintercept. b. what is the nitrite ion concentration in the unkownsolution?

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.