Nitric oxide can be oxidized in air to form nitrogen dioxide. at normal atmospheric concentrations this is a very slow process.
2 no(g) + o2(g) → 2 no2(g) + 232.4 kj
nitrogen dioxide is more commonly formed as a byproduct of vehicle exhaust and it contributes to acid deposition.
the equation indicates that the reaction
a. is exothermic
b. is endothermic
c. is absorbing energy
d. products have more energy than do the reactants

exothermic

Explanation:

This is an exothermic reaction because you can see the 232.4 kJ at the end of the reaction. That means that 232.4 kilo-joules are released when the reaction happens; when energy is released during a reaction, the reaction is exothermic.

Tell me if you need anything else! :)

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

quartz

explanation: