Which compounds are organic?
a. CO2
b. NaCl
c. C6 H12 O6
d. CH2P (C6H5)3

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.