Nitrogen and hydrogen combine to form ammonia in the haber process. calculate (in kj) the standard enthalpy change δh° for the reaction written below, using the bond energies given. n2(g) + 3h2(g) → 2nh3(g) bond: n≡n h–h n–h bond energy (kj/mol): 945 432 391

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane