Use bond energies to calculate the enthalpy of the complete combustion of propane. C-C 347 kJ/mol. C-H 413 kJ/mole, O=O 498 kJ/mol, C=O 805 kJ/mol, O-H 464 kJ/mol

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0