What is the total energy change for the following reaction: 2H2 + O2 -> 2H2O?

Given:
H-H bond: 436 kJ/mol
O-O double bond: 499 kJ/mol
H-O bond: 463 kJ/mol

A. -481 kJ/mol
B. + 445 kJ/mol
C. +63 kJ/mol
D. -730.5 kJ/mol

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

The minerals found in bones are deposited by living cells called

What material does not melt at any temperature