Plz help look at the photo!

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one