On the periodic table, electronegativity increases as we move from the bottom to the top. What information does this give us?

This is a mixture that has the same composition throughout.

Which three statements represent the benefits of performing experiments using computer simulations?

Which of the following reactions is endothermic? h2(g) + ½ o2(g) h2o(g), h = -57.82 kcal ½n2(g) + o2(g) + 8.1 kcal no2(g) ½ n2(g) + 3/2 h2(g) nh3(g) + 11.0 kcal c(diamond) + o2(g) co2, h = -94.50 kcal