According to the following reaction, how much energy is evolved during the reaction of 72.5 g Cl2?  (Assume that B2H6 is present in excess)             B2H6 (g) + 6 Cl2 (g)  →  2 BCl3 (g) + 6 HCl (g)         ΔH°rxn = -1396 kJ

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

When the mercury level in a barometer decreases that atmospheric pressure has