You need to calculate the enthalpy change (AH) of the reaction A + B → C.
How can the enthalpies given for the reaction steps below be combined to
give the overall change in enthalpy?
A+
BD
C+ B+D
Дн.
O A. AH = AH 2 - AHA
B. AH = AH-AHO 2
C. AHO = AH , + 2A HP 2
O D. AHO AHO, +AH2

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Part of molten rock at mid-ocean ridges

In salt water solution,the salt is the blank