E. Mark each description as an exothermic or endothermic reaction. (2 points) Description
Exothermic
Endothermic
A + heat → B
1
-ΔΗ
Energy diagram:
I
Energy of reactants
greater than energy of
products

Who is better, messi or cristiano, i need this for a chemistry class. asap

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion