During lab, you learned about exothermic and endothermic heats of solution. Which compounds below could be used for a cold pack? (Select all that apply.)

a. LiCl (ΔHsolution = −37.0 kJ/mol)
b. KClO4 (ΔHsolution = +51.0 kJ/mol)
c. NaBrO3 (ΔHsolution = +26.9 kJ/mol)
d. NH4NO3 (ΔHsolution = +25.7 kJ/mol)
e. CaCl2 (ΔHsolution = −81.3 kJ/mol)
f. NaOH (ΔHsolution = −44.5 kJ/mol)

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

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

In which phase(s) do the molecules take the shape of the container?