A gas absorbs 56 kJ of heat and does 31 kJ of work. Calculate Δ E.

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

In which reaction is precipitation occurring?

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m