Ammonium chloride ammonium nitrate

1. calcium chloride
2. magnesium sulfate
3. potassium bromide
4. potassium nitrate
5. potassium hydroxide
6. sodium acetate
which material is best for keeping something cool

D.na is the answer hope this

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.