Why is Energy transferred from the substance of the surroundings when a substance freezes

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa