Will vinegar melt an ice cube faster or vegetable oil?
Assuming that the vinegar and oil are at the same temperature to begin with. And that the two cases of ice are of the same volume and temperature in each case. The vinegar will melt the ice fater as there is a net gain (negetive increase) of energy when the two are mixed. (mixing in this case is still valid even though the ice is solid. There is contact at the surface level) As oil and water are mutually insoluable there is no reaction and no heat released.