You are making homemade ice cream and can use either 200 g Ice Melt (CaCl2) or 200 g rock salt (NaCl) to lower the freezing point of 7.00 kg of ice (assume the ice is pure water). Which salt would help you eat your ice cream faster (i.e. lower the freezing temperature of the ice)?       NaCl     CaCl2   What is the lowered freezing point of the ice? *use "degC" for °C     *ΔTf = KfCmi *Kf(water) = -1.86 °C/m

3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The solution's temperature increases by 19.21°C. Calculate ∆H for the dissolution of the unknown solid. (The specific heat of the solution is 4.18 J/g･°C and the density of the solution is 1.20 g/mL)

2. Jazmin and Ty did a chemistry experiment in which they dissolved the ionic compound lithium chloride (LICI) in water. They observed that after mixing 3.0 g of the ionic compound into 20 mL of water, the temperature dropped from 22 °C to 15 °C. Based on these experimental results, it is likely that all of the following would result in a greater temperature decrease except: O a. Using 6.0 g of LiCl and 20 mL of water O b. Using 1.0 g of LiCl and 20 mL of water O c. Using 3.0 g of LiCl and 10 mL of water O d. Using 6.0 g of LiCl and 10 mL of water

To treat a burn on his hand, a person decides to place an ice cube on the burned skin. The mass of the ice cube is 10.5 g,10.5 g, and its initial temperature is −10.5 ∘C.−10.5 ∘C. The water resulting from the melted ice reaches the temperature of his skin, 29.2 ∘C.29.2 ∘C. How much heat is absorbed by the ice cube and resulting water? Assume that all of the water remains in the hand.