Answer: a) It is ionic and lowers the freezing point of water.
Freezing point depression is the process of the decrease in the freezing point of a solvent by addition of a non-volatile solute such as salt. The salt is added to the icy roads so as to lower down the freezing point of water and preventing the formation of the ice on the road this phenomena is called as freezing point depression. The ionic components of the salt split apart like Na⁺ and Cl⁻ and interacts with the water molecules which combines to form the solid state ice. Thereby, ions of salt interrupting in the formation of the solid structure that is ice.
Divide $147 by 7 you’ll get 21, so he’s making 21 dollars an hour, you’ll multiply 21 by 9 which you’ll get $189 so your answer will be $189 for 9 hours of work hope this helps!
