Question

In preparation for a blizzard, a city dispatches a crew to spread salt on the street surface of the bridges around town. The salt is spread on the streets because it will likely change the freezing point of water from ____ to ____. A. 0 °C to 5 °C B. 0 °C to -5 °C C. 0 °C to 32 °C D. 32 °C to 27 °C

Answer 1

B. 0 °C to -5 °C

Step-by-step explanation:

City crews spread salt on streets, because it lowers the freezing point of water and keeps them ice-free until the temperature drops too low.

If the air temperature is 0 °C, but the salt lowers the freezing point of water to -5 °C, the sidewalks, streets, and bridges will remain ice-free.

A and C are wrong, because they show salt increasing the freezing point of ice.

D is wrong. It would be correct if the temperatures were in Fahrenheit. Salt can lower the freezing point of water from 32 °F to 27 °F.