Question

in school, jarrett learned that salt lowers the freezing point of water. he wants to test this in a home experiment. he combines 10 grams of salt and 500 milliliters of water in a container. in an identical container, he pours 500 milliliters of water and does not add salt to it. what should jarrett do next? a. place both containers in a freezer, and record the temperatures at which they begin to freeze. b. mix the two samples of water together in a 1.0-liter container, and bring them to a boil on a stove. c. place the salt water in a freezer and the pure water in a refrigerator. d. place the pure water in a freezer and the salt water in a refrigerator.

Explanation:

To test if salt lowers the freezing point of water, Jarrett needs to compare the freezing temperatures of salt water and pure water under the same conditions. Option A places both in a freezer (same environment) and records freezing temps, which is the correct experimental procedure. Option B mixes them, ruining the comparison. Options C and D use different environments (freezer vs refrigerator) for each, invalidating the comparison.

Answer:

A. Place both containers in a freezer, and record the temperatures at which they begin to freeze.