Question

Read the passage about a chemical reaction that causes a change in temperature. Then, follow the instructions below.
Pickling is used to prevent foods such as meat and vegetables from spoiling too soon. Food that has been pickled may remain edible for more than a year! One type of pickling involves soaking the food in a solution of water and sodium chloride
(NaCl)
. When sodium chloride is dissolved in water, sodium ions
(Na+)
and chloride ions
(Cl−)
form in the solution. During this process, the solution becomes slightly colder.
Select the true statement.



This chemical reaction is exothermic. It converts chemical energy to thermal energy, which is released into the surroundings.

This chemical reaction is endothermic. It chemical energy to thermal energy, which is released into the surroundings.

Answer 1

The true statement is:

**This chemical reaction is endothermic. It converts chemical energy to thermal energy, which is absorbed from the surroundings.**

In an endothermic reaction, the system absorbs heat from the surroundings, which causes a decrease in temperature in the solution, as noted in the passage.