Complete the statement.
During this chemical reaction, the solution becomes ().
A: colder
B: warmer
To determine whether the solution becomes warmer or colder, look for the text that describes the movement of thermal energy during the reaction.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, a small amount of thermal energy is taken in from the surroundings.The underlined text tells you that thermal energy is taken in from the surroundings. Because thermal energy moves out of the surroundings and into the reaction, the temperature of the surroundings decreases.The surroundings include the solution that the reaction takes place in. So, the solution becomes colder.