Complete the statement.
During this chemical reaction, the solution becomes ().
colder warmer
When a chemical reaction absorbs or releases thermal energy, the reaction causes a change in temperature. Read the passage about a chemical reaction that absorbs or releases thermal energy. 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, a small amount of thermal energy is taken in from the surroundings.
During a chemical reaction, thermal energy is absorbed or released as heat. This transfer of thermal energy changes the temperature of the reaction's surroundings. The surroundings are everything around the reaction, such as the solution that the reaction takes place in or the air nearby.
Some reactions release thermal energy into the surroundings. This thermal energy is converted from chemical energy, which is provided by the molecules in the reaction. As the thermal energy moves out of the reaction and into the surroundings, the temperature of the surroundings increases.
Some reactions absorb thermal energy from the surroundings. This thermal energy is converted into chemical energy during the reaction. As the thermal energy moves out of the surroundings and into the reaction, the temperature of the surroundings decreases.
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.