Question

change in temperature in a solution during a chemical reaction over time

question 14

a type of reaction that produces a change like the one shown in the graph is

• corrosion
• exothermic
• combustion
• endothermic

Explanation:

Analyze the temperature graph

The graph shows the temperature of a solution during a chemical reaction over time. The initial temperature starts at approximately \(14^\circ\text{C}\). As time progresses, the temperature drops rapidly and levels off below \(0^\circ\text{C}\) (around \(-3^\circ\text{C}\)).

Relate temperature change to reaction type

A decrease in temperature of the surroundings (the solution) indicates that the chemical reaction is absorbing thermal energy from its environment. This is a characteristic Chemical Properties observation.

Identify the correct term

• Corrosion is a chemical degradation process (like rusting) which is typically slow and slightly exothermic.
• Exothermic reactions release heat, which would cause the temperature of the solution to rise.
• Combustion is a rapid exothermic reaction with oxygen that releases significant heat and light.
• Endothermic reactions absorb heat from the surroundings, causing the temperature of the solution to decrease.

Since the temperature of the solution decreases, the reaction is endothermic.

Answer:

• corrosion
• exothermic
• combustion
• endothermic (Correct answer)