Questions: Two different liquids are mixed together. Which observation indicates that an exothermic chemical reaction has taken place? an increase in volume a decrease in volume a rise in temperature a drop in temperature

Solution Steps

The question asks which observation indicates that an exothermic chemical reaction has taken place when two different liquids are mixed together.

An exothermic reaction is a chemical reaction that releases energy in the form of heat. This means that the temperature of the surroundings will increase.

• An increase in volume: This does not necessarily indicate an exothermic reaction.
• A decrease in volume: This also does not necessarily indicate an exothermic reaction.
• A rise in temperature: This indicates that heat is being released, which is a characteristic of an exothermic reaction.
• A drop in temperature: This would indicate an endothermic reaction, where heat is absorbed.

Final Answer