Question

categorize each statement as representing an exothermic or endothermic reaction.
heat is absorbed from surroundings
heat is released to surroundings
temperature decreases
temperature increases
the change in enthalpy is a negative number
the change in enthalpy is a positive number

Explanation:

1. In an endothermic reaction, heat is absorbed from the surroundings.
2. In an exothermic reaction, heat is released to the surroundings.
3. When a reaction is endothermic, it absorbs heat from the surroundings causing the temperature of the surroundings to decrease. When a reaction is exothermic, it releases heat to the surroundings causing the temperature of the surroundings to increase.
4. For an exothermic reaction, the change in enthalpy ($\Delta H$) is negative as heat is released. For an endothermic reaction, the change in enthalpy ($\Delta H$) is positive as heat is absorbed.

Answer:

Heat is absorbed from surroundings: Endothermic
Heat is released to surroundings: Exothermic
Temperature decreases: Endothermic
Temperature increases: Exothermic
The change in enthalpy is a negative number: Exothermic
The change in enthalpy is a positive number: Endothermic