Exothermic and Endothermic Reactions

Exothermic and Endothermic Reactions

• Exothermic Reaction:

  • Transfers thermal energy to the surroundings.

  • Leads to an increase in the temperature of the surroundings.

  • ΔH is negative.

• Endothermic Reaction:

  • Takes in thermal energy from the surroundings.

  • Leads to a decrease in the temperature of the surroundings.

  • ΔH is positive.

• Enthalpy change (ΔH) is the transfer of thermal energy during a reaction.

• Energy changes can be observed as a rise or drop in temperature.

• Exothermic reactions give out heat.

• Endothermic reactions absorb heat.