Introduction to Enthalpy of Reaction Practice Test

Heat is released by the surroundings, so $\Delta H$ is positive for the reaction.

Heat is released to the surroundings, so $\Delta H$ is negative for the reaction.

Heat is absorbed from the surroundings, so $\Delta H$ is positive for the reaction.

Heat is absorbed by the surroundings, so $\Delta H$ is negative for the reaction.

No heat is transferred, so $\Delta H$ is zero for the reaction.