What sign does the change in enthalpy have when the reaction releases heat energy to the surrounding?

How is the introduction of the cane toad to queensland, australia an example of the unintended consequences of using non-native species to control pests? (site 1)

Asap 70 points do you think the little albert experiment was ethical or unethical? why? do you think that inflicting pain or suffering in the name of science is acceptable if something is learned from the experiment? why or why not?

Which are the apprehensions of the consumers who shop online? consumers who shop online enjoy the convenience of shopping from home but are apprehensive about theft and loss of privacy.