8. Thermochemistry
Endothermic & Exothermic Reactions
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Here we need to determine which of the following is an exothermic reaction. For d, we're gonna have steam condensing. So just make sure you see steam condensing there. Now it says, if we look at the options, we have c o two burning. Now burning usually connotes that we're breaking something down. You know, you you burn a piece of wood it breaks it down. You're breaking bonds. So that would be indicative of an endothermic reaction, not an exothermic reaction. Remember, exothermic is bond forming, not bond breaking. Next, reaction in a cold pack. Well, a cold pack feels cold to the touch, but we said earlier that exothermic reactions which release heat feel warm to the touch. So a a hot pack or heating pack would be an exothermic reaction. Dry ice subliming, so remember if you're subliming you're going from a let's see. You're going from a solid to a gas. But remember, we're talking about forming bonds, we wanna go do deposition, where we're going from a gas to a solid. The only one that makes sense in terms of an exothermic process is steam condensing. We're going from a gas to a liquid, so we're forming bonds. So remember, exothermic reactions are bond forming heat releasing reactions, meaning d is the only option that makes the most sense.
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