Question

Cold packs contain an ionic compound such as ammonium nitrate and a separate pouch of water that is broken when the cold pack is needed. Which of the following indicates the type of change and the process that produces the change, respectively?


endothermic reaction, ionization


endothermic reaction, dissociation


exothermic reaction, dissociation


exothermic reaction, ionization

Answer 1

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✔✔ C) Exothermic reaction, dissociation

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Answer 2

An exothermic reaction, ionization indicates the type of change and the process that produces the change

• A method that releases heat into the environment is termed the associate degree exoergic method. most typical chemical reactions and all combustions, like those that power transport and heating—are exoergic.
• Less acquainted square measure chemical reactions that absorb heat from the environment.
• A method that absorbs heat is termed associate degree endoergic method variety of common physical processes square measure endoergic. as an example, vaporization is endoergic, as a result of heat should be provided to drive molecules of a liquid except each other.
• The dissolution of nitrate in water is endoergic indeed, this method is employed in instant cold packs for sports injuries.
• Many of the cold packs sold-out in stores use this endoergic method. a chilly pack typically contains a flimsy bag of solid nitrate within a bigger package crammed with water.
• Once punched, the inner bag ruptures. This releases the nitrate, which dissolves and produces a calming pack to alleviate pain and swelling in aching joints
• Manufacturers cash in on endoergic dissolution to supply cold packs that athletes will use to treat injuries. One sort of cold pack contains water and salt, like nitrate, in separate compartments. after you crush the pack, the membrane that divides the compartments breaks, and also the salt dissolves.
• This dissolution method is endoergic. It absorbs heat for a brief amount of your time, therefore the cold pack feels cold.
• The athletic trainer will cause this reaction to occur in a very cold pack by breaking a membrane within the pack and permitting nitrate to combine with water.
• Endothermic reactions square measure a lot less common. The endoergic dissolution of nitrate in water is the basis of the moment cold packs that square measure enclosed in some first-aid kits. They include a plastic envelope containing water-colored blue (for psychological reasons) and a tiny low tube of nitrate, that is broken once the pack is to be used. 
• Instant cold packs won't ice athletic injuries on the sphere containing nitrate and water separated by a skinny plastic divider. once the divider is broken, the nitrate dissolves consistent with the reaction

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