Please enable JavaScript.
Coggle requires JavaScript to display documents.
Energy Change (Additional Notes/Vocabulary (Exothermic Reactions (In…
Energy Change
-
Exothermic
-
-
-
More energy is given out than is taken in (e.g burning, respiration)
Once started, exothermic reactions tend to keep going as each reaction releases more energy to fuel neighboring molecules.
-
-
-
HotHands
Exothermic
Iron, activated carbon, and water [Disposable]
A supersaturated solution of sodium acetate. The sodium acetate will crystallize. When the flexible metallic activator is bent it releases one or more particles of metal. Which creates a nucleation site for the crystals to form. This reaction releases a large amount of heat. [Reusable just boil the package before use about dozens of times.]
Instant Cold Pack
Endothermic
A bag of water inside a bag of ammonium nitrate, calcium ammonium nitrate or urea. Once squeezed the water bag is broken and the reaction makes the outer bag cold.
Glowsticks
-
Glass vial inside containing a hydrogen peroxide solution an activator. Floating in a solution of Phenyl Oxalate Ester and Fluorescent Dye Solution. When you snap a glow-stick that vial breaks. The Hydrogen peroxide combines with the other stuff to create 2 compounds, Phenol and Peroxy Acid Ester which decomposes into extra Phenol due to being unstable.
It also produces a cylic peroxy compound which decomposes to carbon dioxide which releases energy to that dye. The electrons in the dye's atoms jump to a higher level then fallback down creating light without heat the other chemicals in the dye create the color
-
-
-
