the heat 'em up hand warmer
For this project, we were given the task to make a hand warmer that can be sold at the students store during the winter for sports and other activities. We were given six different salts to test and see which one produced the most heat. My group and I found that lithium chloride (LiCl) had the highest temperature change per gram (8 degrees celsius). To create the handwarmer, we added 4 grams of LiCl to a water balloon and put it in a zip-lock bag with 30 mL of water. We then sealed the bag. When you pop the balloon, a reaction occurs and heat we be released.
Vocabulary:
Calorimetry- measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due
Endothermic- requiring the absorption of heat
Exothermic- the release of heat
Enthalpy- a thermodynamic quantity equivalent to the total heat content of a system
Heat- the quality of being hot; high temperature
Thermochemistry- the branch of chemistry concerned with the quantities of heat evolved or absorbed during chemical reactions
Vocabulary:
Calorimetry- measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due
Endothermic- requiring the absorption of heat
Exothermic- the release of heat
Enthalpy- a thermodynamic quantity equivalent to the total heat content of a system
Heat- the quality of being hot; high temperature
Thermochemistry- the branch of chemistry concerned with the quantities of heat evolved or absorbed during chemical reactions
handwarmers__2_.pdf | |
File Size: | 666 kb |
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Reflection: We worked on this project for a couple weeks and did many tests. My group and I worked very well together and our hand warmer worked too, although not for long. To improve the product, I think my group could have tested greater amounts of calcium chloride, that way the hand warmer could have stayed warmer longer, but we also have to keep in mind how much it costs. We also struggled to put the calcium chloride into the water balloon and at times, had trouble popping the balloon. In addition, we need to think about how much we are going to sell them for. We were going to sell two for ten, but I don't think very many people would buy them.