Purpose:
To design and create a hand warmer using chemistry to make an effective, safe, environmentally friendly, and inexpensive hand warmer, so it can be sold in the San Marin Student Store. For this project it was set up as a competition with all the tables as their own team. At our presentation we had four judges decide the results. They included: Mrs. Vogl, Mr. Philpot, Mr. Moore, and Mrs. Davis.
Process:
First we had to complete many labs to understand the reaction of the different salts we tested had on the water compared to one another. After finding the salt we were going to use for our project, our group began to think of ways we can maintain the heat we were going to produce. We used lithium chloride because it increased the most temperature wise. As you can see below below in our brainstorming or our data, we used Sodium Polyacrylate to absorb the heat.
Chemistry Behind the Hand Warmer
For our hand warmer we used lithium chloride and water. This reaction can be seen below:
2LiCl(s) + 2H2O(l) -> 2Li(aq) + 2Cl(aq)
This is an exothermic reaction because it releases heat and energy. In this reaction the lithium chloride is reacting with the water to create the exothermic reaction. The Sodium Polyacrylate absorbs the heat. During this reaction the ionic compounds dissolve in water. Since water is a polar molecule, the H2O molecules separate the ions into the liquid. The positive ends of the water molecules face the anions and the the negative ends face the cations.
Evidence
To design and create a hand warmer using chemistry to make an effective, safe, environmentally friendly, and inexpensive hand warmer, so it can be sold in the San Marin Student Store. For this project it was set up as a competition with all the tables as their own team. At our presentation we had four judges decide the results. They included: Mrs. Vogl, Mr. Philpot, Mr. Moore, and Mrs. Davis.
Process:
First we had to complete many labs to understand the reaction of the different salts we tested had on the water compared to one another. After finding the salt we were going to use for our project, our group began to think of ways we can maintain the heat we were going to produce. We used lithium chloride because it increased the most temperature wise. As you can see below below in our brainstorming or our data, we used Sodium Polyacrylate to absorb the heat.
Chemistry Behind the Hand Warmer
For our hand warmer we used lithium chloride and water. This reaction can be seen below:
2LiCl(s) + 2H2O(l) -> 2Li(aq) + 2Cl(aq)
This is an exothermic reaction because it releases heat and energy. In this reaction the lithium chloride is reacting with the water to create the exothermic reaction. The Sodium Polyacrylate absorbs the heat. During this reaction the ionic compounds dissolve in water. Since water is a polar molecule, the H2O molecules separate the ions into the liquid. The positive ends of the water molecules face the anions and the the negative ends face the cations.
Evidence