<p>Hi I'm doing a lab in Chemistry on Spontaneous Rxns and I was wondering what real life applications or connections to society I could use. </p>
<p>My lab write up is giving me trouble. --any suggestions?</p>
<pre><code>In class, we completed a lab to determine to the overall spontaneity of a reaction based on the entropy and enthalpy.
</code></pre>
<p>Also, too assign a sign for free energy based on the determined spontaneity. I made individual hypothesis for each
of the reactions. For the reaction between the vinegar and the washing soda I believed that it will be an exothermic
reaction and that it will fizz when the detergent is added to the vinegar. Next, I believed that in the reaction between
the water and ammonium chloride will be exothermic. Lastly, for the reaction between the silver nitrate and hydrochloric
acid the reaction will be endothermic.
In the first reaction, the intial tempature of the vinegar was twenty-six degrees celcius and when we added the
washing soda the reaction it caused a rapid amount of fizzing and then it slowly foamed back down. The final tempature was
twenty degrees celcius. The delta H for the reaction was zero. The reaction was already at equilibrium, this reaction favors
both the products and reactants equally.
In the second reaction, the intial tempature of the water was twenty-five degrees celcius when we added the
ammonium chloride to the water, the Ammonium Chloride dissolved into the water. The reaction between water and Ammonium
Chloride is exothermic and this is because heat is released during the reaction.The final tempature of the reaction was
twenty-four degrees celcius. The delta H for the reaction was negative one, which means that the reaction is spontaneous.
This reaction favors the products, this is because the reactions are spontaneous in the forward direction.
Next, in the third reaction we reacted Silver Nitrate and Hydrochloric Acid. The intial tempature of the Silver
Nitrate was twenty seven and a half degrees celcius and the intial tempature of the Hydrochloric acid was twenty-five
degrees celcius. When we reacted the two, the test tube became opaque and there were powdery crystals at the bottom. The
final tempature was twenty-nine degrees. This reaction was endothermic because heat is being absorbed. Endothermic
reactions are usually not spontaneous. An example of an endothermic reaction that is spontaneous is when ice melts at
room tempature.
Throughout the completetion of this lab, there could have been errors which would have led to bias data.
Here are some mistakes we could of made: Inaccurate measurements when measuring the substances with the graduated
cyclinder. Also, we could mis-read the tempature on the thermometer. Also, there could have been residue of the
substances from previous class periods. Lastly, we could have dilluted the substances.
Furthermore, delta G is the change in gibbs free energy, Delta H is the change in enthalpy and Delta S is the
change in entropy. Enthalpy is the heat content of a chemical, it is basically the difference in heat content of the
products and reactants. Entropy is a measure of the disorder or randomness in a closed system. They are related to each
other when finding Gibbs Free Energy, or delta G, which is the maximum amount of energy available from any chemical reaction.</p>