Banana

The duration and temperature change of the reception are graphed to identify the hanged in enthalpy and entropy that took place as the melted substance solidifies. Using the data we can then predict the change in free zipper, GAG . Keywords randomness, Enthalpy, Free energy, naphthalene II. Introduction Enthalpy, H, is a thermodynamic prop of a agreement. It is defined as the sum of internal energy U of a system and the harvest-home of the pressure and volume of the system H = IS+UP The UP term represents the mechanical work make on or by the system.Since we are usually more(prenominal) interested in changes than in arbitrary values, we could write H = + up Entropy, S, is an another thermodynamic property. Which we can consider as a verse of the disorder or randomness of a system. An ordered system has low entropy. A disordered system has high entropy AS equals the heat transferred between the system and Its surroundings divided by T AS = Q/T = H/T Enthalpy and entropy ar e different quantities. Entropy has the units of heat, Joules. Entropy has the units of heat divided by temperature, Joules per Kelvin.In this experiment, the group would Like to compare the entropy, AS and enthalpy, AH by monitoring the temperature & time during phase change of a melted naphthalene to reeking point. And using the data to predict LEG. Ill. Experimental particle Prepare 250 ml of half full tap water In a beaker to be lay In a ring stand, light the Bunsen burner to start heating of water. In a abundant test pipage fill half full of thread at the end of the test tube to let it hang in an iron clamp. Place the test tube into the beaker of hot water .Notice the melt down of solid crystals. Carefully remove the water bath apparatus and burner from beneath the test tube and begin recording the temperature every after 30 sec, until the naphthalene passes the reeking point of molecules. IV. Results and Discussion Initial Room temp 34 c Temperature vs.. Time Based from the results the naphthalene freezes at 840 seconds in 77. 8 degrees Celsius. Freezing reaction is an exothermic solve energy is lost from the water and dissipated to the surroundings.Therefore, as the surroundings get hotter, they are gaining more energy and thus the entropy of the surroundings is increasing. During the process of melting naphthalene, the reaction is said to be endothermic because the system absorbs the energy from its surroundings. The relationship between the mime and temperature is inversely proportional as the time change magnitude the temperature decreases. The Gibbs Free Energy of reaction (G) is an indicator of reaction spontaneity.Obeying the Entropy change and enthalpy change unneurotic influence the spontaneity of a chemical reaction. A spontaneous process is capable of proceeding in a given direction without needing to be driven by an outside source of energy. In minute of arc law of thermodynamics, the naturally occurring reactions always move towa rd a state of lower potential energy. Thus, a reaction with a negative delta applied during the reaction. A reaction that is spontaneous is always accompanied by the net profit release of free energy (energy available to do useful work).However, some spontaneous reactions require added energy to get started. The energy they finally release includes both this added energy and the calculated free energy of the reaction. V. death The cooling the reaction is said to be spontaneous because there is no heat applied during the process and enthalpy seemed to be the dominating factor in fingernails. The spontaneity of the process appears to be associated with a super ordered yester going to a less-ordered, uniform state.