Thermodynamics and Chemical Reactions

Topics: Thermodynamics, Temperature, Energy Pages: 2 (367 words) Published: November 14, 2010
Energy, often in the state of heat, is involved in chemical reactions and phases changes. Changes in energy, can translate in temperature differentiations. In such a case, energy is transferred as heat. The quantity of heat exerted in a reaction referred to as (joules) can be identified through the following equation: Heat Exerted= (Mass of Sample) x (Specific Heat) x (Change in Temperature) q=msΔT

Within a calorimeter is where the reactions within this lab take place. A calorimeter allows the quantity of heat either manufactured or devoured to me measured. Exothermic reactions yield negative ΔH values, while reactions that consume and necessitate heat are endothermic and give way positive ΔH values.

Solutions that are water based is incorporated heavily in the chemical reactions within this lab; therefore, the specific heat of water, 4.184 J/g C, can be replaced for s in every calculation. Generally, the specific heat of a prearranged material is a measure of the magnitude of heat that is either achieved or vanished when a gram of the material alters temperature by one degree Celsius.

The change in temperature can be determined by finding the variation between the primary and concluding temperatures. The mass of the substance is additionally easily determined. Accordingly, the heat unconstrained can be calculated for as soon as every one of the variables on the right side of the equation has been discovered.

Hess’ Law, which says that the heat of configuration (enthalpy change, ΔH) of a reaction can be compute by taking away the ΔH of the products from the ΔH of the reactants, is illustrated through this lab experiment.

This lab contains two purposes. In the first part, the temperature change is calculated when NaOH and HCl are merged in a calorimeter. The equation for this reaction is as illustrated: NaOH (aq) ¬ + HCl¬ (aq)  NaCl (aq) + H2O (l) + Heat

Assorted amounts of each solution are tested, and the principle is to establish which set of...
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