Lab Report Essay Example

Miguel Paulo D. Valdez
BS Chem-3

EXPERIMENT 14- Heat Effects and Calorimetry
Objective/ Introduction:

Heat is a form of energy, sometimes called thermal energy, which can pass spontaneously from an object at a high temperature to an object at a lower temperature. If the two objects are in contact, they will, given sufficient time, both reach the same temperature. Heat always travels from hot to cold objects and two objects will reach an equilibrium temperature. Heat flow is commonly measured in a device called a calorimeter, an insulating container that minimizes heat exchange between its contents and the surrounding. Heat flow in a device called a calorimeter. In this experiment, we should find the heat capacity of the calorimeter, the heat of neutralization and the specific heat of a metal.

Data:

A. Specific Heat Trial 1 Trial 2 Trial 3

Mass of stoppered test tube 5.2g 5.2g 5.2g

Mass of stoppered test tube and metal 8.7g 8.7g 8.7g

Mass of calorimeter 4.9g 4.9g 4.9g

Mass of calorimeter and water 44g 44g 44g

Mass of water 40g 40g 40g

Mass of metal 2.5g 2.5g 2.5g

Initial temperature of water 25 ˚C 25 ˚C 25 ˚C

Final temperature of water in calorimeter 26˚C 26 ˚C 27 ˚C

∆Twater

∆Tmetal

q water

Specific Heat of metal

Approximate molar mass of metal B. Heat of Solution Trial 1 Trial 2 Trial 3

Mass of calorimeter plus water 82.1g 82.1g 82.1g

Mass of beaker 108.5g 108.5g 108.5g

Mass of beaker plus solid 111g 111g 111g

Mass of water 28.5g 28.5g 28.5g

Mass of solid 2.5g 2.5g 2.5g

Initial temperature 24˚C 25˚C 25˚C

Final temperature 32˚C 30˚C 31˚C

Qwater:

∆Hrxn:

∆Hsolution per gram (J/g):

Molar ∆Hsolution (kJ/mol):

Is the solution reaction endothermic or exothermic? Explain your reasoning.:

C. Heat of Neutralization Trial 1 Trial 2 Trial 3

Original temperature of HCL sol’n 28˚C 27˚C