Category : Chemisty

Neutralization Reactions Lab Report

This report was to to study Neutralization Reactions Sample Calculations 1. q = ms∆t – 1M HCl q = (acid mass(g))(base mass(g))(tf-ti)(s) q = -(50.2+26.1)(8.6)(4.184) q = -2.746 kJ   2. x mol of acid & base – 1M HCl mol HCl = (1M HCl x (50mL))/(1000mL) = 0.05 mol HCl mol NaOH = (2M NaOH x (25mL)/(1000mL) = 0.05 mol NaOH   3. mol H20 – 1M HCl mol H2O – .05mol NaOH + .05mol HCl à .05mol NaCl + […]

Electrochemistry and the Nerst Equation

Objectives: 1. Measure the electrical potential of a zinc/iron battery cell at differing concentrations. 2. Construct an electrolytic cell. Procedure: Voltaic Cell 1. Prepare a 100mL of 0.1M Iron (II) Sulfate solution in a 150mL beaker and place the iron strip in the solution. 2. Prepare a 100mL of 0.1M Zinc Sulfate solution in a 150mL beaker and place the zinc strip in the solution. 3. Connect the beakers using the plastic bridge, which must be filled with a KCl […]

Heat Transfer Lab Experiment

Heat is the transfer of energy between matter due to differences in temperature. In this experiment, heat transfer was studied by calorimetry. The mixing of warm and cool water was observed, as well as the experimental latent heat of fusion. Data: Mixing Warm and Cold Water Table Mass of Empty Graduated Cylinder 86.9 grams Trial 1 Trial 2 Mass of Graduated Cylinder and Cold Water 136.00 g 136.15 g Mass of Cold Water 49.10 g 49.25 Temperature C, Probe 1 […]

Crystallization; Decolorization; Identification of an Unknown using Mel-Temp

The purpose of this experiment was to develop new laboratory techniques and apply them by purifying and identifying an unknown. Table 1: Reagents in the Experiment Compound Ethanol Acetone Toluene Other Designation Grain Alcohol Dimethylformaldehyde Methylbenzene Compound Class Non-Polar Polar Covalent Polar Covalent Lewis Structure Boiling Point 78 degrees Celcius 56 degrees Celcius 110.6 degrees Celcius Melting Point -114.1 degrees Celcius -95 degrees Celcius -95 degrees Celcius Specific Gravity 0.79 g/cm3 0.79  g/cm3 0.86 g/cm3 Water Solubility Miscible Complete Insoluble […]

Newton’s Law of Cooling Lab Experiment

This experiment was designed to model the process in which thermal energy moves from one body to another. Newton observed that the energy transfer between two bodies is proportional to the difference in temperature between the bodies. The cooling of hot water to room temperature will be observed for the model. Data table: Average room temperature (°C) 30.29 Initial Water Temp (°C) 70.3   Analysis: Newton’s cooling law was given above as: T = T0 e–kt + Troom Match the variables […]

Melting Point and Boiling Point

The purpose of this experiment was to observe the purity of a compound by testing its melting or boiling point. When a chemical is at a melting point, the vapor pressure of its solid phase is equal to that of the liquid phase. Impurities like H20 will lower the melting point of a compound. Reagents Tested: Cinnamic Acid Urea Pentane Analysis: Boiling Point of Pentane Pentane boils at about a third of the temperature of boiling water (see Table A […]