Lewis-Matheson Method

An empirical formula must have a whole number ratio of atoms in each element. The ratio is multiplied by two.

An automatic pipet was used to measure 0.450 mL water and 0.165 mL acetic anhydride and was added to the conical vial. A spin vane was placed into the vial and an air condenser was attached.

In this lab, a mixture of three solids was separated to their individual components through decantation,

The lab uses the measurements of a wooden dowel in length and diameter to collect data in order to interpret data in report form. The data is used to produce statistical data and how to correctly present it. A ruler and micrometer were used to measure the dimensions. Spreadsheets are then constructed in order to generate standard deviation, mean, median, mode, frequency, as well as variation of length, diameter, volume, and cross sectional area of the

15. Which parameter of glass is measured with bromoform and bromobenzene mixtures in a column?

1. Are any of the lab values in Table 1 out of normal range? Do you see some that are too high or too

Use VSEPR theory to predict the shape of a molecule based on its Lewis structure.

Prepare standard solution #1, Take 1 ml sub stock solution from the 100 ml beaker and then put into 25 ml volumetric flask with the help of 10ml graduate pipette.

Purpose: The purpose of this lab is to use the three equations of solution chemistry to determine the molarity and percent composition by weight of a solution.

This lab was not repeated to examine for consistent results, which may result in data where precision and accuracy are compromised. In this investigation,

First, we added water to the graduated cylinder to 20 mL. Then, placed the unknown substance in the water, the water increased and measured 25 mL. The volume was determined by subtracting 20 mL from 25 mL. The volume equaled 5 mL for the unknown substance. Next, we filled the water to 20 mL in the graduated cylinder. Then, placed aluminum in the water, the water increased and measured 25 mL. The volume was determined by subtracting 20 mL from 25 mL. The volume equaled 5 mL for aluminum. After that, we added water to the graduated cylinder to 20 mL. Then, placed the zinc in the water, the water increased and measured 22.5 mL. The volume was determined by subtracting 20 mL from 22.5 mL. The volume equaled 2.5 mL for zinc. Last, we added water to the graduated cylinder to 20 mL. Then, placed lead in the water, the water increased and measured 24 mL. The volume was determined by subtracting 20 mL from 24 mL. The volume equaled 4 mL for

In part II, the ΔH°f of Mg was determined by a similar procedure used in part I, where Hess’s Law was first used to add the

Incorporation of assay controls included setting up a spectrophotomer and running the chart recorder with a full-scale deflection before the start of the assay. The set recorder had a corresponding value of 1 for the change in the absorbance. Therefore, prior testing was done to observe whether a change occurred in the readings. This helped to indicate that the results were valid, as they could have been affected by a fault during the setting up of the spectrophotometer. On the other hand this was considered as one of the controls for the experiment. Nevertheless, a new cuvette had to be used for each assay.

three substances formed in like manner by the violence of fire comes into one mixture,

The analyses of mixture were to distinguish and identify homogeneous mixture by using the techniques of decantation and sublimation. By performing these techniques, we examined our solutions such as SiO2 (sand), NH4Cl (ammonium chloride), and NaCl (sodium chloride) and mixed H2O (water) with each solution after being heated. After examining our solutions, we made calculations by finding the percent mass of each solution once the experiment was completed. In our findings, we were able to determine the mass of the determined and the percent recovery of matter. The outcome of the experiment was that we made the correct