Chem 130 Ku

Composition & Separations

Group #3

TA: Amanda Furness

Chem 130 - Section 422

I. Introduction:

Part 1 Introduction:

Part one is used to determine if there is a measurable quality difference between premium brands of popcorn and cheaper brands. By understanding how the kernel pops, computing the mass of water within in the kernel is made possible. Within each kernel a certain percentage of total mass of each kernel is water, this water can be removed by popping the kernel. In order to determine the mass of the water before popping and after popping masses of the kernel will be taken.

Mass & Average Percentage: % mass= (mass of desired/total mass) x 100=%

Density= Mass/Volume

Part 2 Introduction:

Part two is used to determine the masses of the different parts of the mixture, popcorn, sand, salt and the iron fillings. A mixture is a combination of two or more different substances that are mixed, not chemically combined. During this portion of the experiment the lab group will separate the different components of the mixture, taking the masses of each component in order to determine the mass of each component. By picking out the kernels of popcorn the physical properties are exerted because kernels are a physical component, it is not chemically altered. The iron filings are magnetic, another physical property, by understanding that the filings were magnetic, a magnet was used in order to remove the filings from the mixture. Since the salt was mixed with the sand, water was added in order to remove the salt. A chemical property of salt is that it dissolves in water, hence why water was added. By filtering the sand out of the salt water mixture, the group was able to heat the sand to evaporate any water left behind, and then using a Bunsen burner, evaporate the water that was mixed with the salt to find the composition percentage of all parts of the mixture.

II. Experimental:

The lab procedure for part one was...