Foul+Water

Your task is to purify your foul water using the procedures provided. You must record your observations, measure the amounts of water and waste separated, and analyze the success of the overall process. In your analysis, you must __//incorporate//__, not define, the vocabulary words listed below to show that you know what they mean.

Your grade will be based on the samples you produce at the end of each stage of the purification process, the completeness and quality of your observations, measurements, calculations and analysis, the degree to which you accurately apply your vocabulary, your lab technique and safety, and your individual participation in the group. Your final water sample and analysis are due in class on Wednesday, September 21st.

Vocabulary: chemical property, physical property, homogeneous, heterogeneous, suspension, solution, density, filtrate, atom, element, molecule, compound, physical change, chemical change

Procedures: adapted from ChemComm 5th Ed. pp. 10-15

Observations: as recorded on your data chart, to be incorporated into your analysis

Calculations: % yield after each step of purification

Analysis 1. description of original sample of water and of the sample after each step of purification - focus on how your water sample changes from step to step 2. identification of impurity removed with each step of purification - based on your observations and on what you found each material is //supposed// to remove 3. discussion as to the efficiency of each step of purification (refer to both observations and calculations) - efficiency refers to both time and materials used as well as the amount of your sample that you are able to recover; decide whether or not you would consider each step efficient based on the amount of water you lost and how much your water was improved by that step