Materials 250 mL Beakers 100 mL Beaker 100 mL Graduated cylinder… Materials 250 mL Beakers 100 mL Beaker 100 mL Graduated cylinder Large funnel Large piece of cheesecloth pH Test strips Wooden stir sticks 200 mL Top soil 10 mL Vegetable oil 10 mL Acetic acid 10 mL Liquid laundry detergent Pair of gloves Safety glasses Underpad *Tap water *Scissors *Dish soap (for cleaning glassware) Experiment #1 Pre-Lab Questions1. Describe two ways that groundwater may be contaminated.2. Describe two possible observations of contaminated water that can be detected by the senses.3. Hypothesize whether there are some contaminants that can not be detected with the senses. How might these be tested for using the scientific method? EXPERIMENT #1 POST-LAB QUESTIONS 1. What effects did each of the contaminants have on the water in the experiment? Which contaminant seemed to have the most potent effect on the water? Explain why. 2. On a larger scale, what type of effects could these contaminants have on a town’s water source and the people who drank the water?3. Identify three types of human activity that could cause contaminants like oil, acid, and detergents to flow into the water supply? 4. What other items from a house could contaminate the water supply if they were dumped into the ground? Science Chemistry CHEM 109
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