CHEMISTRY 101 FALL 2010 Major Unit Taught By: Debbie Clary and Paula Pursley
Gobstopper Lab Students practiced their qualitative observation skills as they documented color changes in a Gobstoppers experiment. First hypothesizing, students guessed the number of layers in a Gobstopper. Different layers exhibited different colors as they dissolved in a dish of water. All were encouraged to compare their results with their original hypotheses. “Did your data support your hypothesis?”
LAB EQUIPMENT INVENTORIES Students paired up to identify and inventory each piece of lab equipment found at the lab stations. Each pair was responsible for 3 drawers at their station.
Solvents Demonstration Is there such a thing as a universal solvent? If such a solvent existed, could you find a problem with a substance that could dissolve everything? Think about it! Students loved the reaction caused by dropping calcium sulfate into a beaker of acetic acid.
SOLVENTS LAB Working with Styrofoam packing peanuts and two mystery solvents, students attempted to break down the Styrofoam into its natural state. (One solvent did nothing…the other amazed students!) Students worked with acetone and water to see if different types of packing peanuts react in different ways with these two solvents. How will our future be impacted by biodegradable products that could be degraded through the solvent, water?
CHEMICAL REACTIONS Chemistry students caused a chemical reaction (and combustion) working with magnesium and hydrochloric acid. Hydrogen gas was trapped in test tubes and a resultant “pop” was heard when a spark was added to the top of the test tube.
Demonstrations Mrs. Pursley demonstrates the “safe” way to strike a match and light a candle, without getting burned. (Students worked with fire for the first time in today’s labs.) Mrs. Clary burns a magnesium strip to demonstrate physical characteristics of this metal.
Disintegration Rate of Painkillers in Stomach Acid Chemistry students tested four different painkillers to determine the disintegration rate in water and hydrochloric acid (stomach acid).
Does one painkiller dissolve quicker than others in the stomach?
SALICYLIC ACID CRYSTALS Mrs. Clary demonstrates the pH level of salicylic acid after students viewed a PowerPoint on Native American Healing Secrets.