Activity+4

Activity #4: Experimenting with Chemical Changes, Part 2


 * __Materials__**: steel wool, 50 mL vinegar, 100 mL beaker, thermometer, rubber band


 * __Procedure__**: Place the steel wool in the bottom of the beaker. Use a rubber band to wrap the steel wool around the bulb of a thermometer. Wait two minutes and record the temperature of the steel wool. Add 50 mL vinegar to the beaker. Submerse the steel wool in the vinegar for a few seconds, remove it, and GENTLY squeeze out the excess vinegar into the sink. Wait for 5 minutes. Take the temperature again and record it below. Examine the steel wool for any changes that took place. __**Then record your observations below**. **What evidence is there that a chemical change has taken place?**__

INITIAL TEMPERATURE: 25 Celcius FINAL TEMPERATURE: 28 Celcius

__**Observations**__: Rust


 * __Analysis:__** **__What evidence indicates that a chemical change has taken place?__**

The evidence was that the wool rusted. Temperature change.