Test Tube Lab:
Questions: Is it possible to lower the freezing point of ice? What is the difference between a physical and a chemical change? What is an insulator?
Hypothesis:
Variables:
Materials: Jar of salt, two empty jars, ice, two Tablespoons, two glass test tubes, two thermometers, two paper towels, water, tape dispenser
Procedures:
1.) Split your lab table into two groups. Distribute a glass jar, glass test tube, and a thermometer to each group. One group will also need two paper towels and a tape dispenser.
2.) One group will fold the paper towels in half (long way) and tape the paper towel around the glass jar. Send one person to fill your glass test-tube 1/3 of the way with water.
3.) Send one person to fill your group’s glass jar with ice (about ¾ fill). Using your hands, move the ice in the jar so you can make a hole in the center and GENTLY place the glass test tube and thermometer in the center of jar – the ice should hold these in place.
4.) Read the thermometer and record your starting temperature in Celsius on paper.
5.) Measure our one (1) Tablespoon of salt and pour over the ice (pour this over NOT into the test tube). Record your temperature on your paper in Celsius.
6.) Continue step 5 until the water in your test tube freezes solid.
Data Chart:
Analysis:
Conclusion: