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chm 410

ExperimentPhysical and Chemical PropertiesPhysical and Chemical Properties
Peter Jeschofnig, Ph.D.
Version 42-0188-00-01Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report
Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables
that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab
reports by providing this information in an editable file which can be sent to an instructor.
NameColorData Table 1: Solubility or Reaction
of HeatCold
NaClwww.LabPaq.com70©Hands-On Labs, Inc.Dilute
NaOH ExperimentPhysical and Chemical PropertiesQuestions
A. Did you observer any chemical changes in this experiment
B. What evidence did you use to decide that something was a chemical change
C. Give at least two examples of chemical changes you observed.D. Classify the following properties of sodium metal as physical or chemical:

• Silver metallic color:
Turns gray in air:
Melts at 98oC:
Reacts explosively with chlorine gas:E. Classify the following changes as physical or chemical:

• Water freezes at 0oC:
Baking soda when combined with vinegar produces bubbles:
Mothballs gradually disappear at room temperature:
Ice cubes in a freezer get smaller with time:
Baking soda loses mass as it is heated:
Tarnishing of silver:F. How would you show that dissolving table salt is a physical changeCleanup: Mix the leftover sodium hydroxide and hydrochloric acid in your beaker. This will
neutralize them. Now, pour them down the drain with lots of water. Place the small amount of
solid chemicals left (if any) in a small plastic bag and put it in the trash. After the burner fuel has
completely cooled,…

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