1. Substances and properties

2. Today‘s topics A chemist‘s definition of the term „substance“
Substance properties
Using substance properties to identify unknown substances

3. The unlabeled samples „Substance“
Substance (Stoff) is the term used to identify all materials that make up our world
We can compare properties of the samples with substances we know
Examples for substance properties:

4. Planning the experiment
Pick one group card and form a group with everyone else who picked the same number
Pick up your group’s sample box
Figure out ways to test your samples for the properties listed on your group card. Don’t experiment yet!
Use the reverse of your worksheet to write them down
You may include any equipment that is on the desk in your planning
If you need hints, there are hint cards with the teacher
Once you are done, please check your plan with a teacher
Once the teacher has approved your plan you may pick up the next worksheet, safety glasses and your equipment and start

5. Let‘s get started! Don’t forget to:
Collect your results on worksheet 3
Clean up your workspace once you’re done
Match your samples to the substance profiles on the teacher’s desk
Prepare a presentation of your results
If your are done with everything, let us know!

6. Presenting your results
Form new groups that contain at least one of each glassware item
Explain how you examined your substance properties and present your results

7. Finishing up
Work with your neighbor to complete the back of worksheet 3