Lab Repor

Topics: Chemistry, Chemical reaction, Chemical substance Pages: 3 (932 words) Published: June 20, 2013
Purpose
Identify the mystery powder based on its physical and chemical properties.

Hypothesis
The physical properties of each powder can help identify what the mystery powder is, but the chemical properties will determine the answer.

Safety
* Wear safety glasses.
* Do not taste any substance in this experiment
* Iodine solution and some powders are hazardous.
* Wash hands when you have finished.
Materials
* Eye protection
* Well plate
* 6 small toothpicks for stirring each powder
* 6 white powders: icing sugar, cornstarch, Aspirin powder, baking soda, baking powder, and the mystery powder * Scoopula
* Test solutions in dropper bottles: water, universal indicator, vinegar, and iodine solution Apparatus

Observations

Procedure
1. The table for observations was copied into notebook.
2. Eye protection was obtained and worn, and a sample of each powder was placed on small pieces of paper and brought to the experiment area. 3. Each powder was added to its specified well in the well plate using a scoopula. Only the tip of the scoopula had powder on it so it was a small amount. 4. The physical properties of each powder were recorded into the table. 5. 5 drops of water were added to each well, and then mixed with a toothpick. Chemical reactions were recorded into notebooks. 6. Well plate was washed, rinsed, and dried completely to prepare for powders to be added again. Toothpicks stayed the same. 7. Repeat steps 3, 5, and 6, adding vinegar instead of water. 8. Repeat steps 3, 5, and 6, adding universal indicator instead of water. 9. Repeat steps 3, 5, and 6, adding iodine solution instead of water. 10. Well plate was washed with soap and water, toothpicks thrown out, remaining powders returned to their containers, experiment area wiped clean, and eyewear returned to shelves.

Analysis/Evaluation
A) Chemical changes that occurred:
* Bubbles/foam formed when mixing: water with...
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