Lab 2: Properties of Matter - Density
Pre-lab Questions
1. What can cause the density of the same substance to change?
2. List two possible hazards in this laboratory experiment.
3. A gold-colored ring is found to weigh 2.542 g at 20 °C. The ring is dropped into a graduated cylinder filled with water, and is found to displace 0.33 mL of liquid. The density of 14 carat gold ranges from 12.9 - 14.6 g/mL at 20 °C. Is the ring made of gold? Explain your answer.
Experiment: Determination of Density
Post-lab Questions
1. Take photographs of your experimental set up for Part 1 and Part 2, and your results. Submit them with your laboratory report.
2. What material did you determine your washers are made from? Why did you decide your sample washers are made out of this metal?
3. Why is the calcium chloride solution poured into the density column first?
4. Which type of plastic is most dense? Which type is the least dense? Explain.
5. How could you use a density gradient column to help identify whether a toy car is made with more metal or more plastic?
Lab 3: Mixtures and Solutions
Pre-lab Questions
1. Name two homogeneous mixtures and two heterogeneous mixtures that you come across daily.
2. Explain how you would separate a solid mixture of sand and salt using any of the methods mentioned above.
Experiment: Separation of a Mixture
Post-lab Questions
1. Take photographs of your experimental set up and results. Submit them with your laboratory report.
2. What important characteristics of aspirin did you use to separate it from the other pill components?
3. What is the purpose of rinsing the final aspirin crystals with a small amount of ice-cold distilled water (Step 16)?
4. Evaluate your percentage recovery. Provide an explanation if your recovery was more than 100% or very low. How could you improve your results?
Attachment:- Lab_Assignment.rar