This preview has intentionally blurred parts. Sign up to view the full document

View Full Document

Unformatted Document Excerpt

Name: Student Shane Reynolds Student ID: 4139537 Date: 16 Sept 11 Course and Section Number: SCI 131 Lesson 1 Lab: Laboratory Safety & Differences in Density due to Temperature PART 1 Begin by viewing the following Thinkwell video 27.1.1 CIA Demonstration: Laboratory Safety After you watch the above video, check out the safety contract at http://www.flinnsci.com/Documents/miscPDFs/Safety_Contract.pdf and then answer the questions below in sufficient detail: (a) (1 pts) Describe some general lab safety rules that were discussed in this video and reading. Answer: Some general safety rules when in lab are to cover up. You should wear goggles, gloves, long pants, and no open toed shoes. You should even invest in a lab coat for added protection. You should know your surroundings, such as where the open shower is as well as the fire extinguisher. (b) (1 pts) Briefly discuss the importance of safety in the chemistry lab, and why it is important to know the location of safety equipment in the lab. Answer: It is very important to know the location of safety equipment in the lab. If during the lab a fire were to break out, if you already know where the extinguisher is then you have a better chance of getting to it quickly and putting the fire out. It is also very important to be safe and not horseplay because that is how accidents can happen that could lead to an accident that may require the use of the fire extinguisher or the shower. (c) (10 pts) Indicate whether the following statements are true or false in the blank provided. If the video did not indicate a direct answer to some of these, be sure to read the link above, and then you may be required to do a little searching on the internet to find the correct answer (cite your sources!): _F__1. It is not necessary to wear safety glasses or goggles while working in the laboratory if you wear eye glasses already. __T_2. Locate the fire extinguisher before working in the laboratory __T_3. Locate the first aid equipment before working in the laboratory __F_4. It is generally OK to taste chemicals in the laboratory as long as you are careful. __F_5. Never drink or smoke while in the laboratory __T_6. Consider all chemicals to be hazardous unless instructed otherwise _F__7. Open-toed shoes are generally OK to wear while in the laboratory as long as you are careful. _T__8. If any chemical contacts your skin or eyes, flush immediately with water, and then notify your laboratory instructor. _F__9. After completing an experiment, all chemical wastes should be dumped in the sink. __T_10. Never directly smell a gas or vapor; instead, waft a gas toward your nose using a cupped hand. __T_11. Never point the open end of a test tube toward yourself or your neighbor when heating a chemical. __T_12. Clean up all broken glassware immediately. _T__13. Lubricate the hole in a rubber stopper with glycerol or water before inserting glass tubing or a thermometer into the stopper. _T__14. Pour acids into water-not water into acid- because the heat of solution will cause the acid to splatter. _T__15. Do not use alcohol or other liquids organic near an open flame. __T_16. Do not perform unauthorized experiments. __T_17. Obey the special safety precautions mentioned in each experiment. __T_18. Notify the instructor immediately in case of an accident. _F__19. If you are wanting to pick up a piece of hot glassware (like a beaker or flask), you should first pour cold water on it. _F__20. You should return all unused chemicals to their original containers. (d) (3 pts) In the event of a chemical spill in the laboratory that involves broken glass, briefly explain the correct order of steps that should be taken by the student to address this situation. Answer: The very first step for a student to take after any laboratory accident is going to be to notify the instructor. The instructor will be able to determine the severity of the spill and will either tell the student that it is safe for them to clean it up themselves, or if the laboratory needs to be evacuated. As far as the broken glass, you should never handle broken glass with bare hands. Glass should be brushed into a dustpan and placed in a pre-designated container. PART 2 Please watch the following Thinkwell video: 1.2.3 CIA Demonstration: Differences in Density Due to Temperature After you watch the above video, answer the questions below in sufficient detail: (a) (2 pts) Explain what happened when the hot and cold water were mixed together in this experiment. WHY did this occur? What is the underlying concept or theory here? Answer: The first thing I noticed when the center piece separating the water was pulled was that it seemed that the cold blue water quickly rushed under the hot red water, while the hot red water seemed to rush to the top of the cold blue water. This occurred because the hot water is less dense than the cold water, therefore it will rise to the top. The overall concept here is that hot water has more energy than cold water and hot water moves faster than cold water and takes up more space. Density = mass/volume. (b) (3 pts) Suppose that instead of mixing water at different temperatures, you instead had two beakers of different liquids at the same temperature. In Beaker A, you have 50 mL of a blue liquid that has a mass of 65 grams. In Beaker B you have 75 mL of a yellow liquid that has a mass of 70 grams. Assuming no chemical reaction occurs and the liquids are capable of safely and thoroughly mixing together with one another, what would you expect to happen based on what you learned in this lab? What will the beaker look like when you pour them together? Explain your reasoning and show your work. Blue liquid density = 65 grams/50 mL Density = 1.3 g/mL Yellow liquid density = 70 grams/ 75mL Density = .93 g/mL After the liquids are combined the yellow less dense liquid will rise to the top, while the blue more dense liquid will sink to the bottom. Answer: References http://www.squ.edu.om/Sci/chem/support/Safety Guidelines.pdf http://www.labmanager.com/?articles.view/articleNo/1128/article/The-Correct-Way-toInsert-Glass-Tubing-or-a-Thermometer-into-a-Stopper DON'T FORGET TO INCLUDE REFERENCES!!! ... View Full Document

End of Preview

Sign up now to access the rest of the document