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Lesson 1 Lab: Laboratory Safety & Differences in Density due to Temperature

PART 1

Begin by viewing the following Thinkwell video

15.1.1 CIA Demonstration: Laboratory Safety Please click on this link to watch the video

you may want to copy and paste to watch the video also-

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:

(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:

(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!):

___1. You should always wear safety glasses or goggles while working in the

laboratory, even if you wear eye glasses already.

___2. Locate the fire extinguisher before working in the laboratory

___3. Locate the first aid equipment before working in the laboratory

___4. It is generally OK to taste chemicals in the laboratory as long as you are careful.

___5. It is generally OK to eat or drink while in the laboratory except in very specific

situations.

___6. Consider all chemicals to be hazardous unless instructed otherwise

___7. Open-toed shoes are generally OK to wear while in the laboratory as long as you

are careful.

___8. If any chemical contacts your skin or eyes, flush immediately with water, and then

notify your laboratory instructor.

___9. After completing an experiment, all chemical wastes should be dumped in the

sink.

___10. Never directly smell a gas or vapor; instead, waft a gas toward your nose using

a cupped hand.

___11. Never point the open end of a test tube toward yourself or your neighbor when

heating a chemical.

___12. When there is a situation involving broken glass, it is not necessary to notify

your instructor as long as you clean up the mess yourself.

___13. You should lubricate the hole in a rubber stopper with glycerol or water before

inserting glass tubing or a thermometer into the stopper.

___14. Pour acids into water-not water into acid- because the heat of solution will cause

the acid to splatter.

___15. Do not use alcohol or other organic liquids near an open flame.

___16. It’s usually OK to perform unauthorized experiments in the laboratory as long as

you are careful.

___17. Obey the special safety precautions mentioned in each experiment.

___18. Notify the instructor immediately in case of an accident.

___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 to cool it down.

___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. Be clear and detailed.

Answer:

PART 2

Please watch the following Thinkwell video:

1.2.1  CIA Demonstration: Differences in Density Due to Temperature  please click on

this link to watch the video also copy and paste to watch the video please-

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? Be

specific.

Answer:

(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 70

mL of a blue liquid that has a mass of 45 grams. In Beaker B you have 65 mL of a

yellow liquid that has a mass of 80 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.

Answer:

DON’T FORGET TO INCLUDE REFERENCES!!!

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