Procedure

How can a student know how much drying agent to use?

If the drying agent swirls, the student has added enough. If all of the drying agent stays clumped together, the student needs to add a little more drying agent to the sample.

What does carcinogen mean?

A substance or agent capable of causing or producing cancer in mammals.

Small fire contained completely with a beaker.

Cover the flame with a watch glass or a hard back book

What safety rules apply to the organic chemistry laboratory?

Do not conduct any experimental procedures unless the TA is present; never remove equipment or chemicals from the lab; wear enclosed safety goggles at all times; keep all backpacks and coats off the floor and out of the aisles

What should a student do if there is a fire in the laboratory?

Do not panic, evaluate the situation, and then alert your Teaching Assistant for help.

For an ice bath, only use ice alone to assist in an even cooling and temperature transfer.

FALSE

For maximum agitation potential, use stir bars and boiling chips together.

FALSE

Heating mantles should be plugged directly into an alternating current outlet.

FALSE

If a student is asked for an arbitrary volume of 10 mL, then they must measure to precisely 10 mL.

FALSE

Never grease the joints on common glassware setups.

FALSE

One should never use boiling chips to moderate reflux and prevent bumping.

FALSE

Regardless of the setup of the reflux apparatus, if liquid is circulated through a condenser, the cold water (inlet) should be directed at the top first.

FALSE

When keeping a laboratory notebook, a student should always:

NO- write in a quad ruled computation & lab notebook with dimensions of 9-1/4\" x 11-3/4\". YES- place a straightline under the last entry at the end of each lab session to designate an end to the day\'s work. YES- start every experiment on a new page with a date and title at the top. NO- never include any changes to the experimental procedure that may have been necessary and the reasons for the change.

Fire confined to a small portion of clothing.

Pat the fire out

In the laboratory, what should a student be able to locate at all times?

Safety shower, eyewash stations, fire extinguishers, laboratory exits

The entire room is on fire

Sound the fire alarm and leave the building.

For the condenser, the bottom tube should be connected to the water source, the upper tube placed into the drain.

TRUE

If a student is asked to weigh out 3.0 g of a material, anything between 2.8 g and around 3.1 g will work fine.

TRUE

If a student needs to heat things over 100 °C, then one should use a heating mantle.

TRUE

Magnetic stirrers provide sufficient agitation to prevent bumping.

TRUE

Never drop a magnetic stir bar into a flask. Instead, tip the flask sideways and slide the stir bar in.

TRUE

One should allow the apparatus to completely cool before disassembling.

TRUE

The term reflux means heating a liquid to boiling and condensing the vapors back into the flask.

TRUE

When assembling your apparatus, always start from the bottom up when using clamps.

TRUE

Which of the following are true statements into the box that apply when using weigh boats in the laboratory?

TRUE- In some cases, the same weigh boat (labeled with the compound to be weighed) will be used by all students. FALSE- New weigh boats should always be used, even if it is for the same compound. TRUE- The empty weigh boat must be tared (set to zero) before adding material. FALSE- Never tare (set to zero) the empty weigh boat before adding material. TRUE- A paper towel should not be sued to transfer product out of a weigh boat TRUE-The balances in the laboratory can be zeroed out with a weigh boat on the balance. TRUE- Plastic weigh boats can help prevent spillage when weighing liquids into a beaker. FALSE- Liquids and solvents can be measured directly into plastic weigh boats.

Which of the following statements are true regarding safety rules and dressing defensively?

TRUE- No sandals or other open toed shoes are allowed. FALSE- Sandals and open toed shoes are permitted as long as you wear socks underneath. TRUE- You will be required to wear long pants in the laboratory at all times. FALSE- Shorts and skirts, as long as they are below the knee, are acceptable for the laboratory. TRUE- Long unrestrained hair is not permitted. TRUE- Wear enclosed safety goggles at all times in the laboratory. FALSE- Safety glasses are allowed in place of goggles if you do not wear contacts. TRUE- Loose fitting or baggy clothing is not allowed in the laboratory.

A large portion of your clothes is on fire.

Use the safety shower or the fire blanket.

At the end of an experiment, a student has an unused portion of reagent. Where should he or she place it?

YES- See if anyone else doing the experiment needs some of the reagent YES- Dispose of it in the place or container as written in the Clean-up section of the laboratory manual NO- Pour the reagent into any waste container in the hood NO- Pour the chemical in the trash can

Which of the following are appropriate attire for the chemistry laboratory?

YES- nitrile chemical resistant gloves; enclosed safety goggles NO- open toed footwear, shorts

If a student spills a chemical on their skin or clothing, what should they do?

YES- removed affected clothing YES- use the safety shower for spills that cover more than the students arms NO- do nothing, the TA made sure all the chemicals are safe NO- not worry, none of the chemicals are harmful for adults

What situations should students report to their TA IMMEDIATELY?

YES: fire, chemical spills NO: losing/forgetting their lab report