o-chem lab quiz

If you injure yourself, who would you notify immediately

your instructor

What are the four fundamental principles that would be considered before beginning work that are essential to the culture of safety in the laboratory.

1. minimize exposure 2.proper preparation to minimize the opportunity for accidents 3.plan ahead 4. do not underestimate hazards or risks

The figure below shows a boiling-point composition diagram (also known as a liquid-vapor composition diagram) for components A and B. What is the boiling point for pure compound A?

50

The figure below shows a boiling-point composition diagram (also known as a liquid-vapor composition diagram) for components A and B. Estimate at what temperature a 50:50 mixture of A and B will boil. Only enter the number; don't include the "˚C".

65

T/F: Dalton's law states that the vapor pressure above a solution of two miscible liquids will equal the sum of the individual vapor pressures adjusted for the mole fraction of each component.

False

T/F: When working in a fume hood, you can have the sash as high as you need and still have the fume hood working to protect you.

False

When is it okay to have food or drink in the lab?

Never

What is the purpose of boiling stones/chips?

To prevent bumping

T/F Fractional distillation is essential preforming multiple simple distillations.

True

What situations would simple distillation be perfectly reasonable over fractional distillation?

When distilling a liquid that contains non-volatile impurities and when purifying a compound that is already >90% pure

When should you stop your distillation for Experiment 1?

When you've collected 25 ml of distillate and/or just before the distillation pot goes dry.

There are 4 fundamental principles that should be considered before beginning work that are essential to the culture of safety in the laboratory. Which of the choices below is not one of the 4 fundamental principles

Work closely with your instructor

Distillation (fractional or simple) is a technique used to separate compounds based on their respective

boiling points

if you dispense or weigh out too much of a solvent or reagent you should

discard the excess into the proper waste location

how should the disposal of chemical waste be handled?

follow the direction in your lab manual and look for appropriate waste container in the lab.

In comparing the differences in the set-up for a simple and fractional distillation, fractional distillation uses a

fractionating column

when opening doors to labs and surrounding areas __

gloves should never be worn

What should be done before leaving lab for the day ?

lower your fume hood sash below the yellow arrow, lock up your lab drawer, turn off and unplug heat sources like the stirrer and hot plate, and dispose of any trash remaining in your fume hood.

which of the following is not structural feature or physical property you will be evaluating in experiment 2?

molecular symmetry

if the instructor or sub fo your lab has not arrived and the lab is unlocked, you should ______

not enter the lab

broken glass should be disposed into ___

the white cardboard glass waste boxes

If you are required to exit the lab due to a fire or the building alarm sounds, you should immediately go ____

to baker lawn

What is the purpose of boiling stones/chips?

to prevent bumping

which is not a hazard for tert-butanol

toxic

T/F: You must eye wear appropriate eye protection whenever anyone is working with hazard chemicals or processes in the lab

true

T/F: You should immediately report any injuries ( such as a cut, burn, chemical spill on you surface) that occurred in lab to your instructor

true

When heating the test tube containing salicylic acid, you should ___.

use a boiling stick, agitate the test tube, use a test clamp, use a hot water bath as the heat source

In experiment 2, you will be comparing the solubility of various organic compounds in

water

If no one is immediately behind you in line to measure out the salicylic acid, you should _____.

wipe off the spatula, clean up any spilled material on the balance and/or counter, cap the bottle