Auburn University

Approved eye protection is to be worn a. for certain experiments b. for hazardous experiments only c. only when the teacher says so d. all the time - Answer d. all the time Eating or drinking in the laboratory is a) not permitted under any circumstances. b) allowed only during lunch. c) allowed only during the break. d) all right if you are careful. - Answer a) not permitted under any circumstances If you need to smell a chemical, you should place the tube close to you...

Acenone is: Volatile High irritant Flamable Organic compound with one carbonyl group All are correct - Answer All are correct What is the stationary phase in paper chromatography? The solvent mix The alumina The filter paper The pigments - Answer The filter paper In a chromatography column, the alumina is also called: Stationary phase Liquid phase Poker face Moving phase - Answer Stationary phase When you put the filter paper right next to...

Beaker - Answer A Beaker is simply a "glass container for laboratory use" they come in different sizes and almost always have a lip in the top rim. Graduated Cylinder - Answer A Graduated Cylinder is a cylinder that just got out of med school. Or maybe it's just a piece of glassware used to measure volume. Erlenmeyer Flask - Answer The Erlenmeyer Flask is your stereotypical piece of glassware that you see in cartoons and such. It has a flat base and narrow neck ...

If you left the freezer door open all night at work, all of the ice you had in the freezer would probably melt. This would be a result of _________. - Answer an endothermic reaction If you were the owner of the local spa, why would it be so important that you insist that for every chemical used there is an SDS available? - Answer Because it is a requirement of OSHA If your client requests that you use a solution that is neutral to his skin, which of the following pHs should you...

1. What maximum temperature must the water exceed in order for the reaction to be efficient? 100 degrees Celsius 90 degrees Farenheit 5600 degrees Celsius 100 degrees Farenheit 90 degrees Celsius - Answer 90 degrees Celsius 2. How do you know you have the proper suction of your vacuum? The black hose collapses There is a "breeze" over the fluid in the flask There is no movement over the fluid in the flask When the vacuum line is fully open Ask your TA - A...

1. Why is recrystallization important? Your TA says so It allows the removal of impurities Because this is the way to make product impure It causes the solid to become super white That is what the instructions say - Answer It allows the removal of impurities 2. Indicate the correct sequence of steps of recrystallization: Select solvent, dissolve solute, decolorize solution, crystallize the solute, collect and wash crystals, and dry product. Crystallize the solute, col...

1. After cooling the recrystallized sample to room temperature, what should you do next? Put it in an ice bath to maximize the yield Nothing, it should have recrystallized Scratch it with the spatula to maximize the yield Stir it with a wooden stick to maximize the yield - Answer Put it in an ice bath to maximize the yield 2. For how long do you keep the tablets in the boiling 95% Ethanol? Until the TA says "STOP!" Until the wooden stick catches on fire Until the...

after cooling the recrystallized sample to room temperature, what should you do next? - Answer put it in an ice bath to maximize the yield for how long do you keep the tablets in the boiling 95% ethanol? - Answer until the tablets disintegrate how do you know when the vacuum line is opened to the correct position? - Answer so that the liquid is filtered leaving a slight breeze over the filtrate for how long do you vacuum filtrate your sample? - Answer 5-6 minutes...

what is the definition of extraction - Answer the separation of a substance from one phase by another phase what is the most common type of extraction used in an organic lab - Answer liquid-liquid phase how likely is it to achieve 100% separation with one single extraction - Answer very unlikely to achieve better liquid-liquid phase extraction, one must: - Answer perform sequential small washes with the solvent the equipment most commonly used to carry out an ...

You will also calibrate your thermometer by performing: Reflux of alcohol Heavy drinking of alcohol Fractional distillation of alcohol Simple distillation of alcohol - Answer Simple distillation of alcohol When calibrating the thermometers of the Melteps, a "slow run" is done by increasing the temperature: With 20 C/min With 1 C/min With 10 C/min With 5 C/min - Answer With 1 C/min If you do not see the scale on the syringe wall very well: Throw the syringe in the...