What is generally the best approach when liquid from a large reagent bottle is needed in an experiment?
check and see if anyone else can use the chemical
. If not, discard in the proper waste container. A student removes a chemical sample from a reagent bottle to be used in an experiment.
When pouring from a bottle you should put your hand?
Hold coin-top stoppers between your fingers while pouring.
Hold bottles with your hand over the label
.
How do you get the liquid out of a reagent bottle?
Many solid chemicals can be easily transferred by tipping the bottle and
slowly rotating
the bottle back and forth. Don’t tip the bottle up high and let the contents pour out. If a spatula is provided at the reagent bottle, you may use it. Never use your own spatula.
How do you handle a large liquid chemical spill quizlet?
If you spill a liquid chemical, what should you do?
Report spills immediately and stay away from the chemicals while your teacher cleans them up
.
Why should you never return liquids to a stock reagent bottle?
Never return unused chemicals to the reagent bottles.
This is
a source of possible contamination of the entire contents of the stock bottle
. Dispose of unused chemicals exactly as instructed in the waste disposal instructions for that substance, identified by throughout each experiment.
Is used to dispense a very small amount of liquid?
A pipette, also known as a chemical dropper
, is a glass or plastic tube used to suction small amounts of liquid to enable to transfer the liquid from one place another. … It is used in experiments to accurately measure small quantities of liquid.
Where should you never dispose of broken glass?
Broken glass should never be handled directly and should
never be placed into the regular trash
.
What is the very first thing you should do before starting any lab exercise?
- Make sure you understand the experiment before starting an experiment. …
- Wear the right kind of clothing and gear. …
- Be aware of safety equipment and where it’s located. …
- Fill out your lab form as you conduct your experiment. …
- Complete your lab report as soon as possible after the lab.
Can you pour a glass of wine back into the bottle?
Yes, it’s OK
. But if there’s a bit of sediment left in the bottle, you might want to give it a quick rinse first, before pouring the wine back in. … Then I drain the bottle as best I can before pouring the wine back in. Funnels are extremely helpful for this.
What do you do with a thermometer once you are finished using it?
Allow
the alcohol to air-dry on the thermometer
to effectively kill germs. If desired, rinse the device under cool water to remove traces of alcohol, taking care not to wet any electronic elements, such as the display. Let the thermometer air-dry completely before using or storing.
When you spill solid chemicals on a balance?
If you spill chemicals on the top loading balance,
clean it immediately
. Keep weighing chamber and weighing pan clean. 5) Do not overload the balance.
What is considered to be a large spill?
Large Spills (
> 1 Liter or a material
presents an immediate fire, safety, environmental, or health hazard regardless of quantity). Examples: Spill of greater than 1 Liter of ethanol, methanol, strong acids or bases or any quantity of highly volatile organics, and mercury compounds.
Why do we always replace tops of reagent bottles immediately?
Always replacing bottle tops as
soon as you have finished dispensing reagents since many compounds react with moisture in the air
, with oxygen or with carbon dioxide. Others are volatile and evaporate. … If you do remove the reagent from the common work area temporarily, replace it as soon as possible.
What to do with unused reagents?
- Return any chemicals (excess reagent, product, or waste) to the appropriate location, or dispose of them as instructed;
- Clean any used glassware and return the items to the appropriate location; and.
- Wipe down the work surfaces.
What is the purpose of using a reagent bottle?
Reagent bottles, also known as media bottles or graduated bottles, are containers made of glass, plastic, borosilicate or related substances, and topped by special caps or stoppers. They are
intended to contain chemicals in liquid or powder form for laboratories and stored in cabinets or on shelves
.
What to do if hair catches on fire in lab?
Extinguish small fires in a container by covering and cutting off the oxygen with a solid ceramic matte. If anyone’s hair or clothing catches on fire, immediately try to
smother the flames with a wool fireblanket, or cotton clothing
. Do not ever try to smother flames with nylon clothing: it could melt onto the skin.
