Is a beaker TD or TC?
Is a beaker TD or TC?
Calibrated pipets, burets, syringes and droppers are T.D. glassware; volumetric flasks and cylindrical or conical graduates are T.C. Erlenmeyer flasks, beakers, and prescription bottles, regardless of markings, are NOT volumetric glassware, but are simply containers for storing and mixing liquids.
What does TD mean on a pipette?
to deliver
Why are pipettes more accurate?
Volumetric pipets are so accurate because the long neck decreases the error in measuring volume of the meniscus. Graduated cylinders are designed for accurate measurements of liquids with a much smaller error than beakers.
Where should you dispose of broken glass quizlet?
Only discard broken glass in the broken glass box. Either in biohazard, sharps, broken glass boxes, pathological waste, or liquid waste.
Why is it bad to pour chemicals down the drain?
Disposing of chemicals down drains can damage your plumbing which can be expensive to repair and also allow those chemicals a direct path into the groundwater. Improperly disposing of chemicals at your site can lead to environmental contamination of your site which can be time consuming and expensive to clean up.
Why should you not use glassware that you know is not totally clean?
Likewise, presence of impurities in glass labware can distort the meniscus and can prevent one from getting the correct results out of the science lab experiment. Keeping the laboratory glassware physically neat and clean, free of grease, and bacteria is therefore of the utmost importance.
How should you pick up a piece of hot glassware?
Heating: Use a clamp or tongs to pick up hot glassware. Do not touch hot objects with your bare hands.
Does hot glass look the same as?
Hot glass looks the same as cold glass.
What is the best use for a fume hood?
Purpose. Chemical fume hoods, when used properly, are one of the most reliable engineering controls in the laboratory. They protect workers by: Containing vapors, dusts, gases, and fumes generated within the hood, and removing them as air flows into the hood and then out via the laboratory exhaust system.
How should a fume hood be left when not in use?
Fume hoods are designed so that when they are not in use the sash should be shut. There is an airfoil sill at the bottom of the sash in all modern fume hoods so that even when the sash is shut, air will still be pulled from the room to exhaust any hazardous vapors.
When using a fume hood Why is it a bad idea to open the front all the way?
Chemicals in the front of the hood are not captured efficiently and can escape into the room. You should keep chemicals at least 6 inches back from the edge of the air foil sill.
Where do fume hoods vent to?
A fume hood is a ventilated enclosure in which gases, vapors and fumes are contained. An exhaust fan situated on the top of the laboratory building pulls air and airborne contaminants through connected ductwork and exhausts them to the atmosphere.
How high should you keep the fume hood sash while using it?
sixteen inches
Why should you not open laboratory windows?
Proximity to Windows and Doors. Exterior windows with movable sashes are not recommended in laboratories. Wind blowing through the windows and high-velocity vortices caused when doors open can strip contaminants out of the chemical hoods and interfere with laboratory static pressure controls.
Is a biological safety cabinet a fume hood?
A chemical fume hood is designed to remove chemical fumes and aerosols from the work area while a biosafety cabinet is designed to provide both a clean work environment and protection for employees who create aerosols when working with infectious agents or toxins. …
What should you do every time before you leave the lab?
Before leaving the lab, you’ll need to make sure it’s thoroughly cleaned so it’s ready and safe to work in again. Make sure to clean all used glassware, return reagents to the storage area, dispose waste in the right containers and clean your workbench.