1
Volumetric pipettes have one calibration mark only-true or false?
True
---------------helps focus light on the same plane as the slide
Condenser
Serological pipettes have 2 calibration marks -- 2 rings indicating what?
The two calibrating marks indicate that Blow‑out is required: The pipette is calibrated “To Deliver” (TD) its total volume only if you blow out the last bit of liquid remaining in the tip.
What material is used for the manufacture of most laboratory glassware
Borosilicate glass
What type of calibration involves weighing the amount of liquid delivered by a pipette
Gravimetric
Formula to calculate total magnification is ?
Magnification of objective X Oculars
What water purification method exchanges H+ ions
Cationic exchanger
How long do you have to wait for before centrifuging a yellow top SST?
30 min
Best way to increase RCF?
Increase the speed
The smallest amount that can be weighed describes what
Sensitivity of balance
When does empty magnification exist?
When Total magnification > usable magnification.
--------------is used for cleaning the site of venipuncture when blood alcohol level is requested.
Chlorhexidine.
What does matching the numerical aperture of the illumination system with the objective lens provide?
Provides better image resolution and contrast
This type of centrifuge separates lipids from plasma (chylomicrons)
Ultracentrifuge
List the advantages of a dry bath over a water bath
–Tubes don’t get wet
–Less maintenance
–More compact design
What is the name of the error that occurs when the eye is not on the same plane as the meniscus?
Parallax error
What step does the automatic tare eliminate?
The need to weigh the device that you will be weighing your solute in.
Which grade of chemical is the highest purity?
–Analytical reagent grade (AR)
Speed of centrifuge is calibrated using this
Tachometer
What happens if your eye is above the miniscus?
–Less volume is actually delivered
What allows for the individual adjustment of focus for each eye
Diopter
A workplace label is not required if an MSDS sheet is available--True or false?
False
A dessicant can protect contents from moisture indefinitely-- True or false
False
Petri dishes are made of polystyrene---True or false
True
Sodium hydroxide reacts with glass and must be stored in what type of container?
Polyethylene