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Laboratory
Midterm Exam
11
Chemistry
Undergraduate 1
02/27/2010

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Cards

Term
buret
Definition
a calibrated glass tube with a stopcock at the bottom, used to deliver known volumes of liquid
Term
desiccant
Definition
a drying agent
Term
desiccator
Definition
a sealed chamber in which samples can be dried in the presence of a desiccant or by vacuum pumping or both
Term
direct weighing
Definition
Term
hygroscopic
Definition
substance that readily picks up water from the atmosphere
Term
indirect weighing
Definition
Term
meniscus
Definition
the curved surface of a liquid
Term
pipet
Definition
a glass tube calibrated to deliver a fixed or variable volume of liquid
Term
tare
Definition
(n) the mass of an empty vessel used to receive a substance to be weighed (v) setting the balance reading to 0 when an empty vessel or weighing paper is placed on the pan
Term
volumetric flask
Definition
flask with a tall, thin neck with a calibration mark
Term
parallax error
Definition
the apparent displacement of an object when the observer changes position. occurs when the scale of an instrument is viewed from a position that is not perpendicular to the scale. the apparent reading is not the true reading
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