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Flashcards in Chapter 2 Deck (20)
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1

absorption

Occurs when a substance is taken up inside another.

2

acid wash

Procedure in which glassware is soaked in 3-6 M HCl for >1 h (followed by rinsing well with distilled water and soaking in distilled water) to remove traces of cations adsorbed on the surface of the glass and to replace them with H+.

3

adsorption

Occurs when a substance becomes attached to the surface of another substance.

4

ash-less filter paper

Specially treated paper that leaves a negligible residue after ignition. It is used for gravimetric analysis.

5

buoyancy

Upward force exerted on an object in a liquid or gaseous fluid. An object weighed in air appears lighter than its actual mass by an amount equal to the mass of air that it displaces.

6

buret

A calibrated glass tube with a stopcock at the bottom. Used to deliver known volumes of liquid.

7

calibration

Process of relating the actual physical quantity(such as mass, volume, force, or electric current) to the quantity indicated on the scale of an instrument.

8

desiccant

A drying agent.

9

desiccator

A sealed chamber in which samples can be dried in the presence of a desiccant or by vacuum pumping or both.

10

filtrate

Liquid that passes through a filter.

11

green chemistry

Principles intended to change our behavior in a manner that will help sustain the habitability of Earth. Green chemistry seeks to design chemical products and processes to reduce the use of resources and energy and the generation of hazardous waste.

12

hygroscopic

Readily picks up water from the atmosphere.

13

ignition

The heating to high temperature of some gravimetric precipitates to convert them into a known, constant composition that can be weighed.

14

meniscus

Curved surface of a liquid.

15

mother liquor

Solution from which a substance has crystallized or precipitated.

16

parallax

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.

17

pipet

A glass tube calibrated to deliver a fixed or variable volume of liquid.

18

slurry

A suspension of a solid in a solvent.

19

tare

As a noun, tare is the mass of an empty vessel used to receive a substance to be weighed. As a verb, tare means setting the balance reading to 0 when an empty vessel or weighing paper is placed on the pan.

20

volumetric flask

One having a tall, thin neck with a calibration mark. When the liquid level is at the calibration mark, the flask contains its specified volume of liquid at a specified temperature.