Chemistry Laboratory Techniques

Question 1

No eating or ___ in lab

Answer 1

drinking

Question 2

Personal ___ involves the consistent use of safety goggles, a laboratory coat or apron, and closed-toed shoes in any laboratory environment

Answer 2

safety

Question 3

Volatile or dangerous ___ should be handled in a hood, and a face mask or respirator may be needed as well

Answer 3

chemicals

Question 4

All laboratories should have an eyewash station and shower station for rapid response to spills that ___ the eyes or skin

Answer 4

contact

Question 5

Disposal of ___ waste should be done safely and appropriately, and containers should be set up for different types of waste

Answer 5

laboratory

Question 6

Of the containers for waste, these include disposal ___ for solvents and excess chemicals, biohazards, and broken glassware

Answer 6

containers

Question 7

___ refers to a measurement giving the actual value for the sample with a limited deviation

Answer 7

accuracy

Question 8

___ is the repeatability of a set of measurements on the same sample

Answer 8

precision

Question 9

___ and precision are determined by a combination of using the correct laboratory apparatus and using that apparatus properly

Answer 9

accuracy

Question 10

Equipment that is calibrated generally has an acceptable temperature ___ and is specifically calibrated at one temperature (usually 25 degrees Celsius).

Answer 10

range

Question 11

Glass is generally preferred for ___ applications because of its strength, inertness, transparency, and heat resistance

Answer 11

chemistry

Question 12

Plasticware also has the ___ of being lightweight and difficult to break

Answer 12

benefit

Question 13

Before using plasticware or rubber, check that no ___ solvents will be used because components of the plastic can leach into organic solvents and contaminate the experiment

Answer 13

organic

Question 14

A large number of items in the laboratory are ___ because they are simply used for containing, mixing, and reacting without specifically measuring the experimental materials

Answer 14

uncalibrated

Question 15

Non-calibrated glassware includes: ___, beakers, Erlenmeyer flasks, round-bottomed flasks, transfer (or Pasteur) pipets, watch glasses, bottles, jars and vials

Answer 15

test tubes

Question 16

Test tubes are relatively ___ and allow a large number of samples to be arrayed in a rack for easy processing

Answer 16

small

Question 17

___ are wide-mouthed cylinders with a lip to allow pouring

Answer 17

beakers

Question 18

___ are tapered and therefore minimize accidental spills

Answer 18

erlenmeyer flasks

Question 19

___ are used for reaction, heating, or vacuum applications

Answer 19

round-bottom flasks

Question 20

A ___ is a round vacuum flask with a long neck that extends to the side

Answer 20

retort

Question 21

An ___, also known as a separatory funnel, is a teardrop-shaped flask with a ground glass stopper at the top and a stopcock at the bottom

Answer 21

extraction flask

Question 22

___ are often made of plastic and have an integral bulb at the top

Answer 22

transfer pipets

Question 23

___ are made of glass with a long tapered tip and require a separate rubber pipet bulb

Answer 23

pasteur pipet

Question 24

Bottles are ___ with narrow openings generally used to store reagents or samples

Answer 24

containers

Question 25

Small ___ are called vials

Answer 25

bottles

Question 26

___ are cylindrical containers with wide openings that may be sealed

Answer 26

jars

Question 27

___ are used to contain vacuums

Answer 27

bell jars

Question 28

Watch glasses, also known as evaporating dishes, are shallow ___ used as evaporating surfaces or to cover beakers

Answer 28

glass plates

Question 29

Calibrated glassware should be used for any laboratory ___ that requires accuracy and precision

Answer 29

measurement

Question 30

A ___ is a tall, narrow tube with volume markings increasing from bottom to top and a lip at the top for pouring

Answer 30

graduated cylinder

Question 31

The ___ can be either concave or convex depending on the liquid being measured

Answer 31

liquid

Question 32

No matter the shape of the ___, volume is always read at the meniscus in the middle of the cylinder

Answer 32

meniscus

Question 33

A ___ is a long tube that is clamped in place vertically with a stopcock at the bottom

Answer 33

buret

Question 34

Burets are especially useful when ___ are to be dispensed slowly or dropwise

Answer 34

liquids

Question 35

A ___ is hand-held and controlled by a pipet bulb that maintains slight vacuum at the top of the pipet

Answer 35

graduated pipet

Question 36

___ have a large bulge in the middle of the bulge and deliver a single established volume of liquid with great accuracy and precision

Answer 36

volumetric pipet

Question 37

A ___ is used to make solutions that require a specific volume of liquid, such as molar solutions

Answer 37

volumetric flask

Question 38

The ___ is an important piece of measurement equipment consisting of a glass probe and an electronic meter

Answer 38

ph meter

Question 39

A ___ determines the acidity or basicity of a solution by comparing the voltage (electric potential) produced by the solution compared to the voltage of a known standard solution and uses the difference in voltage (the potential difference) between them to calculate the pH

Answer 39

pH meter

Question 40

___ can also be used to quickly determine pH, although it is less accurate than a pH meter

Answer 40

litmus paper

Question 41

___ (also called top-loading balances) are used when weights are in the milligram range and require accuracy to within plus or minus 0.5 mg

Answer 41

standard laboratory balances

Question 42

Analytical balances have glass sides and sliding doors to protect against slight movements due to ___ and must be used with particular care

Answer 42

analytical balances

Question 43

___ is a way for chemists to measure the energy content of a substance

Answer 43

calorimetry

Question 44

In a simple ___, the fuel (the sample being measured) is ignited, heating up the surrounding air. That air heats surrounding water. Using the specific heat of the water, it is possible to measure the heat content and thereby calculate the internal energy of the sample

Answer 44

bomb calorimeter