labratory equipment

Question 1

What is a beaker? (def)

Answer 1

A wide open container with a flat bottom (made out of glass or plastic)

Question 2

What is a beaker used for?

Answer 2

Used to mix, heat, or hold substances

Question 3

What does a graduated beaker do

Answer 3

Give approximate measurements of liquid volumes

Question 4

The top rim of a beaker has a ____ and a ____ indentation that allows liquids to be easily poured from it

Answer 4

lip

curved

Question 5

What is a flask? (definition)

Answer 5

a glass container with a thin neck and a rounded base

Question 6

What are flasks used for?

Answer 6

To measure, heat, or store liquids

Question 7

What does the neck of the flask allow?

Answer 7

Clamps to be attatched or stoppers to be placed

Question 8

List the three different types of flask

Answer 8

• erlenmeyer flask
• florence flask
• volumetric flask

Question 9

Describe an erlenmeyer flask (3)

Answer 9

• cone shaped base
• often used during filtration/titration
• wide bottom allows liquids to be heated quickly

Question 10

which type of flask is often used in the processes of filtration and titration?
(process where solid particles removed from fluid by filter medium/process where a solution with a known ratio of parts is used to determine how much of a part there is in another solution)

Answer 10

Erlenmeyer flask

Question 11

describe a florence flask (3)

Answer 11

• round/spherish flask with a rounded or flat base.
• liquid contained heats evenly due to shape
• stronger than other flasks.

Question 12

Which flask is used to boil liquids for distillation (liquid vaporized then condensed for separation) processes and can handle extreme temps/temp changes?

Answer 12

florence flask

Question 13

Describe a volumetric flask (3)

Answer 13

• pear shaped/raindrop base, long neck
• usually with a stopper
• always marked to hold a specific amount, and only that amount

Question 14

Which flask is used to accurately measure liquids to a fixed volume or to create solutions with fixed volumes?

Answer 14

Volumetric flask

Question 15

What is a test tube? (definition)

Answer 15

A cylinder glass tube with a rounded bottom

Question 16

What is a test tube used for?

Answer 16

Holding or heating small amounts of a substance

Question 17

How is a test tube held?

Answer 17

Held upright using clamps or test tube holders

Question 18

What is a buret/burette?

Answer 18

long glass cylinder used to measure and dispence an amount of liquid

Question 19

What does a burette look like?

Answer 19

Cylinder open at top, bottom comes together into tip. Stopcock valve attatched to bottom, above tip, which regulates amount of liquid flowing

Question 20

Burettes are often used for _____ with an Erlenmeyer flask below the tip of the buret,

Answer 20

titrations

Question 21

What is a graduated cylinder?

Answer 21

A tall cylinder used to measure volume of a liquid

Question 22

Volume of a liquid in a graduated cylinder is measured from the _____

Answer 22

bottom of the meniscus

Question 23

What is a meniscus?

Answer 23

An inward curve at a liquid’ surface

Question 24

What are graduated cylinders often used to measure besides liquids?

Answer 24

The volume of an irregular solid (through displacement)

Question 25

Mass is measured by devices known as _____

Answer 25

balances

Question 26

What do balances do?

Answer 26

measure mass by comparing the unknown mass of an object to the known mass of another object

Question 27

How does a triple beam balance measure mass?

Answer 27

compares an object's mass to the mass of predetermined weights (riders)

Question 28

The triple beam balance has a pan connected to ___ beams marked with certain measurements, each carrying a different ____ (____) with a known mass. On the other end of the beams is a __, which shows when the device is balanced

Answer 28

three riders pre-determined weight pointer

Question 29

To measure the mass of the object on the pan (triple beam balance), predetermined weights moved across beam until pointer shows that ____. _______ on all 3 beam balances is the mass

Answer 29

the riders and the object on the pan are balanced Total sum of the values the riders stopped at

Question 30

What is an analytical balance?

Answer 30

A single pan balance that is electronic. pan enclosed within deice.

Question 31

How is mass measured in an analytical balance?

Answer 31

Empty container mass measured, then mass of substance in container measure. Mass together - empty container mass = mass of substance.

Question 32

What is the tare and tare weight?

Answer 32

Tare = mass of empty container | tare weight = weight of empty container

Question 33

What is taring?

Answer 33

Taring is when the mass of a substance is measured by substracting the mass of the container from the mass of both the container and substance

Question 34

What is a thermometer (if you don't get this right, so help me-)

Answer 34

thin graduated glass tube used to measure temperature. | -bulb on one end that holds a fluid that expands when heated.

Question 35

Markings on thermometer generally dictated by two reference points, the ___ and ____

Answer 35

freezing point of water | boiling point of water

Question 36

What do digital thermostats measure temp using? What does that thing have?

Answer 36

Thermistors, which contain a semiconductor substance (conducts electric current well at high but not low temps). Microchip measures how much electrical current. converts into temp movement

Question 37

What device is used to measure the pressure of a fluid?

Answer 37

Manometer

Question 38

Manometers are usually used to measure pressures close to _____

Answer 38

atmospheric pressure

Question 39

How do manometers measure pressure? What is Po? What is Pa? What is H?

Answer 39

Based on the height difference between the liquid in two legs of the "U" shape. The two different legs are hooked up to two different pressure sources. - Po is the reference pressure (pressure in the leg exposed to atmosphere) - Pa is the test pressure, or the pressure of the leg where the pressure you are testing is. - H is the difference between Po and Pa

Question 40

What is a barometer?

Answer 40

A type of manometer used to measure atmospheric pressure

Question 41

Mercury barometers are often used in ____

Answer 41

weather reporting

Question 42

Most pressure gauges today are ____. They have a _____, which ____ when pressure increases, and turns a pointer as it ____.

Answer 42

Aneroid (without fluid) coiled tube (bourdon tube) contracts like a spring coils and uncoils

Question 43

Who developed the first mercury barometer? What unit of pressure is named after them?

Answer 43

Evangelista Torricelli the Torr

Question 44

What is a pipette?

Answer 44

A device used to measure liquids and move them between containers

Question 45

How is a liquid drawn into a pipette?

Answer 45

Suction as a vacuum is created within the pipette

Question 46

Name the two different kinds of pipette

Answer 46

Pasteur pipette and volumetric pipette.

Question 47

What is a Pasteur pipette? Is it accurate?

Answer 47

A long skinny tube with a bulb at one end (looks like an eye dropper). Does not do accurate measurements

Question 48

What is a volumetric pipette? Is it accurate? Do they come in different sizes

Answer 48

A long skinny tube with a wider bit in the middle and a suction thing at an end. Accurately measure a specific volume of liquid. Come in different sizes

Question 49

What is a bunsen burner?

Answer 49

A gas burner with a single steady flame

Question 50

Where does the flame burn on a bunsen burner?

Answer 50

Above a vertical metal tube connected to a gas source

Question 51

What is the "collar" on a bunsen burner?

Answer 51

The collar controls the amount of air that mies with fuel, and as such, affects the quality of the flame. Can be rotated to change amount of air.

Question 52

What is the "valve" on a bunsen burner?

Answer 52

A valve controls the amount of air that flows into the bunsen burner

Question 53

How are the collar and valve of a bunsen burner in relation to each other (physically)?

Answer 53

The valve is slightly beneath (?) the collar. The valve looks like a long screw while the collar looks like a tube of metal

Question 54

What is a crucible? (def)

Answer 54

A special high temp porcelain container used to melt metals, to dry powders, or accomplish other high temp tasks

Question 55

What are tongs used for?

Answer 55

To hold onto hot containers and crucibles

Question 56

What is a stopper? (definition)

Answer 56

A rub top that fits into a flask or test tube. | Sometimes closed and other times have small holes for fitting into other equipment

Question 57

What is a funnel? (definition)

Answer 57

Cone shaped objects with stems. | Used to pour liquids from one container to another

Question 58

What is a burette stand?

Answer 58

A stand that holds a burette in place with a clamp

Question 59

What is a ring stand?

Answer 59

A circle of metal attached to a stand that can hold beakers or flasks in the air when supported by wire gauze or a clay triangle.

Question 60

What is a hot plate?

Answer 60

A device for heating things without an open flame | controlled by a dial

Question 61

What is a double pan balance?

Answer 61

A device used to compare the weights of two different objects