Glasswares

Question 1

The most commonly used type of glass used

Answer 1

Borosilicate

Question 2

Why is Borosilicate the most commonly used type of glass used

Answer 2

• naturally transparent
• can withstand high heats and thermal shock

Question 3

What type of glass does Borosilicate contain

Answer 3

boron trioxide

Question 4

advantages of using Borosilicate glass

Answer 4

o Can withstand high temperatures easily
o Inert to almost all chemicals
o Can withstand high agitation & thermal stress
o Extremely low coefficient of expansion
o Corrosion-resistant

Question 5

Other term for Quartz Glass

Answer 5

Fused Silica

Question 6

most uncompromising equipment found in a laboratory

Answer 6

Silica glass

Question 7

How is Quartz Glass created

Answer 7

created at high temperatures of 2,000C by melting sand.

Question 8

Silica glass is chemically _____ and _______ with the reagent it holds. This gives you _______ and ______ results of your experiment

Answer 8

pure
does not react
clear and concise

Question 9

reasons why you should include silica/quartz glass in your lab equipment list

Answer 9

o High thermal shock resistance
o Superior to borosilicate
o Extremely Pure material
o Chemically Inert
o Splendid Optical Transmission (unique characteristic that differs from other glass)

Question 10

glass equipment that is tinted dark brown or amber to protect light-sensitive chemical compounds from getting altered by i______________, v___________ and u____________

Answer 10

infrared radiation, visible light and ultraviolet radiation.

Question 10

glass equipment that is tinted dark brown or amber.

Answer 10

ACTINIC GLASS

Question 11

benefits of using actinic glass:

Answer 11

o Light sensitive (unique characteristic that differs from other glass)
o Inert to chemicals
o Store compounds safely
o Experiments sensitive to UV radiation

Question 12

This glass is extremely fragile and has a low melting point. It is almost impossible to repair and does not have high thermal shock resistance.

Answer 12

SODA LIME GLASS

Question 13

properties of soda lime glass that makes it useful in laboratories

Answer 13

o Chemically stable
o Highly Inert
o Extremely Workable
o Affordable

Question 14

These are simple cylindrical containers, in sizes from ___ ml to _____ ml. One of the commonest glass equipment found in labs, they are used for holding solids and liquids, and for pouring and decanting liquids.

Answer 14

Beakers
10 ml to 4000 ml.

Question 15

Uses of Beakers

Answer 15

• For preparation of solution/reagents.
• Transferring liquid to another container
• transfer a small amount of reagent for use in procedures.

Question 16

Used when you want to swirl contents without spilling. They are fitted with stoppers.

Answer 16

CONICAL FLASKS/ERLENMEYER

Question 17

what is the difference between an erlenmeyer and florence flask

Answer 17

An Erlenmeyer flask has a flat bottom, so used for direct heating while a Florence flask can have either a round or a flat bottom and can be used for direct heating as well with a heating mantle (placed under Erlenmeyer flask).

Question 18

Uses of Erlenmeyer

Answer 18

• For performing titrations
• for boiling the solutions, since evaporation is minimum because of the conical shape.
• These are also suitable for storage of liquids

Question 19

This is flat-bottomed pear-shaped vessel with long narrow necks and Specific volume mark, fitted with stopper

Answer 19

VOLUMETRIC FLASKS

Question 20

Volumeteric Flask Uses

Answer 20

• To precisely measure one specific volume of liquid.
• Used to prepare a solution of known concentration.

Question 21

Uniform thickness and withstand mechanical and thermal shock

Answer 21

TEST TUBES

Question 22

Uses of Test Tubes

Answer 22

• used to store, mix and heat chemicals
• useful in observational procedures (like urinalysis or determination of carbohydrates in biochemistry).

Question 23

This is straight long cylindrical tube with graduations on its side.

Answer 23

GRADUATED CYLINDER

Question 24

They are generally more accurate and precise for measuring volume than flasks, but it is a semi-accurate liquid measuring vessels because of their wide bore.

Answer 24

GRADUATED CYLINDER

Question 25

Use of Graduated Cylinder

Answer 25

For rapid measurement of liquid volume.

Question 26

How to read volume in graduated cylinder if: - clear liquid - turbid liquid

Answer 26

- lower meniscus - upper meniscus

Question 27

Differentiate the 3 types of glass pipettes o Mohr o Volumetric o Serological

Answer 27

o Mohr – measuring pipette o Volumetric – has valve in the middle; usually 10 ml o Serological – measuring pipette; graduation is extend up to the tip

Question 28

Has rubber bulb attached to the top of the glass tubing, tapered at the tip.

Answer 28

PASTEUR PIPETTE

Question 29

use for pasteur pipette

Answer 29

Uses: (1) Used in qualitative determinations, where few drops of specimen is added in reagent. (2) Used in separation of serum and plasma from cells.

Question 30

uses of funnel

Answer 30

Uses: (1) These are used for pouring liquids, chemicals or solutions into container. (2) Separation of solids from liquids. (3) Separation of liquids from liquids.

Question 31

Are devices used typically in analytical, quantitative chemistry applications for measuring liquid solution.

Answer 31

BURETTE

Question 32

This is a glass container which is used when the volume of liquid is small, but you need a higher surface area. It is good for crystallizing and evaporation and can also be used as a beaker.

Answer 32

WATCH GLASS

Question 33

Absorb moisture from a substance.

Answer 33

DESICCATORS

Question 34

They perform the same task as desiccator. The _________ is a more direct way of removing moisture.

Answer 34

DRYING PISTOLS

Question 35

Small bottles that are used for storage.

Answer 35

VIALS

Question 36

a piece of laboratory glassware used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities.

Answer 36

SEPARATORY FUNNEL

Question 37

other terms for SEPARATORY FUNNEL

Answer 37

separation funnel, separating funnel, or colloquially sep funnel

Question 38

an apparatus or item of equipment used to change the physical state of a substance from its gaseous to its liquid state.

Answer 38

GLASS CONDENSER

Question 39

used in procedures involving organic liquids brought into the gaseous state through heating, with or without lowering the pressure applying vacuum)-though applications in inorganic and other chemistry areas exist.

Answer 39

GLASS CONDENSER