LABORATORY GLASSWARE & PLASTICWARE

Question 1

Nowadays, the use of plastic equipments are rampant, however plastics tend to have limitations

Limitations=________

That’s why we still continue to use glasswares

Answer 1

can’t support heat

Question 2

PURPOSE OF GLASSWARES AND PLASTICWARES IN THE LABORATORY

Answer 2

Storage
Measurment
Containment

Question 3

– if you want to store something for a longer period of time
Specific qualities; has the ability to withstand:
Extreme temperature, and;
Corrosive effects of strong acids and strong alkaline solutions

Answer 3

Storage

Question 4

– if you want to find out the volume of a certain fluid, specially if it is involved in a certain experiment or activity
Measuring liquids (graduated cylinders, volumetric flask, Pasteur pipette)

Answer 4

Measurement

Question 5

– no need for measurement, just something where you can put the fluid in while waiting for it to be used in an experiment
Where we place TEMPORARILY our chemicals and reagents (test tubes, wash bottles)

Answer 5

Containment

Question 6

PLASTICWARE

Advantages

Answer 6

Cheaper
More durable
Preferred for some analyses

Example: testing for heavy metals (NO glass)

Some heavy metals that we need to analyze could also be present in glasswares, and they could be considered as a contaminant

Question 7

PLASTICWARE

Disadvantages

Answer 7

Evaporation through breathing of the plastic

Evaporation of dyes, stains, proteins

Note: plastic is porous, allowing evaporation to take place between pores

Question 8

GLASSWARE

Advantages

Answer 8

(Some) heating
Not all glasswares are used for heating
(Graduated cylinder, Volumetric flask)

Longer storage of some chemicals

Question 9

GLASSWARE

Disadvantages

Answer 9

May SHATTER

Question 10

NIST

Answer 10

(National Institute of Standards And Technology)

Question 11

2 types of glassware according to precision and tolerance

Answer 11

Class A Glassware
Class B Glassware

Question 12

It is the _____ that tells us whether a glass is of class A or B

Answer 12

National Institute of Standards and Technology (NIST)

Question 13

In Laboratory applications, ____ glasswares are more recommended by the NIST

Answer 13

class A

Question 14

Glassware:

Higher accuracy in measurement
More expensive

Answer 14

Class A

Question 15

Generally have twice the tolerance limit

Answer 15

Class B

Question 16

More durable
For general purpose work

Answer 16

Class B

Question 17

Calibrated to a lower level of accuracy

Answer 17

Class B

Question 18

Higher accuracy in thermal capacity

Answer 18

Class B

Question 19

Those in direct contact with biohazard material is usually_____

Answer 19

disposable

Question 20

If not disposable, follow proper_______ protocol

Answer 20

decontamination

Question 21

Enumerate the 7 types of plasticwares in chronological order

Answer 21

PETE
HDPE
PVC
LDPE
PP
PS
Others

Question 22

1

Answer 22

PET or PETE (polyethylene terephthalate)

Question 23

2

Answer 23

HDPE (high density polyethylene)

Question 24

3

Answer 24

PVC (polyvinyl chloride)

Question 25

4

Answer 25

LDPE (low density polyethylene)

Question 26

5

Answer 26

PP (polypropylene)

Question 27

6

Answer 27

PS (polystyrene)

Question 28

7

Answer 28

Other, or more than one resin used

Question 29

– Soft drink, water, catsup, salad dressing bottles, and others

Answer 29

PET or PETE (polyethylene terephthalate)

Question 30

– Milk, water, juice, shampoo, detergent bottles

Answer 30

HDPE (high density polyethylene)

Question 31

– Plastic film wrap, clear food and non-food packaging including some juice bottles.

Answer 31

PVC (polyvinyl chloride)

Question 32

– Dry cleaning bags, squeezable bottle like mustard.

Answer 32

LDPE (low density polyethylene)

Question 33

– Catsup bottles, yogurt containers and margarine tubes, medicine bottles

Answer 33

PP (polypropylene)

Question 34

– Plastic to-go containers, Styrofoam, CD Jackets

Answer 34

PS (polystyrene)

Question 35

Safest plastic wares

Answer 35

1 Polyethylene terephthalate
2 High Density Polyethylene
4 Low Density Polyethylene
5 Polypropylene

Question 36

Toxic plasticwares

Answer 36

3 Polyvinyl Chloride
6 Polysterene
7 Others/ more than one resin used

Question 37

95% of all plastic products are positive for______ activity

Answer 37

estrogenic

Question 38

Plastics contain chemicals that can disrupt______ and can cause adverse effects “PLASTIC IS NOT FRIENDLY”

Answer 38

hormones

Question 39

MAJOR TYPES OF RESIN USED IN CLIN. CHEM LAB

Answer 39

Polystyrene
Polyethylene
Polypropylene
Teflon
Polycarbonate

Question 40

_____ are considered to be contaminants for the analysis of heavy metals

Answer 40

Glassware