CHEM TECH REVIEWER

Question 1

Among the estimated 100,000 chemicals used in the workplace today, how many are considered hazardous?

Answer 1

About 60,000

Question 2

Any substance that has the ability to damage, alter, or interfere with human metabolic systems

Answer 2

Toxic chemical

Question 3

Four primary routes by which substances can enter the body

Answer 3

inhalation, absorption, ingestion and injection

Question 4

True or false: Toxic and poison are synonymous

Answer 4

Tru

Question 5

Corrective action for minor liquid chemical spills:

Answer 5

Absorb material, place in compatible container and make ready for appropriate disposal and report the event

Question 6

Corrective action for Strong Acid spills

Answer 6

Follow instructions in MSDS, or dust area with solid sodium bicarbonate (baking soda), sweep up, place in a suitable container and report the event

Question 7

Corrective action for strong base spills

Answer 7

Follow MSDS or dust area with solid boric acid, place in a suitable container and report event

Question 8

Corrective action for large chemical spills

Answer 8

Contain spill immediately only if it is safe to do so, evacuate the immediate area, keep out, warn others and notify emergency services

Question 9

Lethal dosage of table salt for rats

Answer 9

About 1 gram

Question 10

Standardized expression of toxicity

Answer 10

LD50

Question 11

What does LD50 represent?

Answer 11

The quantity or dose of toxic material necessary to cause death in 50 percent of the test animals

Question 12

LD50 or toxicity of mercury

Answer 12

50 mg/kg

Question 13

Ability of a chemical to cause a harmful effect after a single exposure

Answer 13

Acute toxicity

Question 14

They established guidelines to protect workers from overexposure to potentially hazardous chemicals

Answer 14

OSHA and American Conference of Governmental Industrial Hygienisr

Question 15

Average concentration for a normal 8-hour workday or 40-hour workweek to which nearly all workers may be repeatedly exposed, day after day, without adverse effects

Answer 15

Time-Weighted Average

Question 16

maximum concentration to which workers can be exposed for a period of up to 15 minutes continuously without suffering from irritation, chronic or irreversible tissue change, narcosis

Answer 16

Short term exposure limit

Question 17

defined as the concentration that should not be exceeded even instantaneously

Answer 17

Ceiling (C)

Question 18

Constitutes an atmosphere that poses an immediate hazard to life or produces immediate irreversible health effects

Answer 18

Immediately Dangeroud to life or health

Question 19

Oxygen deficient atmosphere

Answer 19

Atmosphere of less than 19.5% oxygen by volume measured at sea level

Question 20

Indicates that precautions should be taken to prevent exposure through the skin

Answer 20

skin notation

Question 21

Commonly accepted ventilation rate in processing areas

Answer 21

10 to 15 air changes per hour

Question 22

Ventilation rate in laboratories

Answer 22

8 to 12 air changes per hour

Question 23

Accepted ventilation rate in mechanical/service and utility rooms

Answer 23

6 to 10 Air changes per hour

Question 24

Indicates the prevailing wind direction

Answer 24

Wind socks

Question 25

Hierarchy of control

Answer 25

1 Elimination
2 Substitution
3 Engineering controls
4 Administrative control
5 Personal protective equipment

Question 26

This type of control includes barriers , shields, local exhaust ventilation system etc

Answer 26

Engineering controls

Question 27

Refers to clothing, eyewear, gloves, helmets, footwear or other garments that provide protection to the wearer from bodily injury

Answer 27

PPE

Question 28

What causes drift errors in analytical balance?

Answer 28

• balance door is open
• balance is not levelled
• air currents are present in the lab

Question 29

A document that provides useful information on the chemical hazards, advice on safe handling, use and storage and the emergency measures. It contains 16 headings

Answer 29

Safety Data Sheet

Question 30

Type of chemical that can cause allergic reaction in the airways following inhalation of the chemical

Answer 30

Respiratory Sensitizer

Question 31

Ammonia solution can be stored with ______

Answer 31

• NaOH solution
• 2-propanol soln
• cyclohexane soln

EXCEPT
acetic acid sold

Question 32

First consideration for chemical storage shall be based on_____

Answer 32

compatability with other chemicals