Title: Ch. 7.1.4 Safety Quiz
Course: Lab Safety > Section: Day 5

Based on the section 7.1.4 Chemical hoods in introduction laboratories from the book Laboratory Safety for Chemistry Students by Hill and Finster, 2010 by John Wiley and Sons

Q: What is true about breathing chemicals in a laboratory?
- Many liquids have large-enough vapor pressure to product gases.
- If you can smell a chemical, then you are inhaling the chemical.
- Most chemicals used in labs are probably safe to breathe.
- Both (a) and (b).
A: Both (a) and (b).

Q: Chemical hoods are
- requred in all labs that use liquids and solutions
- required in all labs that use any chemical that is harmful to breath
- required only in industrial chemistry lab
- not required per se in labs, but are used as a means of achieving a safet environment for breathing
A: not required per se in labs, but are used as a means of achieving a safet environment for breathing

Q: Which of the following are good features of a chemical hood?

Select all that apply.
- a sash that can be partially raised for access to the interior
- a sash that can be removed when necessary to make interior access easier
- access to utilities such as water, vacuum, and natural gas
- an on/off switch
A: a sash that can be partially raised for access to the interior; access to utilities such as water, vacuum, and natural gas; an on/off switch

Q: The best chemical hoods
- are on at "full volume air flow" at all times to ensure maximum safety
- adjust the rate of air flow to keep the lab environment safe while minimizing energy use
- have on/off switches so that air flow can be turned off when the hood is not being used
- automatically shut down if the air pressure in the hood gets too high
A: adjust the rate of air flow to keep the lab environment safe while minimizing energy use

Q: Before using a chemical hood, one should
- momentarily turn it off, then on again
- test for airflow
- lower the sash completely
- check to make sure all of the untilities, such as water and vacuum, work
A: test for airflow

Q: Test for airflow
- should be conducted annually
- should be conducted with the sash completely lowered
- can only be conducted when the hood is completely empty
- (a) and (b)
A: (a) and (b)

Q: The sash of a chemical hood should generally be left
- open so that experiments can be monitored more carefully
- open so that the maximum amount of air can flow through the hood
- closed except when the chemist needs access to the inteior of the hood
- closed except when the hood is off
A: closed except when the chemist needs access to the inteior of the hood

Q: Chemical hoods should
- not be used for storage since this limits the ability to use them for experiments
- not be used for starage since this inhibits good airflow
- be used for storage when there is no other place to store lab chemicals
- both (a) and (b)
A: both (a) and (b)

Q: Equipment placed inside a chemical hood:

Select all that apply.
- should be placed as close to the front of the hood as possible for easy access
- should be placed at least 6 inches inside the front ot the hood
- should always be placed flat on the bench inside the hood
- should be placed on 2" blocks, if possible, to prevent inhibiting air flow
A: should be placed at least 6 inches inside the front ot the hood; should be placed on 2" blocks, if possible, to prevent inhibiting air flow