CHEM 234 Safety

How should acetone, ethyl acetate, or petroleum ether be disposed of?

adding it to non-chlorinated solvents waste bottle

How should you dispose of 10 mL of dilute acetic acid solution?

flush it down the sink with plenty of water

What sized glassware needs to be enclosed in tape, plastic mesh, or plastic coating to retain fragments in case of implosion when subjected to a vacuum?

greater/equal to 1 L

Chlorinated waste container is only for:

organic halogenated compounds (ie. chlorinated, brominated, iodinated)

drying ovens for apparatus should normally be vented so that?

solvent used for rinsing does not form an explosive mixture

What should you do if acetic acid, HCl or NaOH solutions enter the eye?

Immediately irrigate eye wash with water from eye wash station for at least 10 minutes, followed by check-up/treatment at the hospital

How should benzoyl chloride, chloroform, or dichloromethane be disposed of?

add it to chlorinated solvents waste bottle

small ammonia spills

are a serious safety hazard

Hot flasks should not be stoppered because:

as they cool, the pressure inside will fall, and the stopper may become stuck in the neck or even break the flask.

mutagens:

chemicals that cause a change in the genetic material of people

teratogens:

chemicals that cause birth defects or death to fetuses

carcinogens

chemicals that cause cancer

lachrymators

chemicals that cause pain to the respiratory tract, nose and eyes, leading to crying, sneezing, coughing and even blindness in high doses

Which of the following chemicals constitutes the greatest safety risk during normal use?

concentrated sulfuric acid

What chemicals should be handled with gloves?

dichloromethane, concentrated HCl, diethylamine, concentrated NaOH

Which of the following commonly used solvents has an auto-ignition temperature low enough to allow it to be ignited by a hot plate?

diethyl ether

Which of the following chemicals are considered to pose fire hazards in normal use?

diethyl ether, ethanol, acetone, ethyl acetate

How should sodium hydrogen carbonate be disposed of?

down the sink

When using concentrated hydrochloric acid, gloves should always be worn, as this chemical is corrosive and causes chemical burns to the skin. Another hazard associated with the use of this chemical is it:

gives off hydrogen chloride, a toxic and corrosive gas

The auto-ignition temperature of a substance is:

higher than the flash point temperature which vapor can spontaneously ignite without a source of ignition, such as a spark

The correct and safest way to attach a filler bulb to a graduated pipet is to:

hold the pipet above the glass bulb, close to the end, and ease it into the filler bulb sufficiently to make a seal.

How should copper sulfate be disposed of?

into a special container

Which of the following are hazards associated with dichloromethane?

limited evidence of a carcinogenic effect, harmful by inhalation, it can dissolve some of the fatty tissues in the skin with prolonged contact - causing chemical burns

Flammable liquids will often have a stated flash point. What is a flash point?

lowest temperature which liquid has sufficient vapor pressure to ignite when in the presence of an ignition source

Flammable liquids will often have a stated auto-ignition temperature. What is meant by auto-ignition temperature?

minimum temperature which liquid-vapor mixture will ignite without an ignition source

How should you dispose of 200 mL of dilute NaOH?

neutralize it with an acid, then flush it down the sink with plenty of water

How should you dispose of 5 mL of concentrated HCl?

neutralize it with an alkali (like NaOH), then dispose the solution using an acid waste container

How should you dispose of 500 mL of dilute HCl?

neutralize it with an alkali (like NaOH), then flush it down the sink with plenty of water

exposure to following compounds may impair fertility:

pyridine, benzene

Which of the following chemicals is particularly expensive and should be disposed of in a special residues container?

silver nitrate

When dissolving sodium hydroxide pellets in water, what should you do to prevent hot-spots from forming?

swirl constantly

the fire alarm goes off while you are running reflux using an electric hot plate. what should you do?

turn off heat, but leave the stirrer on and water flowing the condenser. then, leave the lab

volatile

vaporizes easily

If concentrated hydrochloric acid is spilt onto your skin, you should:

wash it off with plenty of water from tap

What situations is it imperative to wear gloves in the laboratory?

- handling strong oxidizing agents, such as potassium permanganate - handling known/suspected carcinogens, like benzene - handling concentrated acids and bases -handling glass wool