Transcript SCIENCE SAFETY

 Before we learn how to extinguish fires, we first need
to know a little about how they work.
 The fire triangle to the right shows
the three things that must be
present at the same time in order
for a fire to occur.
 Take any of these away and
the fire will be extinguished!
Not all fires are the same.
We classify fires based on
the type of fuel they
burn.
If you use a fire
extinguisher on the
wrong type of fire you
can in fact make it worse!
Most extinguishers have a
label showing which fires
they can fight.
The extinguisher in our room is a
Dry Chemical Extinguisher used
to fight A, B and C fires.
These are filled with a fine yellow
powder and pressurized with
nitrogen.
Read the label carefully before
using to ensure it can put out the
type of fire you are fighting!
These extinguishers put out fires by
coating the fuel with a fine layer
of dust, separating the fuel from
the oxygen in the air.
They also interrupt the chemical
reaction of the fire, so they are
extremely effective!
1) Assist any person in immediate danger to safety if it
poses no danger to yourself
2) Activate the building fire alarm or call 911.
3) Only after you have done these two things should you
attempt to fight the fire if :
• You know what is burning (Remember you could make it
worse by say throwing water on an electrical or oil fire).
• The fire is no bigger than a kitchen garbage can. Bigger
fires can spread much faster than you could anticipate.
• You have an escape route that isn’t blocked.
ALWAYS KEEP AN EXIT TO YOUR BACK!!!!
It's easy to remember how to use a fire extinguisher if
you can remember the acronym PASS, which stands
for:
Pull
Aim
Squeeze
Sweep
Pull the pin.
This will allow
you to
discharge the
extinguisher.
Aim at the base of the
fire. If you aim at the
flames (which is
frequently the
temptation), the
extinguishing agent will
fly right through and do
no good. You want to hit
the fuel.
Squeeze the top
handle or lever.
This depresses a
button that releases
the pressurized
extinguishing agent
in the extinguisher.
Sweep from side to
side until the fire is
completely out. Start
using the extinguisher
from a safe distance
away, then move forward.
Once the fire is out, keep an
eye on the area in case it reignites.
Remember!!!!
Never use a water extinguisher to put
out any type of fire except type A.
Using one on an electrical fire could
electrocute you!
Using one on a flammable liquid fire
(like gas) will be ineffective and could
make it worse.
 Know where exits are: in the front or back of
the room, depending on which chemistry room
you are in.
 Exits should always be kept clear. Backpacks
should stay under desks to prevent tripping
and injury if we have to evacuate quickly!
 Never stick anything in the outlets- it can
remain stuck and cost A LOT of $ to remove.
 Outlets are off if the valves are perpendicular
(at a right angle) to the nozzle.
ON
OFF
 Make sure they are off before you touch.
 Most injuries occur because the plate is
hot even after it is turned off.
still
Don’t complete the circuit!
Don’t be a pathway to the ground.
Grounding pins in the plug, help
ground the wire and protect against
dangerous current.
1) Always pour acids into water.
 If anything splashes out it will most likely be water.
 Pouring water into acid can create an exothermic
reaction that explodes!
2) Always wear goggles when working with chemicals.
3) Never smell a chemical directly. Waft it with you hand
to your nose.
Eyewash
•If a chemical gets into your eyes, don’t
notify me first- GO DIRECTLY TO THE
EYEWASH!
•Wash eyes for at least 15 minutes, even if
there is no pain or irritation.
Contacts
•Contacts can pose a greater risk of eye
injury when working with chemicals.
•Some chemicals will literally melt the
contact to your eye.
•It is strongly recommended (but not
required) that you wear glasses and not
contacts during a chemistry lab.
Fume Hood
•In the back of the room.
•Sucks air out to prevent
dangerous vapors from
getting into the lab space.
•Anything in the hood
should only be touched
with explicit instruction!
Safety Shower
•This you must ask me to use
first, unless I’m not around.
•If you spill dangerous
chemicals onto yourself, you
will need to remove the clothes
and stand under the shower
until I say it is ok (probably 15
minutes).
•Don’t worry everyone will
leave the room, and you’ll be
given a new set of clothes.
First Aid Kit
•Currently in a drawer
behind the projector screen
(will be on the wall soon)
•Depending on the chemistry
room, it could be in the prep
room. TAKE NOTE
•If I’m not around, feel free
to get out and use if
necessary.
 Available online at http://www.flinnsci.com/msds-
search
 You will need to fill out a table for all chemicals we use
in each lab.
 The higher the number, the more hazardous a
chemical is in that category. (a 2 for flammability is
more flammable than a 0)
 Make sure all valves are closed before you begin.
 Open valve at lab bench ¾ open.
 Open gas valve on burner slightly, then light burner
with a striker (a 45° angle works well)
 Adjust air valve on burner to obtain a steady blue
flame with a small blue cone in the middle.
 When you are finished, turn gas off at the lab bench!