Transcript September 1

SCIENCE SAFETY NOTES
Prior to conducting any scientific investigation,
it is important to consider your safety and the
safety of those around you.
All labs require MSDS information for the
chemicals used (you will look this up online).
Most labs require additional safety
considerations or comments (e.g.: goggles
required, beware of hot glassware).
Fire 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!
Fire Safety- Rules for Fighting Fires
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.
Fire Safety- How to use an extinguisher
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
Fire Safety- How to use an extinguisher
Pull the pin.
This will allow
you to
discharge the
extinguisher.
Fire Safety- How to use an 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.
Fire Safety- How to use an extinguisher
Squeeze the top
handle or lever.
This depresses a
button that releases
the pressurized
extinguishing agent
in the extinguisher.
Fire Safety- How to use an 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.
Fire Safety- How to use an extinguisher
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.
Other Fire-related considerations…
• Stop, Drop and Roll!
• Fire blankets
• Quick release cabinets
• For smothering fire (removing oxygen
from triangle).
• Exits
–2
– Must be accessible at all times
(keep backpacks, etc, out of
the way)
• Gas Outlets
– One main shut off in front of
the room.
And while we are talking HOT…
• Can you tell if this is too hot to touch? It will stay hot
a lot longer than you might think!
• Hot Plates
– Don’t touch until completely cooled off…common
burns!
Health, Flammability, and Reactivity
Ratings range from 0-4 (it is very rare to see a 4)
0
4
 A rating of 0 means it poses a very low threat in
that category.
 A rating of 4 means it poses a VERY high threat
in that category.
 It is rare in this course to see a rating of 3, but
it does happen.
Try these out
If you saw a chemical with the following ratings,
what would you think?
Health
Flammability
Reactivity
0
1
0
What would you do to make sure you were safe
using this chemical?
Try these out
If you saw a chemical with the following ratings,
what would you think?
Health
Flammability
Reactivity
1
0
0
What would you do to make sure you were safe
using this chemical?
Try these out
If you saw a chemical with the following ratings,
what would you think?
Health
Flammability
Reactivity
0
0
1
What would you do to make sure you were safe
using this chemical?
MSDS Information
MSDS stands for Material Safety Data Sheet
(you may also see SDS for Safety Data Sheet)
You will look up MSDS information for every
chemical you use in a lab.
Before the first lab with chemicals we will
spend some time looking at MSDS sheets so
you are familiar with them.
• Acid is poured into water because…
– Risk of splashing
– Acid + water is often exothermic
(gives off heat), so adding the
reactive piece second is safest
(less likely to be explosive.
• GOGGLES!
– Worn at all times when using
hazardous chemicals and during
hazardous activities!
– Sanitized between classes.
• Eye wash
– Must be able to reach within 10 seconds
– If chemical gets into your eyes…JUST GO!
– Capable of washing both eyes at the same time
– Must be flushed 2-3 minutes/week to protect
again contamination/infection
• Must NEVER be used as a drinking fountain.
– Flushed continuously for AT LEAST 15 minutes.
• Lift eyelids away from surface of eyeball.
• Contacts pose a greater risk of eye
injury when working with chemicals.
• Chemicals can get trapped between
your contact and your eye – at best this
may increase the irritation, at worst it
may melt the contact to your eye.
• It is recommended (but not required)
that you wear glasses and not contacts
during a chemistry lab.
• For Fire and Chemical Spills
• Delivers 20 gallons of water/minute
• Contaminated clothes must be removed
immediately
– Class leaves, teacher stays, looking
away.
– Or Fire Blanket could be used for
modesty
• Lab coats/aprons are made to be taken
off…
– In case of chemical spill (or fire) that
is what should be done first.
• What is the main point of wearing safe clothes in the
lab?
– Minimizing contact between chemicals and skin!
• You need:
– Close toed shoes
– Long pants
– Shirt that covers your shoulders
– Hair, scarves, sweatshirts, jewelry removed or tied
back out of the way.
Exits
• Know where exits are: 2 in front
• Exits should always be kept clear. Backpacks
should stay under desks to prevent tripping
and injury if we have to evacuate quickly!
Gas/Air Outlets
• 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
* Gas and Air Master OFF switch is next to
whiteboard up front
Electrical Safety
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.
First Aid Kit
•Found in a Red Backpack under
the teacher demo station.
Draw a Safety Map
On the very last page of your composition book,
draw a map of the classroom (use a ruler!)
Use up the whole page.
Label the following:
- Fire extinguisher -Goggle cabinet
-Emergency gas shut off switch
- Fire blanket
-Emergency
electrical
shut
off
- Eye wash
switch
- Safety shower
-Fume hood
- Both exits
-First aid kit
Until the end of class…
Answer the safety contract questions, in your
composition book, in complete sentences.
IF THIS IS NOT COMPLETED IN CLASS, YOU MUST
FINISH IT AS HOMEWORK (ON A SEPARATE
SHEET OF PAPER)
CONTRACT, POWER POINT, AND QUESTIONS ARE
ONLINE.