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SCIENCE SAFETY

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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 ... – PowerPoint PPT presentation

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Title: SCIENCE SAFETY


1
SCIENCE SAFETY
2
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!

3
Fire Safety
  • 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.

4
Fire Safety
  • 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!

5
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 isnt blocked.
  • ALWAYS KEEP AN EXIT TO YOUR BACK!!!!

6
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

7
Fire Safety- How to use an extinguisher

Pull the pin. This will allow you to discharge
the extinguisher.
8
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.

9
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.
10
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 re-ignites.
11
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.
12
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13
Exits
  • 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!

14
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
15
Hot Plates
  • Make sure they are off before you touch.
  • Most injuries occur because the plate is still
    hot even after it is turned off.

16
Electrical Safety
  • Dont complete the circuit!
  • Dont be a pathway to the ground.
  • Grounding pins in the plug, help
  • ground the wire and protect against
  • dangerous current.

17
Chemical Safety
  • 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.

18
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19
  • Eyewash
  • If a chemical gets into your eyes, dont notify
    me first- GO DIRECTLY TO THE EYEWASH!
  • Wash eyes for at least 15 minutes, even if there
    is no pain or irritation.

20
  • 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.

21
  • 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!

22
  • Safety Shower
  • This you must ask me to use first, unless Im 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).
  • Dont worry everyone will leave the room, and
    youll be given a new set of clothes.

23
  • 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 Im not around, feel free to get out and use
    if necessary.

24
MSDS Material Safety Data Sheets
  • Available online at http//www.flinnsci.com/msds-s
    earch
  • 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)

    Substance   Hazard Ratings 0 none 4 extreme Hazard Ratings 0 none 4 extreme Hazard Ratings 0 none 4 extreme
    Substance   Health Flammability Reactivity
       
       
       
       
25
Bunsen Burners
  • 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!
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