Chemistry lab manual class 12 pdf download

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Honors Chemistry, and AP Chemistry. Podcasts or Vodcasts in your classroom? Things you need to know about using fire extinguishers in a chemistry laboratory. Which kind of extinguisher should I use?

This document was originally designed to focus on fire situations in chemistry laboratories. While it continues to mention laboratories, the information contained herein is broadly applicable to almost all workplaces. Fire is the most common serious hazard that one faces in a typical chemistry laboratory. This document teaches you the basics about fire extinguishers – proper types, how to use them, when and when not to use them as well as the proper procedures to follow should a fire occur. STOP, DROP and ROLL on the ground to extinguish the flames.

If one of your coworkers catches fire and runs down the hallway in panic, tackle them and extinguish their clothing. If you have a water-filled extinguisher in your laboratory, have it replaced immediately by contacting your campus or corporate Fire Marshal’s office. If you are not familiar with fire extinguishers and have not been trained in their use, DO NOT attempt to use them! Water can be a dangerous extinguishing medium for class C fires because of the risk of electrical shock unless a specialized water mist extinguisher is used. This class was added to the NFPA portable extinguishers Standard 10 in 1998. June 30, 1998 are “grandfathered” into the standard.

Halotron and those hard-to-find Class D models. Everything from small hand-held units to large wheeled units and fixed distribution systems. If you need 1 extinguisher or 1,000 we can meet your needs! Some fires may be a combination of these! Your fire extinguishers should have ABC ratings on them.

UL Standard 711 and look something like “3-A:40-B:C”. Higher numbers mean more firefighting power. In this example, the extinguisher has a good firefighting capacity for Class A, B and C fires. B, C and D fires such as burning liquids, electrical fires or reactive metal fires. In these cases, the flames will be spread or the hazard made greater!

They also make a terrible mess – but if the choice is a fire or a mess, take the mess! MRI scanners, and scientific instruments. Proper planning can avoid situations where you might have to make a choice between extinguisher types. It takes effective training to recognize if your computer or airplane is fully engulfed in flames or a person is in danger, then possible added damage from an ABC extinguisher is moot, but using one on pool chemicals is likely to increase the peril. They don’t work very well on class A fires because the material usually reignites.