Safety Rules General Guidelines Clothing Accidents and Injuries Handling Chemicals Handling Glassware and Equipment Heating Substances

General Guidelines Conduct yourself responsibly Follow instructions carefully Never work alone Do not touch anything until instructed to No food, drink or gum in lab Unauthorized experiments are prohibited Come prepared to lab Observe good housekeeping practices Keep aisles clear Know what to do during a fire drill Handle sharp objects carefully

General Guidelines, cont’d Know location and operation of safety equipment Always work in a well-ventilated area Be alert and cautious at all times Dispose of chemical waste properly Read labels carefully Keep hands away from face, eyes, mouth and body while using chemicals/specimens Stay at your own lab station Stay out of storage room

A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to Aneutralize the acid that is reacting to produce the noxious fumes Bcarry the reactants outside, away from other students Cleave the room and go to an area with fresh air Dspray the reaction with a fire extinguisher

Which safety precautions are not being followed?

Why is safety important?

True or False _____1.Practical jokes are permitted in the laboratory. _____2.Some equipment and materials used in the laboratory may hurt you if not used correctly. Why not? What does that imply? In other words, what should you not do?

Clothing Always wear goggles when using glassware, heat or chemicals Do not wear contact lenses No baggy clothes, dangling jewelry, or open toed shoes; tie hair back Wear lab aprons when appropriate

Handling Chemicals Do not touch, taste or smell chemicals; waft Check label on chemical bottles twice Never return unused chemicals to bottle Never mouth-pipette Be very careful when transferring chemicals Always add acid to water (triple A rule) Handle hazardous liquids over a pan to contain spills Never remove chemicals from the lab Handle all chemicals with care, esp. to move

The safest way to dilute concentrated sulfuric acid is to add- Aa series of small volumes of water to the acid while stirring Bthe acid to water slowly while stirring constantly Cthe acid to a small volume of water and then add more water Ddilute sulfuric acid to a small volume of concentrated acid Why add it slowly? Why stir it?

What is wrong with this picture? What changes would you make to this procedure?

What is wrong with the procedure being used by this student?

Does wafting have anything to do with bad measurements? Paraphrase this answer. Do you ever smell chemicals directly? Why not?

_____4.Always add acid to water, never water to acid. Why is this important?

Handling Glassware, Equipment Carry long glass items vertically Never handle broken glass with bare hands Always lubricate before inserting glass into rubber stoppers Fill wash bottles with correct fluid Unplug plugs by the plug; must be dry Never used cracked or dirty glassware Report damaged electrical equipment immediately Do not use it if you don’t know how Do not dip hot glassware in cold water

_____5.Chipped glassware may be used with the teacher’s permission. _____7.Put broken glass in the special container, not in the trash. Why should a student never use chipped glassware? Why should we avoid placing sharp objects into the trash can?

Heating Substances Be careful around Bunsen burners Never leave a burner unattended Always point open end of heated tube away from anyone else Let things cool after heating Never look into a container when heating Place hot items on heat pad Be careful when heating glass to bend it

What alternative procedure would you suggest?

Predict the outcome of this procedure. What is a good alternative?

Which procedures are not being followed?

_____3.Long hair should be tied backwhenever using burners or hot plates. Why?