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 studentsbegin to feel nauseated and dizzy. The first response should be to

A neutralize the acid that is reacting to produce thenoxious fumes

B carry the reactants outside, away from other students

C leave the room and go to an area with fresh air

D spray 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 laboratorymay 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-

A a series of small volumes of water to the acid whilestirring

B the acid to water slowly while stirring constantly

C the acid to a small volume of water and thenadd more water

D dilute 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 procedurebeing 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?