Ngee Ann Secondary SchoolScience Department

• Students are required to wear safety goggles when Students are required to wear safety goggles when heating and mixing substances.heating and mixing substances.

• Avoid loose garments. (eg: ties)Avoid loose garments. (eg: ties)

• Avoid long, loose hair styles.Avoid long, loose hair styles.

• When bunsen burners are in use, long hair When bunsen burners are in use, long hair sometimes catches fire.sometimes catches fire.

• Protective gloves and clothing must be worn when Protective gloves and clothing must be worn when handling hazardous materials.handling hazardous materials.

Safety in the Laboratory…Safety in the Laboratory… “Are you ready for the laboratory?”“Are you ready for the laboratory?”Safety in the Laboratory…Safety in the Laboratory… “Are you ready for the laboratory?”“Are you ready for the laboratory?”

• Students must not enter or work in laboratories Students must not enter or work in laboratories unless a teacher is present.unless a teacher is present.

• No unauthorised experiments. Apparatus or No unauthorised experiments. Apparatus or chemicals are not allowed out of the laboratory chemicals are not allowed out of the laboratory without the permission of a teacher.without the permission of a teacher.

• Laboratory storerooms and preparation rooms are Laboratory storerooms and preparation rooms are out of bound to all students. out of bound to all students.

• Eating and drinking are prohibited in laboratories.Eating and drinking are prohibited in laboratories.

• Students should always work thoughtfully and Students should always work thoughtfully and purposefully. Practical jokes and other acts of purposefully. Practical jokes and other acts of carelessness are strictly prohibited.carelessness are strictly prohibited.

Safety in the Laboratory…Safety in the Laboratory… “Are you breaking any laboratory rules?”“Are you breaking any laboratory rules?”Safety in the Laboratory…Safety in the Laboratory… “Are you breaking any laboratory rules?”“Are you breaking any laboratory rules?”

Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”

Testing of OdoursTesting of Odours

• Do not smell the flask directly.Do not smell the flask directly.

• If you must smell the odour, carefully waft the odour If you must smell the odour, carefully waft the odour from the flask toward your nose with your hand.from the flask toward your nose with your hand.

Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”

Heating of Test TubesHeating of Test Tubes

• Keep the flask a distance from your face.Keep the flask a distance from your face.

• Make sure that the test tubes are NOT directed toward Make sure that the test tubes are NOT directed toward yourself or your classmates.yourself or your classmates.

Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”

Chemicals (eg: Acids and Water)Chemicals (eg: Acids and Water)

• Do not add water to concentrated acid.Do not add water to concentrated acid.

• The heat generated may cause splattering.The heat generated may cause splattering.

• If it is necessary to prepare certain solutions, add If it is necessary to prepare certain solutions, add acid to water instead.acid to water instead.

• Always wear eye protection.Always wear eye protection.

• Chemicals or other materials must never be tasted Chemicals or other materials must never be tasted unless specifically directed by the teacher.unless specifically directed by the teacher.

Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”

Use of the Fume HoodUse of the Fume Hood

• Use the fume hood for reactions that give off vapours.Use the fume hood for reactions that give off vapours.

• The draft of the hood will sweep away vapors so that The draft of the hood will sweep away vapors so that the laboratory maintains a reasonable air quality.the laboratory maintains a reasonable air quality.

Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”

OthersOthers

• Unlabelled chemicals should not be used. Unlabelled Unlabelled chemicals should not be used. Unlabelled containers should be reported to the teacher.containers should be reported to the teacher.

• Students should seek clarification from the teacher if Students should seek clarification from the teacher if instructions for an experiment are not thoroughly instructions for an experiment are not thoroughly understood. Students should not proceed with an understood. Students should not proceed with an experiment if in doubt.experiment if in doubt.

• Electrical wirings must be kept away from naked Electrical wirings must be kept away from naked flames and heaters. Areas around electrical flames and heaters. Areas around electrical equipment should be kept dry and where appropriate, equipment should be kept dry and where appropriate, kept far from water.kept far from water.

Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”Safety in the Laboratory…Safety in the Laboratory… “Are you aware of the proper laboratory conduct?”“Are you aware of the proper laboratory conduct?”

OthersOthers

• Equipment used to handle or transfer hazardous Equipment used to handle or transfer hazardous materials must be inspected for leaks, cracks and materials must be inspected for leaks, cracks and other forms of damage before use.other forms of damage before use.

• Pipetting should always be carried out using a pipette Pipetting should always be carried out using a pipette aid and never by mouth.aid and never by mouth.

• Sharps (such as needles, razors or pins) should not Sharps (such as needles, razors or pins) should not be discarded in waste-bins or trash bags. Instead, a be discarded in waste-bins or trash bags. Instead, a sturdy container should be used for sharp waste sturdy container should be used for sharp waste objects.objects.

Safety in the Laboratory…Safety in the Laboratory… “What do you do if something is broken?”“What do you do if something is broken?”Safety in the Laboratory…Safety in the Laboratory… “What do you do if something is broken?”“What do you do if something is broken?”

• Damaged equipment, breakages, accidents and Damaged equipment, breakages, accidents and spillage should be immediately reported to your spillage should be immediately reported to your teacher.teacher.

• Sweep away the broken glass using a broom and a Sweep away the broken glass using a broom and a dustpan.dustpan.

• Place the broken glass in a container designated for Place the broken glass in a container designated for sharp objects.sharp objects.

Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”

Common Safety Equipment in the LaboratoryCommon Safety Equipment in the Laboratory

Fire ExtinguisherFire Extinguisher

There are two main types of fire extinguishers:There are two main types of fire extinguishers:

• Carbon dioxideCarbon dioxide

• Dry chemical (powder)Dry chemical (powder)

Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”

Common Safety Equipment in the LaboratoryCommon Safety Equipment in the Laboratory

Fire BlanketFire Blanket

• Remove the blanket from the container.Remove the blanket from the container.

• Wrap it around the victim to put out the fire.Wrap it around the victim to put out the fire.

Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”

Common Safety Equipment in the LaboratoryCommon Safety Equipment in the Laboratory

Eye-wash ApparatusEye-wash Apparatus

• If an object gets in your eye, remove it from your eye If an object gets in your eye, remove it from your eye immediately.immediately.

• Run fresh water over your eye for several minutes.Run fresh water over your eye for several minutes.

Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”

Common Safety Equipment in the LaboratoryCommon Safety Equipment in the Laboratory

First Aid KitFirst Aid Kit

• Items in the kit may be used temporarily for small Items in the kit may be used temporarily for small injuries.injuries.

Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”

Common Safety Equipment in the LaboratoryCommon Safety Equipment in the Laboratory

Safety ShowerSafety Shower

• Position yourself (or your laboratory partner) under Position yourself (or your laboratory partner) under the safety shower.the safety shower.

• Pull the handle to release the flow of water.Pull the handle to release the flow of water.

• Flames will be rapidly extinguished.Flames will be rapidly extinguished.

Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”Safety in the Laboratory…Safety in the Laboratory… “Do you know what to do in case of an emergency?”“Do you know what to do in case of an emergency?”

Common Safety Equipment in the LaboratoryCommon Safety Equipment in the Laboratory

Sand BucketSand Bucket

• They are often kept next to ovens, barbecues, and They are often kept next to ovens, barbecues, and other areas where fires can occur. Oil fires are other areas where fires can occur. Oil fires are resistant to water, a fire sand bucket is used.resistant to water, a fire sand bucket is used.

Safety in the Laboratory…Safety in the Laboratory… “Are you ready to leave the laboratory?”“Are you ready to leave the laboratory?”Safety in the Laboratory…Safety in the Laboratory… “Are you ready to leave the laboratory?”“Are you ready to leave the laboratory?”

• Throw all used solutions into the sink, unless Throw all used solutions into the sink, unless otherwise stated by your teachers.otherwise stated by your teachers.

• All solid waste should be thrown in a dustbin.All solid waste should be thrown in a dustbin.

• Wash all apparatus and return them to their original Wash all apparatus and return them to their original locations.locations.

• Always wash your hands thoroughly before and after Always wash your hands thoroughly before and after every practical lesson.every practical lesson.