Lab Safety and Equipment

Lab Safety and Equipment

Middle School

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Learning Objectives

• Identify and follow general lab safety rules and procedures.

• Describe the correct response to accidents and emergencies in the lab.

• Identify common lab equipment and explain their functions.

• Recognize and understand the meaning of common lab safety symbols.

Key Vocabulary

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Wafting chemicals

To gently wave or move air, especially to safely smell a chemical from a distance.

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Meniscus

The curve seen at the top of a liquid used for an accurate volume measurement.

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SDS

Safety Data Sheets provide information needed for safely using various chemicals in the laboratory.

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Beaker

A container used to measure, heat, mix, and pour large amounts of various liquids.

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Graduated Cylinder

A narrow cylinder used for accurately measuring the volume of liquids with high precision.

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General Lab Safety Rules

• Always follow all written and verbal instructions from the teacher.

• Act responsibly in the lab; no horseplay, pranks, or running.

• You must wear closed-toe shoes and tie back any long hair.

• Do not eat or drink in the lab; wash your hands afterward.

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Multiple Choice

Which of the following is a key part of dressing appropriately and safely for a lab?

• Keeping long hair down

• Having loose sleeves for flexibility

• Wearing sandals for comfort

• Wearing closed-toe shoes

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Handling Materials Safely

• Never taste or smell chemicals; waft fumes and check the SDS binder.

• Use tongs for hot items and point heated test tubes away from others.

• Handle sharp tools with care, cut away from your body, and don't run.

• Keep electrical equipment away from liquids and do not use frayed cords.

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Multiple Choice

What is the proper procedure for smelling a chemical in the lab?

• Taking a big sniff directly from the container

• Gently wafting the odor toward your nose

• Mixing it with water first

• Heating the chemical to make it stronger

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Accidents and Emergencies

• Immediately report any accident, injury, spill, or broken equipment to your teacher.

• Know the locations of the fire extinguisher, eyewash station, fire blanket, and shower.

• Do not touch broken glass; for eye splashes, use the eyewash for 20 minutes.

• Use the lab shower for large spills on clothing or a fire blanket for fire.

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Multiple Choice

If a chemical accidentally splashes into a student's eyes, what is the first and most important action to take?

• Find the SDS binder for information

• Rub the eyes vigorously

• Immediately lead them to the eyewash station to flush their eyes

• Wait for the teacher to notice the problem

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Equipment for Measuring

• A beaker is a wide container for mixing and pouring large liquid volumes.

• ​A graduated cylinder is more accurate than a beaker for measuring liquid volume.

• Always read the liquid measurement from the bottom of the meniscus.

• A dropper or pipette helps in transferring or measuring small amounts of liquids.

• A triple beam balance is a tool to precisely measure an object’s mass.

• A thermometer is an instrument for measuring temperature, usually in degrees Celsius.

Multiple Choice

Which piece of equipment is best suited for accurately measuring 25 mL of water?

• Erlenmeyer Flask

• Test Tube

• Beaker

• Graduated Cylinder

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Equipment for Holding, Storing & Other Tools

• An Erlenmeyer flask holds liquids; its narrow neck helps prevent any splashing.

• A test tube holds small substances, and a rack holds multiple tubes.

• A funnel is a tool used to transfer substances without spilling them.

• Tongs grasp items; a microscope magnifies objects and is carried with two hands.

Multiple Choice

A student needs to hold five different liquid samples in small amounts for observation. What piece of equipment would be most appropriate for this task?

• An Erlenmeyer flask

• A graduated cylinder

• A large beaker

• A set of test tubes in a rack

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Safety Equipment and Symbols

Protective Equipment

• Safety goggles must be worn to protect your eyes from chemicals, heat, and sharp objects.

• A lab coat or an apron is used to protect your body and clothing from spills.

• This gear is called Personal Protective Equipment, or PPE, and is essential for lab safety.

Safety Symbols

• The biohazard symbol indicates a substance that can transmit or cause a disease.

• The eye hazard symbol is a warning that you must wear eye protection.

• A toxic or poison symbol means a substance is poisonous and dangerous if swallowed or inhaled.

Multiple Choice

You see a container marked with the Eye Hazard symbol. What does this tell you?

• The substance is a danger to the eyes and requires safety goggles.

• The substance should be viewed with a microscope.

• The substance is safe to look at.

• The substance will change color.

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Common Lab Safety Misconceptions

Misconception	Correction
It's okay to smell chemicals directly from the container.	Always waft chemicals by waving the fumes gently toward your nose.
Safety goggles are only needed when working with liquids.	Goggles are required when using chemicals, heat, or sharp objects.
You should immediately clean up any broken glassware by yourself.	Never touch broken glass. Tell your teacher right away for cleanup.
It is okay to do your own experiments with extra time.	Always get your teacher's permission before starting any experiment.

Multiple Choice

Why is it safer to heat a substance in a test tube pointed away from people, and which tool should be used to hold it?

• To see the reaction better; your hands

• To cool it down faster; forceps

• To concentrate the heat; a test tube rack

• To prevent splashes from hitting anyone; tongs

Multiple Choice

How should a student's approach to handling a bottle of chemicals differ from their approach to handling an electrical microscope?

• They should waft the microscope and carry the chemical bottle with two hands.

• They should read the SDS for the chemical and ensure the microscope has no frayed cords and is away from liquids.

• They should wear goggles for both but only worry about spills with the microscope.

• There is no difference in how you should handle lab equipment.

Multiple Choice

A lab procedure requires a student to measure 50 mL of a liquid, heat it, and then pour it into a flask. Analyze this process and determine the correct sequence of equipment use.

• Use a test tube to measure, heat it on a triple beam balance, and pour it into a graduated cylinder.

• Use a graduated cylinder to measure, pour it into a beaker to heat, then use a funnel to pour it into an Erlenmeyer flask.

• Use a beaker to measure, heat it in the beaker, then pour into a test tube.

• Use a pipette to measure, heat it in a Florence flask, then pour it into a beaker.

Multiple Choice

A student enters the lab and sees a beaker of clear liquid on the desk. Without any instructions, what are the potential hazards, and what is the single most important rule to follow?

• The beaker might be fragile; the most important rule is to put on a lab coat.

• The liquid might be water, so it is safe to touch; the most important rule is to clean the area.

• There are no hazards if the liquid is clear; the most important rule is to tie back your hair.

• The liquid could be a harmful chemical or hot; the most important rule is to wait for instructions before touching anything.

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Summary

• Always follow all safety rules and directions from your teacher.

• Know the location and use of all emergency equipment.

• Properly handle materials like chemicals, hot objects, and sharp instruments.

• Recognize safety symbols and keep your workspace clean and organized.

Poll

On a scale of 1-4, how confident are you about lab safety and using equipment correctly?

• 1

• 2

• 3

• 4