LAB SAFTEY and Equipment How to be safe and smart in a lab setting
Why be Safe? • In groups of two, write down three reasons to be safe in the lab.
Proper Dress • Always wear safety goggles • Do not wear open-toe shoes • Shoes must completely cover the foot • Remove jewelry from hands and wrists
Proper Dress • Tie back long hair • Do not use flammable hair products just prior to lab
Food Rules • Absolutely no food or drink in the lab! • Do not eat or drink anything we make in lab (even if it is edible) • Waft things to smell them
How to Act • Absolutely, positively, NO HORSEPLAY!!
Safety Equipment • Know where the following items are: • Fire Extinguisher • Safety Shower • First-Aid Kit • Eye Wash
Accident Procedures • Notify the teacher immediately of any accident! • Do not clean up spills unless directed to do so! • Do not pick up broken glass!
Clean Up • Turn off all burners, gas valves, and water facets • Unplug any electrical device • Clean your area as directed by the teacher • Only dispose of wastes as directed by the teacher • DO NOT POUR LIQUIDS IN THE SINK UNLESS TOLD TO DO SO!!!!
Safety Symbols • Safety symbols are used to indicate possible hazards • Become familiar with the safety symbols on page xxxi of your text
Data Collection • Accuracy refers to how close a measurement is to the real value or accepted value • Precision refers to how close a series of measurements are to one another. • Errors can affect both accuracy and precision. • All experiments should undergo error analysis • Did I take more than one reading? • Did I use the equipment properly? • Was I objective, or did I make the results turn out as I expected they might?
Reading a Graduated Cylinder • Graduated cylinders are used to accurately measure volume of a liquid. • Liquids form a meniscus, or curve, when placed in a graduated cylinder. • Always read the volume from the bottom of the curve.