Textbook Notes (363,103)
Canada (158,195)
Chemistry (251)
CHMB16H3 (16)
Chapter 3

CHMB16 Chapter 3

4 Pages
Unlock Document

University of Toronto Scarborough
Kagan Kerman

Chapter 2 Tools of the TradeSafe Ethical Handling of Chemicals and WasteWear goggles or safety glasses with side shields at all times in the lab to protect your eyes from liquids and glass which fly around when least expectedDo not wear contact lenses because vapors can be trapped between the lens and the eyeHandle organic solvents concentrated acids and concentrated ammonia inside a fumehoodWear a respirator when handling fine powdersTreat spills on your skin first by flooding with waterLabel all vessels to indicate what they containGreen Chemistry a set of principles intended to change our behavior to help sustain a habitable planet seeks to design chemical products and processes to reduce the use of resources and energy and the generation of hazardous waste The Lab NotebookThe lab notebook must state what was done what was observed and be understandable to someone elseUse complete sentences to prevent incomplete descriptionsPaste hard copies of important data into your notebookEach page in your notebook should be signed and datedAnalytical BalanceElectronic Balance uses electromagnetic force compensation to balance the load on the panReadability the smallest increment of mass that can be indicatedMicrobalance weighs a milligram quantity with a readability of 1microgramTare the mass of the empty vesselChemicals should never be placed directly on the weighing panHygroscopic Reagents reagents that rapidly absorb moisture from the airWeighing by Difference first weigh a capped bottle containing dry reagent then quickly pour some reagent from the weighing bottle into a received cap the weighing bottle and weigh it again and the difference is the mass of reagent delivered from the weighing bottleMechanical Balance it has two pans suspended on opposite ends of an equalarm lever balanced at its center on a knifeedgeoIt should be in its arrested position when you load or unload the pan and in the halfarrested position when you are dialing weightsSamples must be at ambient temperature to prevent errors due to convective air currentsoWarm samples might appear lighter than their actual massoCool samples might appear heavier than their actual massoThe warmth of your hand and your fingerprints can affect the apparent mass of an object so tweezers are recommendedAnalytical balances should be located on a heavy table to minimize vibrationsTolerances allowable deviations from the standardLinearity Error the maximum error that can occur as a result of nonlinear response of the system to added mass after the balance has been calibratedBuoyancy the upward force exerted on an object in a liquid or gaseous fluidoTrue mass is the mass measured in vacuum
More Less

Related notes for CHMB16H3

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.