# CHEMISTRY Lab Skills

 The flashcards below were created by user Natalie on FreezingBlue Flashcards. What are the standard units for length, mass, time, volume, and amount? length - metermass - kilogramtime - secondvolume - literamount - mole What are the base unit abbreviations for meter, gram, second, liter, and mole? meter - mgram - gsecond - sliter - Lmole - mol King Henry died by drinking chocolate milk? Hilo Hecto Deka Base Deci Centi Milli WhHow much is in a mole? 6.02 x 1025 What is the relationship between 1 mL and cms? 1 mL = 1 cm3 What is accuracy? How close a measurement is to the true value What is precision? How close repeated measurements are to each other What is percent error? A measure of accuracyabs(O-T)/T x 100%O is the obersved valueO should be an average of several trialsT is the true value What is the percent error for high, acceptable, low and poor accuracies? High < or = 5%Acceptable 5% < PE < or = 10%Low > 10%Poor > 15% What is standard deviation? A measure of precsion-Low values are good-Units are the same as the data What is relative deviation? (SD/Average)100-Low values are good-Unit is % What is an error in reading a scale due to incorrect eye positioning? Parallax What does more digits imply for a reading? A finer calibrated scale(Less digits implies a coarser calibrated scale) What is density? p= m/V-units are g/cm3 or g/mL Where should you read a measurement of a liquid? At the bottom of the meniscus What kind of device can be used to measure many volumes? A graduated device What kind of device can measure just one volume? A volumetric device When pouring liquids, what does TC mean? To contain-Shake out remaining substance When pouring liquids, what does TD mean? To deliver- Do not shake out remaining substance AuthorNatalie ID7130 Card SetCHEMISTRY Lab Skills Descriptionlab skills Updated2010-02-17T03:30:19Z Show Answers